109 results on '"Cayol, Valérie"'
Search Results
2. Co-eruptive, endogenous edifice growth, uplift during 4 years of eruption at Sangay Volcano, Ecuador
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Espín Bedón, Pedro Alejandro, Ebmeier, Susanna K., Elliott, John R., Wright, Tim J., Mothes, Patricia, Cayol, Valérie, Maghsoudi, Yasser, Lazecký, Milan, and Andrade, Daniel
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- 2024
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3. Understanding the drivers of volcano deformation through geodetic model verification and validation
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Crozier, Josh, Karlstrom, Leif, Montgomery-Brown, Emily, Angarita, Mario, Cayol, Valérie, Bato, Mary Grace, Wang, Taiyi A., Grapenthin, Ronni, Shreve, Tara, Anderson, Kyle, Astort, Ana, Bodart, Olivier, Cannavò, Flavio, Currenti, Gilda, Dabaghi, Farshid, Erickson, Brittany A., Garg, Deepak, Head, Matthew, Iozzia, Adriana, Kim, Young Cheol, Le Mével, Hélène, Novoa Lizama, Camila, Rucker, Cody, Silverii, Francesca, Trasatti, Elisa, and Zhan, Yan
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- 2023
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4. An inverse problem in an elastic domain with a crack : a fictitious domain approach
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Bodart, Oliver, Cayol, Valérie, Dabaghi, Farshid, and Koko, Jonas
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- 2022
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5. 22 years of satellite imagery reveal a major destabilization structure at Piton de la Fournaise
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Dumont, Quentin, Cayol, Valérie, Froger, Jean-Luc, and Peltier, Aline
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- 2022
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6. La surveillance de la déformation des volcans
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CAYOL, Valérie, primary, PELTIER, Aline, additional, FROGER, Jean-Luc, additional, and BEAUDUCEL, François, additional
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- 2022
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7. Fictitious Domain Method for an Inverse Problem in Volcanoes
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Bodart, Oliver, Cayol, Valérie, Dabaghi, Farshid, Koko, Jonas, Barth, Timothy J., Series Editor, Griebel, Michael, Series Editor, Keyes, David E., Series Editor, Nieminen, Risto M., Series Editor, Roose, Dirk, Series Editor, Schlick, Tamar, Series Editor, Haynes, Ronald, editor, MacLachlan, Scott, editor, Cai, Xiao-Chuan, editor, Halpern, Laurence, editor, Kim, Hyea Hyun, editor, Klawonn, Axel, editor, and Widlund, Olof, editor
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- 2020
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8. XFEM based fictitious domain method for linear elasticity model with crack
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Bodart, Olivier, Cayol, Valérie, Court, Sébastien, and Koko, Jonas
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Mathematics - Numerical Analysis ,74B05, 74S05, 65N30, 74R10 - Abstract
Reduction of computational cost of solutions is a key issue to crack identification or crack propagation problems. One of the solution is to avoid re-meshing the domain when the crack position changes or when the crack extends. To avoid re-meshing, we propose a new finite element approach for the numerical simulation of discontinuities of displacements generated by cracks inside elastic media. The approach is based on a fictitious domain method originally developed for Dirichlet conditions for the Poisson problem and for the Stokes problem, which is adapted to the Neumann boundary conditions of crack problems. The crack is represented by level-set functions. Numerical tests are made with a mixed formulation to emphasize the accuracy of the method, as well as its robustness with respect to the geometry enforced by a stabilization technique. In particular an inf-sup condition is theoretically proven for the latter. A realistic simulation with a uniformly pressurized fracture inside a volcano is given for illustrating the applicability of the method., Comment: 27 pages, 15 figures
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- 2015
9. Co-Eruptive, Endogenous Edifice Growth: Uplift During 4 Years of Eruption at Sangay Volcano, Ecuador
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Espín Bedón, Pedro Alejandro, primary, Ebmeier, Susanna, additional, Elliott, John, additional, Wright, Tim J., additional, Mothes, Patricia, additional, Cayol, Valérie, additional, Maghsoudi, Yasser, additional, Lazecky, Milan, additional, and Andrade, Daniel, additional
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- 2024
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10. Is stress modeling able to forecast intrusions and slip events at Piton de la Fournaise volcano?
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Dumont, Quentin, primary, Cayol, Valérie, additional, and Froger, Jean-Luc, additional
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- 2024
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11. Fictitious Domain Methods for Fracture Models in Elasticity
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Bodart, Olivier, Cayol, Valérie, Court, Sébastien, Koko, Jonas, Bock, Hans Georg, Series editor, de Hoog, Frank, Series editor, Friedman, Avner, Series editor, Gupta, Arvind, Series editor, Nachbin, André, Series editor, Ozawa, Tohru, Series editor, Pulleyblank, William R., Series editor, Rusten, Torgeir, Series editor, Santosa, Fadil, Series editor, Seo, Jin Keun, Series editor, Tornberg, Anna-Karin, Series editor, Russo, Giovanni, editor, Capasso, Vincenzo, editor, Nicosia, Giuseppe, editor, and Romano, Vittorio, editor
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- 2016
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12. The March–April 2007 Eruptions of Piton de la Fournaise as Recorded by Interferometric Data
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Froger, Jean-Luc, Cayol, Valérie, Famin, Vincent, Cimarelli, Corrado, Series editor, Müller, Sebastian, Series editor, Bachelery, Patrick, editor, Lenat, Jean-François, editor, Di Muro, Andrea, editor, and Michon, Laurent, editor
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- 2016
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13. Monitoring Volcano Deformation
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Cayol, Valérie, Peltier, Aline, Froger, Jean-Luc, BEAUDUCEL, François, Jouhannel, Sylvaine, Lénat Jean-François, Lagabrielle Yves, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), and Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)
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[SDU.STU.VO] Sciences of the Universe [physics]/Earth Sciences/Volcanology ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology - Abstract
International audience
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- 2022
14. Drivers of Volcano Deformation (DVD) validation and verification exercises: Phase 1
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Cayol, Valérie, Karlstrom, Leif, Crozier, Joshua, Montgomery-Brown, Emily, Bato, Mary-Grace, Vargas, Mario Angarita, Grapenthin, Ronni, Anderson, Kyle, Astort, Ana, Bodart, Olivier, Cannavo, Flavio, Currenti, Gilda, Dabaghi, Farshid, Garg, Deepak, Head, Matthew, Iozzia, Adriana, Le Mével, Hélène, McCluskey, Owen, Novoa, Camilla, Silverii, Francesca, Trasatti, Elisa, Shreve, Tara, Wang, Taiyi, and Zhan, Yan
- Abstract
Volcano geodesy typically requires the synthesis of ground deformation models with observational data. A wide variety of volcano deformation models have been developed, from simple point source models to sophisticated numerical approaches that attempt to account for realistic topographies, complex source geometries and heterogeneous geologic structure. A wide variety of inverse methods are also combined with these models to characterize the volcanic sources from the observed data. However, to date there has been no comprehensive attempt to intercompare volcano deformation models and inversion results, or to establish baseline standards of reproducibility. The Drivers of Volcano Deformation (DVD) exercises provide a community-driven framework to accomplish these goals with a series of exercises for verification - quantitative comparison of forward model outputs, and validation - comparison of inversion results from synthetic data. The forward model exercises begin with a spherical reservoir in a homogeneous half-space, for which an exact solution exists, then introduce topography, more complex source geometries, and heterogeneous elastic properties. The inversion exercises provide synthetic GNSS and InSAR datasets for spherical reservoirs in elastic half-spaces with varying noise, and assess the consistency and uniqueness with which reservoir location, volume change, radius and pressurization can be inverted. The forward models comparison resulted in multiple bugs being fixed in commonly used solutions. The variability of inversion results emphasizes the importance of model choice, inverse methods, and uncertainty quantification. The Drivers of Volcano Deformation exercises are planned to evolve with additional phases that will test more complex forward models and inverse problems., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
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- 2023
15. Time-dependent displacements during and after the April 2007 eruption of Piton de la Fournaise, revealed by interferometric data
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Froger, Jean-Luc, Famin, Vincent, Cayol, Valérie, Augier, Aurélien, Michon, Laurent, and Lénat, Jean-François
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- 2015
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16. Volcano‐Magnetic Signal Reveals Rapid Evolution of the Inner Structure of Piton de la Fournaise
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Gailler, Lydie, Labazuy, Philippe, Dumont, Quentin, Froger, Jean‐luc, Peltier, Aline, Finizola, Anthony, Cayol, Valérie, Chaput, Marie, Régis, Edouard, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Laboratoire Magmas et Volcans (LMV-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SPIN-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Observatoire Volcanologique du Piton de la Fournaise (OVPF), Institut de Physique du Globe de Paris (IPG Paris), Laboratoire GéoSciences Réunion (LGSR), Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris), Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Bureau d’études Stratagem974, and ANR-16-CE04-0004,SlideVOLC,Les déstabilisations volcaniques : de l'observation à un modèle global des déformations actives(2016)
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Geophysics ,Space and Planetary Science ,Geochemistry and Petrology ,Earth and Planetary Sciences (miscellaneous) ,[SDU.STU]Sciences of the Universe [physics]/Earth Sciences - Abstract
International audience
- Published
- 2023
17. A new method to invert InSAR data to resolve stress changes on a fracture embedded in a 3D heterogeneous crust
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Cayol, Valérie, Bodart, Olivier, Dabaghi, Farshid, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Institut Camille Jordan (ICJ), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Modélisation mathématique, calcul scientifique (MMCS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), and Cayol, Valerie
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Physics - Geophysics ,[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,FOS: Physical sciences ,[MATH.MATH-OC] Mathematics [math]/Optimization and Control [math.OC] ,[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,[MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC] ,Geophysics (physics.geo-ph) - Abstract
We present a new method to invert variable stress changes of fractures from InSAR ground displacements. Fractures can be either faults or magma intrusions, embeded in a 3D heterogeneous crust with prominent topographies. The method is based on a fictituous domain approach using a finite element discretization of XFEM type. A cost function involves the misfit between the solution of the physical problem and the observed data together with the smoothing terms. Regularization parameters are determined by using L-curves. The method is then reformulated to be applied to InSAR data (masked and noisy), projected in Earth-Satellite directions. Synthetic tests confirm the efficiency and effectiveness of our method.
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- 2022
18. Precursor-free eruption triggered by edifice rupture at Nyiragongo volcano
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Smittarello, Delphine, Smets, Benoit, Barrière, Julien, Michellier, Caroline, Oth, Adrien, Shreve, Tara, Grandin, Raphaël, Theys, Nicolas, Brenot, Hugues, Cayol, Valérie, Allard, Patrick, Caudron, Corentin, Chevrel, Oryaëlle, Darchambeau, François, de Buyl, Pierre, Delhaye, Louise, Derauw, Dominique, Ganci, Gaetana, Geirsson, Halldór, Kamate Kaleghetso, Ephrem, Kambale Makundi, J., Kambale Nguomoja, I., Kasereka Mahinda, C., Kervyn, Matthieu, Kimanuka Ruriho, C., Le Mével, Hélène, Molendijk, Sander, Namur, Olivier, Poppe, Sam, Schmid, Martin, Subira, Josué Muhindo J., Wauthier, Christelle, Yalire, Mathieu Mapendano M., d’Oreye, N., Kervyn, Francois, Syavulisembo Muhindo, A., Smittarello, Delphine, Smets, Benoit, Barrière, Julien, Michellier, Caroline, Oth, Adrien, Shreve, Tara, Grandin, Raphaël, Theys, Nicolas, Brenot, Hugues, Cayol, Valérie, Allard, Patrick, Caudron, Corentin, Chevrel, Oryaëlle, Darchambeau, François, de Buyl, Pierre, Delhaye, Louise, Derauw, Dominique, Ganci, Gaetana, Geirsson, Halldór, Kamate Kaleghetso, Ephrem, Kambale Makundi, J., Kambale Nguomoja, I., Kasereka Mahinda, C., Kervyn, Matthieu, Kimanuka Ruriho, C., Le Mével, Hélène, Molendijk, Sander, Namur, Olivier, Poppe, Sam, Schmid, Martin, Subira, Josué Muhindo J., Wauthier, Christelle, Yalire, Mathieu Mapendano M., d’Oreye, N., Kervyn, Francois, and Syavulisembo Muhindo, A.
- Abstract
Classical mechanisms of volcanic eruptions mostly involve pressure buildup and magma ascent towards the surface1. Such processes produce geophysical and geochemical signals that may be detected and interpreted as eruption precursors1–3. On 22 May 2021, Mount Nyiragongo (Democratic Republic of the Congo), an open-vent volcano with a persistent lava lake perched within its summit crater, shook up this interpretation by producing an approximately six-hour-long flank eruption without apparent precursors, followed—rather than preceded—by lateral magma motion into the crust. Here we show that this reversed sequence was most likely initiated by a rupture of the edifice, producing deadly lava flows and triggering a voluminous 25-km-long dyke intrusion. The dyke propagated southwards at very shallow depth (less than 500 m) underneath the cities of Goma (Democratic Republic of the Congo) and Gisenyi (Rwanda), as well as Lake Kivu. This volcanic crisis raises new questions about the mechanisms controlling such eruptions and the possibility of facing substantially more hazardous events, such as effusions within densely urbanized areas, phreato-magmatism or a limnic eruption from the gas-rich Lake Kivu. It also more generally highlights the challenges faced with open-vent volcanoes for monitoring, early detection and risk management when a significant volume of magma is stored close to the surface., SCOPUS: ar.j, info:eu-repo/semantics/published
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- 2022
19. Structural failure and shallow dike intrusion at Nyiragongo volcano (D.R Congo)
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Smittarello, Delphine, primary, Barrière, Julien, additional, d'Oreye, Nicolas, additional, Smets, Benoit, additional, Oth, Adrien, additional, Michellier, Caroline, additional, Shreve, Tara, additional, Grandin, Raphael, additional, Cayol, Valérie, additional, Wauthier, Christelle, additional, Derauw, Dominique, additional, Geirsson, Halldor, additional, Theys, Nicolas, additional, Brenot, Hugues, additional, Froger, Jean-Luc, additional, Muhindo, Adalbert, additional, and Kervyn, François, additional
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- 2022
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20. Surveillance de la déformation des volcans
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Cayol, Valérie, Peltier, Aline, Froger, Jean-Luc, Beauducel, François, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Lénat Jean-François, and Jouhannel, Sylvaine
- Subjects
[SDU.STU.VO] Sciences of the Universe [physics]/Earth Sciences/Volcanology ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology - Published
- 2022
21. Monitoring of Volcano deformation
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Cayol, Valérie, Peltier, Aline, Froger, Jean-Luc, Beauducel, François, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Lénat Jean-François, and Jouhannel, Sylvaine
- Subjects
[SDU.STU.VO] Sciences of the Universe [physics]/Earth Sciences/Volcanology ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology - Abstract
International audience
- Published
- 2022
22. The March–April 2007 Eruptions of Piton de la Fournaise as Recorded by Interferometric Data
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Froger, Jean-Luc, primary, Cayol, Valérie, additional, and Famin, Vincent, additional
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- 2015
- Full Text
- View/download PDF
23. Edifice growth, deformation and rift zone development in basaltic setting: Insights from Piton de la Fournaise shield volcano (Réunion Island)
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Michon, Laurent, Cayol, Valérie, Letourneur, Ludovic, Peltier, Aline, Villeneuve, Nicolas, and Staudacher, Thomas
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- 2009
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24. Formation of the April 2007 caldera collapse at Piton de La Fournaise volcano: Insights from GPS data
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Peltier, Aline, Staudacher, Thomas, Bachèlery, Patrick, and Cayol, Valérie
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- 2009
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25. Structures involved in the vertical deformation at Lake Taupo (New Zealand) between 1979 and 2007: New insights from numerical modelling
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Peltier, Aline, Hurst, Tony, Scott, Bradley, and Cayol, Valérie
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- 2009
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26. Mitigating bias in inversion of InSAR data resulting from radar viewing geometries
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Dumont, Quentin, primary, Cayol, Valérie, additional, and Froger, Jean-Luc, additional
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- 2021
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27. What triggers caldera ring-fault subsidence at Ambrym volcano? Insights from the 2015 dike intrusion and eruption
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Shreve, Tara, primary, Grandin, Raphaël, additional, Smittarello, Delphine, additional, Cayol, Valérie, additional, Pinel, Virginie, additional, Boichu, Marie, additional, and Morishita, Yu, additional
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- 2021
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28. Apport de la modélisation des déformations à la compréhension du volcanisme
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Cayol, Valérie, Laboratoire Magmas et Volcans (LMV), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement et la société-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Université Jean Monnet [Saint-Étienne] (UJM), Université Clermont Auvergne, Christel Tiberi, Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), and Jouhannel, Sylvaine
- Subjects
volcanism ,[SDU.STU.VO] Sciences of the Universe [physics]/Earth Sciences/Volcanology ,deformation ,volcanisme ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology ,modelization ,déformation ,modélisation - Abstract
My research aims mainly at characterizing the structure and the feeding system of volcanicedifices from surface deformations. This research has led me to estimate the impact ofmagma injections on the stability of volcanic edifices. To reach these objectives, I amcarrying out in parallel methodological developments and applications to volcanic edifices,in the context of both shield volcanoes and continental rift. In order to better analyze the complexity of signals revealed by InSAR, I have developednumerical methods allowing the 3D modeling of displacements and stresses inhomogeneous elastic media. These methods take into account complex intrusion shapes(curved quadrangular), reservoirs of various shapes and mechanical interactions betweensources. I first showed the usefulness of 3D models for volcanic edifices with prominenttopographies. These methods were then combined with inversions. One of the originalityand one of the interests of these methods is that stress is the inverted parameter. Theseinversions are thus more physical, but also more informative than the commonly usedmethods that determine displacement distributions on the sources (the so-called kinematicmethods). Nos inversions may provide information on the mechanisms at the origin of thesurface displacements (sheared intrusion or fault), and on the crustal stresses (lithostaticversus extensive). Since 2013, in collaboration with mathematicians, we are developing anew class of methods for heterogeneous media based on the concept of fictituousdomains, so that these methods can be fast enough to be combined with inversions. Weare currently working on solving stress variations in heterogeneous media, whether theapplications concern tectonics or volcanology. In order to make these methods accessibleto a large community of users, I have developed an interface and a web platform(http://www.opgc.fr/defvolc) for on-demand computing. Displacement analysis usually lead to non-unique models. To overcome this problem, Iintroduce other data such as continuous displacement measurements (GNSS), seismicityor gravity data, and I take into account the physics of the studied phenomena. Jointinversions of continuous GNSS data and InSAR data have been developed to follow thepropagation of magma in an intrusion. With J. Dieterich, I have used the deformations tovalidate a new method of stress determination, based on seismicity rates and "rate andstate" friction laws. In collaboration with physicists, a robust method of joint inversion ofmuographic and gravimetric data has been developed to better characterize the structureof sub-kilometer volcanic edifices. Since 2018, a new method for the joint inversion oftemporal gravimetry and InSAR data for intrusions in heterogeneous 3D environments isbeing been developed. This method will be tested on 3 eruptions that occurred at Piton dela Fournaise in 2019 and were covered by our measurements. Finally, a future project,initiated during my sabbatical year at the Cascade Volcano Observatory, will be to integratedeformation, seismicity rates and gravity variations in Bayesian inversions in order toreconcile the contradictory observations (lack of deformation but increase in gravity) madeat Mt St Helens between 2010 and 2014.Deformation inversions have been applied to the study of magma transfers. At Kilauea, Iwas thus able to obtain magma feeding rates over the period 1975-1983 and showed thatthis rate (0.18 km3 /an) was twice as high as previously estimated. At Piton de laFournaise, with Yo Fukushima, we showed that intrusions were superficial (, RésuméMes recherches visent principalement à caractériser la structure et le systèmed'alimentation des édifices volcaniques à partir des déformations de la surface. Cesrecherches m'ont amenée à estimer l'impact des injections de magma sur la stabilité desédifices. Pour atteindre ces objectifs, je mène en parallèle des développementsméthodologiques et des applications à des édifices volcaniques dans des contextes devolcans boucliers ou de rift continental. Afin de mieux analyser les signaux complexes révélés par l'INSAR, j'ai développé desméthodes numériques permettant des modélisations 3D des déplacements et descontraintes dans des milieux élastiques homogènes. Ces méthodes prennent en comptedes formes d'intrusions réalistes (quadrangulaires courbés), des réservoirs de formesvariées et les interactions mécaniques entre sources. J'ai tout d'abord montré l'utilité demodélisations 3D avec topographies pour les édifices volcaniques. Ces méthodes ontensuite été combinées à des inversions. Une des originalités et un des intérêts de cesméthodes est que ce sont les contraintes qui sont inversées. Ces inversions sont doncplus physiques, mais aussi plus informatives que les méthodes couramment utilisées quidéterminent les déplacements des sources (méthodes dites cinématiques). Nos inversionsrenseignent sur les mécanismes à l'origine des déplacements de la surface (intrusioncisaillée ou faille), et sur les contraintes crustales (lithostatique versus extensive). Depuis2013, en collaboration avec des mathématiciens, nous développons une nouvelle classede méthodes pour milieux hétérogènes basée sur le concept de domaines fictifs, afin queces méthodes puissent être assez rapides pour utilisées dans des inversions. Nouscherchons actuellement à résoudre les variations de contraintes en milieu hétérogène,pour des applications en tectonique et en volcanologie. Afin de rendre ces méthodesaccessibles à une large communauté d'utilisateurs, j'ai développé une interface et uneplateforme web (http://www.opgc.fr/defvolc) de calcul à la demande. L'analyse des déplacements conduit le plus souvent à des modèles non uniques. Pourpalier à ce problème, j’introduis d'autres données que ce soient des données dedéplacements continus (GNSS), des données de sismicité ou de gravité, et je prends encompte la physique des phénomènes étudiés. Ainsi, des inversions conjointes de donnéesGNSS continues et de données InSAR ont été développées pour suivre la propagation dumagma dans une intrusion Avec J. Dieterich, j'ai utilisé les déformations pour valider unenouvelle méthode de détermination des contraintes, à partir des taux de sismicité et deslois de friction "rate and state". En collaboration avec des physiciens, une méthode robusted'inversion conjointe de données de muographie et de gravimétrie a été développés afinde mieux caractériser la structure d'édifices volcaniques sub-kilométriques. Depuis 2018,une nouvelle méthode d'inversion conjointe de données de gravimétrie temporelle et dedonnées InSAR, pour des intrusions en milieux 3D hétérogènes est développée. Cetteméthode sera testée sur 3 éruptions qui se sont produites au Piton de la Fournaise en2019 et qui ont été couvertes par nos mesures. Enfin, un projet futur, initié lors de monannée sabbatique au Cascade Volcano Observatory, sera d'intégrer les déformations, lestaux de sismicité et les variations de gravité dans des inversions Bayésiennes afin deréconcilier les observations contradictoires (absence de déformation mais augmentationde gravité) faites au Mt St Helens entre 2010 et 2014.Les inversions de déformations ont été appliquées à l'étude des transferts de magmas. AuKilauea, j'ai ainsi pu obtenir des taux d'alimentation en magma sur la période 1975-1983 etj'ai montré que ce taux (0.18 km3/an) était deux fois plus important que celui estiméprécédemment. Au Piton de la Fournaise, avec Y. Fukushima, nous avons montré que lesintrusions étaient superficielles (
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- 2020
29. Towards joint modelling and inversion of surface displacements and microgravimetric temporal variations for the characterization of eruptive sources at the Piton de la Fournaise volcano
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Barnoud, Anne, Cayol, Valérie, Gailler, Lydie, Smittarello, Delphine, Bodart, Olivier, Hrysiewicz, Alexis, Dabaghi, Farshid, Froger, Jean-Luc, Peltier, Aline, Chevrel, Magdalena Oryaëlle, Roult, Jérémy, Chaput, Marie, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université Jean Monnet - Saint-Étienne (UJM), Université de Lyon, Observatoire Volcanologique du Piton de la Fournaise (OVPF), Institut de Physique du Globe de Paris (IPG Paris), Laboratoire GéoSciences Réunion (LGSR), Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris), Bertrand, Véronique, Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Jean Monnet [Saint-Étienne] (UJM), Institut de Physique du Globe de Paris, and Université de La Réunion (UR)-Institut de Physique du Globe de Paris
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Volcan ,Piton de la Fournaise ,GMOB ,Instrumentation mobile ,[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,RESIF ,Field instrumentation ,[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,Volcano - Abstract
Our objective is to develop numerical tools to jointly model and invert surface displacements (InSAR/GNSS) and gravimetric temporal variations in order to improve the characterization of the eruptive sources of the Piton de la Fournaise volcano. GNSS and InSAR data are acquired, processed and made available on a regular basis by the national services of OVPF and OPGC. We have established a new microgravimetric network and acquired repeated measurements between May and September 2019 using the Scintrex CG5 and CG6 relative gravity meters (Gmob-Résif). The poster briefly describes the project and presents the data for the three consecutive flares in June, July and August 2019. This poster was presented at the Résif Scientific and Technical Meetings held in Biarritz in November 2019. Résif is a national research infrastructure dedicated to the observation and understanding of the Earth's internal structure and dynamics. Résif is based on high technology observation networks, composed of seismological, geodetic and gravimetric instruments deployed in a dense manner throughout the French territory. The data collected allow the study of ground deformation, surface and deep structures, local and global seismicity and natural hazards, particularly seismic, on the French territory with a high spatio-temporal resolution. Résif is integrated into the European (EPOS - European Plate Observing System) and worldwide instruments that allow to image the Earth's interior in its entirety and to study many natural phenomena., Notre objectif est de développer des outils numériques pour modéliser et inverser conjointement les déplacements de surface (InSAR/GNSS) et les variations temporelles gravimétriques afin d'améliorer la caractérisation des sources éruptives du volcan Piton de la Fournaise. Les données GNSS et InSAR sont acquises, traitées et mises à disposition régulièrement par les services nationaux de l'OVPF et de l'OPGC. Nous avons établi un nouveau réseau microgravimétrique et acquis des mesures répétées entre mai et septembre 2019 en utilisant les gravimètres relatifs Scintrex CG5 et CG6 (Gmob-Résif). L'affiche décrit brièvement le projet et présente les données pour les trois éruptions consécutives de juin, juillet et août 2019. Ce poster a été présenté aux Rencontres scientifiques et techniques Résif qui se sont déroulées à Biarritz en novembre 2019. Résif est une infrastructure de recherche nationale dédiée à l’observation et la compréhension de la structure et de la dynamique Terre interne. Résif se base sur des réseaux d’observation de haut niveau technologique, composés d’instruments sismologiques, géodésiques et gravimétriques déployés de manière dense sur tout le territoire français. Les données recueillies permettent d’étudier avec une haute résolution spatio-temporelle la déformation du sol, les structures superficielles et profondes, la sismicité à l’échelle locale et globale et les aléas naturels, et plus particulièrement sismiques, sur le territoire français. Résif s’intègre aux dispositifs européens (EPOS - European Plate Observing System) et mondiaux d’instruments permettant d’imager l’intérieur de la Terre dans sa globalité et d’étudier de nombreux phénomènes naturels.
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- 2019
30. Robust Bayesian Joint Inversion of Gravimetric and Muographic Data for the Density Imaging of the Puy de Dôme Volcano (France)
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Barnoud, Anne, primary, Cayol, Valérie, additional, Lelièvre, Peter G., additional, Portal, Angélie, additional, Labazuy, Philippe, additional, Boivin, Pierre, additional, and Gailler, Lydie, additional
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- 2021
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31. Bayesian joint inversion of muographic and gravimetric data for the 3D imaging of volcanoes, case study of the Puy de Dôme
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Barnoud, Anne, primary, Cayol, Valérie, additional, Lelièvre, Peter, additional, Niess, Valentin, additional, Cârloganu, Cristina, additional, and Le Ménédeu, Eve, additional
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- 2020
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32. Apport des données SAR à la compréhension et à la surveillance des volcans : exemple du Piton de la Fournaise
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Froger, Jean-Luc, primary, Pinel, Virginie, additional, Bato, Mary-Grace, additional, Tridon, Marine, additional, Smittarello, Delphine, additional, Prival, Jean-Marie, additional, Hrysiewicz, Alexis, additional, Cayol, Valérie, additional, and Guehenneux, Yannick, additional
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- 2020
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33. Orbital pass weighting of InSAR data for displacement inversion: Application to Piton de la Fournaise eruption
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Dumont, Quentin, Cayol, Valérie, Froger, Jean-Luc, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS), Jouhannel, Sylvaine, Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)
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[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,[SDU.STU.VO] Sciences of the Universe [physics]/Earth Sciences/Volcanology ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology ,[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
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- 2019
34. The use of earthquake rate changes as a stress meter at Kilauea volcano
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Dieterich, James, Cayol, Valérie, and Okubo, Paul
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- 2000
35. High Magma Storage Rates Before the 1983 Eruption of Kilauea, Hawaii
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Cayol, Valérie, Dieterich, James H., Okamura, Arnold T., and Miklius, Asta
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- 2000
36. Fictitious domain method for an inverse problem in volcanos
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Bodart, Oliver, Cayol, Valérie, Dabaghi, Farshid, Koko, Jonas, Modélisation mathématique, calcul scientifique (MMCS), Institut Camille Jordan [Villeurbanne] (ICJ), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université Jean Monnet [Saint-Étienne] (UJM), Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Informatique, de Modélisation et d'optimisation des Systèmes (LIMOS), SIGMA Clermont (SIGMA Clermont)-Université d'Auvergne - Clermont-Ferrand I (UdA)-Ecole Nationale Supérieure des Mines de St Etienne-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), BODART, Olivier, Institut Camille Jordan (ICJ), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Université Jean Monnet - Saint-Étienne (UJM), Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), and Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université d'Auvergne - Clermont-Ferrand I (UdA)-SIGMA Clermont (SIGMA Clermont)-Ecole Nationale Supérieure des Mines de St Etienne (ENSM ST-ETIENNE)-Centre National de la Recherche Scientifique (CNRS)
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[MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP] ,[MATH.MATH-OC] Mathematics [math]/Optimization and Control [math.OC] ,[MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC] ,[MATH.MATH-AP] Mathematics [math]/Analysis of PDEs [math.AP] - Abstract
International audience; An inverse problem applied to volcanology is studied. It consists in the determination of the pressure applied to a crack in order to fit observed ground deformations. The deformation of the volcano is assumed to be governed by a linear elasticity PDE. The direct problem is solved via a fictitious domain method, using a finite element discretization of XFEM type. The gradient of the cost function is derived from a Lagrangian. A numerical test is presented.
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- 2018
37. Joint inversion of muographic and gravimetric data with a Bayesian formalism for the 3D density imaging of volcanoes
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Barnoud, Anne, Cayol, Valérie, V., Niess, Cârloganu, Christina, Lelièvre, P., Le Menedeu, E., Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS), Laboratoire de Physique de Clermont (LPC), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), and Jouhannel, Sylvaine
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[SDU.STU.VO] Sciences of the Universe [physics]/Earth Sciences/Volcanology ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2018
38. Combining InSAR and GNSS to Track Magma Transport at Basaltic Volcanoes
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Smittarello, Delphine, primary, Cayol, Valérie, additional, Pinel, Virginie, additional, Froger, Jean-Luc, additional, Peltier, Aline, additional, and Dumont, Quentin, additional
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- 2019
- Full Text
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39. Bayesian joint muographic and gravimetric inversion applied to volcanoes
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Barnoud, Anne, primary, Cayol, Valérie, additional, Niess, Valentin, additional, Cârloganu, Cristina, additional, Lelièvre, Peter, additional, Labazuy, Philippe, additional, and Le Ménédeu, Eve, additional
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- 2019
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40. Joint inversion methods with relative density offset correction for muon tomography and gravity data, with application to volcano imaging
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Lelièvre, Peter G, primary, Barnoud, Anne, additional, Niess, Valentin, additional, Cârloganu, Cristina, additional, Cayol, Valérie, additional, and Farquharson, Colin G, additional
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- 2019
- Full Text
- View/download PDF
41. Observatoire INSAR de L’océan indien (OI2), un volcan sous haute surveillance
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Froger, Jean-Luc, Cayol, Valérie, Tridon, M., Bato, M. G., Prival, Jean-Marie, Villeneuve, Nicolas, Peltier, P., Augier, A., Rivet, S., Guéhenneux, Yannick, Univ, Réunion, Patrick Bachèlery, D. Laporte, J. Van Baelen, P. Schiano, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Laboratoire GéoSciences Réunion (LGSR), Université de La Réunion (UR)-Institut de Physique du Globe de Paris, Observatoire Volcanologique du Piton de la Fournaise (OVPF), Institut de Physique du Globe de Paris, Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris), and Institut de Physique du Globe de Paris (IPG Paris)
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[SDU.STU.VO] Sciences of the Universe [physics]/Earth Sciences/Volcanology ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2016
42. Inversion of coeval shear and normal stress of Piton de la Fournaise flank displacement
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Tridon, Marine, primary, Cayol, Valérie, additional, Froger, Jean‐Luc, additional, Augier, Aurélien, additional, and Bachèlery, Patrick, additional
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- 2016
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43. XFEM-Based Fictitious Domain Method for Linear Elasticity Model with Crack
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Bodart, Olivier, primary, Cayol, Valérie, additional, Court, Sébastien, additional, and Koko, Jonas, additional
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- 2016
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44. Magma Pathways and Their Interactions Inferred from InSAR and Stress Modeling at Nyamulagira Volcano, D.R. Congo
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Wauthier, Christelle, primary, Cayol, Valérie, additional, Smets, Benoît, additional, d’Oreye, Nicolas, additional, and Kervyn, François, additional
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- 2015
- Full Text
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45. Nyamulagira’s magma plumbing system revealed by 15 years of InSAR
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Wauthier, Christelle, Cayol, Valérie, Poland, Mike, Kervyn, Francois, D'oreye De Lantremange, Nicolas, Hooper, Andy, Samsonov, Sergey, Tiampo, Kristy, Smets, Benoît, Pyle, D.m., Mather, T.a., Biggs, J., Physical Geography, and Geography
- Subjects
Nyamulagira - Abstract
Nyamulagira, located in the east of the Democratic Republic of Congo on the western branch of the East African rift, is Africa's most active volcano, with an average of one eruption every 3 years since 1938. Owing to the socio-economical context of that region, the volcano lacks ground-based geodetic measurements but has been monitored by interferometric synthetic aperture radar (InSAR) since 1996. A combination of 3D Mixed Boundary Element Method and inverse modelling, taking into account topography and source interactions, is used to interpret InSAR ground displacements associated with eruptive activity in 1996, 2002, 2004, 2006 and 2010. These eruptions can be fitted by models incorporating dyke intrusions, and some (namely the 2006 and 2010 eruptions) require a magma reservoir beneath the summit caldera. We investigate inter-eruptive deformation with a multi-temporal InSAR approach. We propose the following magma plumbing system at Nyamulagira by integrating numerical deformation models with other available data: a deep reservoir (c. 25 km depth) feeds a shallower reservoir (c. 4 km depth); proximal eruptions are fed from the shallow reservoir through dykes while distal eruptions can be fed directly from the deep reservoir. A dyke-like conduit is also present beneath the upper southeastern flank of Nyamulagira.
- Published
- 2013
46. Magma sources involved in the 2002 Nyiragongo eruption, as inferred from an InSAR analysis
- Author
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Wauthier, C., Cayol, Valérie, Kervyn, Francois, d'Oreye, Nicolas, Earth Sciences Department [Tervuren], Royal Museum for Central Africa [Tervuren] (RMCA), GeMMe Unit - Georesources and Geo-Imaging, Université de Liège, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Geophysics/Astrophysics, National Museum of Natural History [Luxembourg], European Center for Geodynamics and Seismology, Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), and Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Nyiragongo ,numerical modeling ,non-linear inversion ,[SDE.MCG]Environmental Sciences/Global Changes ,East African Rift ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology ,radar interferometry ,crustal stresses - Abstract
International audience; On 17 January 2002, Nyiragongo volcano erupted along a 20 km-long fracture network extending from the volcano to the city of Goma. The event was captured by InSAR data from the ERS-2 and RADARSAT-1 satellites. A combination of 3D numerical modeling and inversions is used to analyze these displacements. Using Akaike Information Criteria, we determine that a model with two subvertical dikes is the most likely explanation for the 2002 InSAR deformation signal. A first, shallow dike, 2 km high, is associated with the eruptive fissure, and a second, deeper dike, 6 km high and 40 km long, lies about 3 km below the city of Goma. As the deep dike extends laterally for 20 km beneath the gas-rich Lake Kivu, the interaction of magma and dissolved gas should be considered as a significant hazard for future eruptions. A likely scenario for the eruption is that the magma supply to a deep reservoir started ten months before the eruption, as indicated by LP events and tremor. Stress analysis indicates that the deep dike could have triggered the injection of magma from the lake and shallow reservoir into the eruptive dike. The deep dike induced the opening of the southern part of this shallow dike, to which it transmitted magma though a narrow dike. This model is consistent with the geochemical analysis, the lava rheology and the pre- and post-eruptive seismicity. We infer low overpressures (1-10 MPa) for the dikes. These values are consistent with lithostatic crustal stresses close to the dikes and low magma pressure. As a consequence, the dike direction is probably not controlled by stresses but rather by a reduced tensile strength, inherited from previous rift intrusions. The lithostatic stresses indicate that magmatic activity is intense enough to relax tensional stresses associated with the rift extension.
- Published
- 2012
47. Evolution of magma conduits during the 1998-2000 eruptions of Piton de la Fournaise volcano, Réunion Island
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Fukushima, Yo, Cayol, Valérie, Philippe, Durand, Didier, Massonnet, Department of Geophysics [Stanford], Stanford EARTH, Stanford University-Stanford University, Laboratoire Magmas et Volcans (LMV), Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Centre National d'Études Spatiales [Toulouse] (CNES), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), and Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
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[SDE.MCG]Environmental Sciences/Global Changes ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology - Abstract
International audience; At basaltic volcanoes, magma is transported to the surface through dikes (magmafilled fractures), but the evolution of these dikes as eruptions proceed is rarely documented. In March 1998, after five and a half years of quiescence, Piton de la Fournaise volcano (Réunion Island) entered into a new eruptive phase characterized by intense eruptive activity. Coeruptive displacements recorded by interferometric synthetic aperture radar (InSAR) for the first five eruptions of the cycle are analyzed using 3‐D boundary element models combined with a Monte Carlo inversion method. We show that the eruptions are associated with the emplacement of lateral dikes rooted at depths of less than about 1000 m, except for the first March 1998 event where an additional deeper source is required. The dikes are located above preeruptive seismic swarms. This is consistent with nearly isotropic stress caused by repeated dike intrusions and low confining pressure enhanced by the presence of pores in the shallowest 1000 m of the edifice. The volumes of the modeled dikes represent 17% of the volume of emitted lava, showing that exogenous growth plays a major role in building the volcano. By taking into account the preeruptive seismicity and tilt data together with the results of InSAR data modeling, we find that dikes first propagate vertically from a source region below sea level before being injected laterally at shallow depth. This behavior is consistent with the presence of levels of neutral buoyancy at shallow depth in the edifice.
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- 2010
48. Apport des données TERRASAR-X pour le suivi de l'activité du Piton de la Fournaire
- Author
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Froger, Jean-Louis, primary, Souriot, Thierry, additional, Villeneuve, Nicolas, additional, Rabaute, Thierry, additional, Durand, Philippe, additional, Cayol, Valérie, additional, Di Muro, Andréa, additional, Staudacher, Thomas, additional, and Fruneau, Bénédicte, additional
- Published
- 2014
- Full Text
- View/download PDF
49. Stress Changes Before and During the Pu‘u ‘Ö‘ö-Küpaianaha Eruption
- Author
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Dieterich, James, Cayol, Valérie, Okubo, Paul, U.S Geological Survey, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), U.S.G.S. Hawaiian Volcano Observatory, Cayol, Valerie, Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), and Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
eruption ,microearthquakes ,[SDU.STU.VO] Sciences of the Universe [physics]/Earth Sciences/Volcanology ,Kilauea ,deformation ,[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology ,Stress - Abstract
International audience; Surface deformation and earthquake data for Kïlauea Volcano have been analyzed as they pertain to stress interactions before and during the Pu‘u ‘Ö‘ö-Küpaianaha eruption. A newly developed method was used to solve for Coulomb stress changes from earthquake rate changes that facilitates quantitative comparisons between earthquake and deformation data sets. Between the 1975 M7.2 Kalapana earthquake and the start of the Pu‘u ‘Ö‘ö-Küpaianaha eruption in 1983, deformation rates of Kïlauea Volcano were the most rapid ever recorded. During this period, deformation was characterized by expansion of a dike-like magma system within Kïlauea’s rift zones, coupled with aseismic creep over a narrow zone of a low-angle fault located beneath the volcano’s south flank. For the 1976–83 period, the rate of rift opening is estimated to have averaged 40 cm per year on the basis of ground deformation. At the onset of the Pu‘u ‘Ö‘ö-Küpaianaha eruption in January 1983, the dike propagated to the surface to form the eruptive fissures. Deformation data and seismicity stress solutions indicate that a fivefold slowing of stressing rates in Kïlauea’s south flank occurred either in late 1979 or at the start of the of Pu‘u ‘Ö‘ö-Küpaianaha eruption in January 1983, depending on location. The stressing rates before and after the onset of the eruption are consistent with changes in volume of magma stored before and after the onset of the Pu‘u ‘Ö‘ö-Küpaianaha eruption.
- Published
- 2003
50. A comment on “Hidden dykes detected on ultra long period seismic signals at Piton de la Fournaise volcano?” by N. Houlié and J.-P. Montagner, EPSL 261, (2007)
- Author
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Battaglia, Jean and Cayol, Valérie
- Published
- 2009
- Full Text
- View/download PDF
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