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2. Seamount Subduction and Megathrust Seismicity: The Interplay Between Geometry and Friction

Author

Menichelli, I., Corbi, F., Brizzi, S., van Rijsingen, E., Lallemand, S., Funiciello, F., Menichelli, I., Corbi, F., Brizzi, S., van Rijsingen, E., Lallemand, S., and Funiciello, F.

Abstract

Subducting seamounts are recognized as one of the key features influencing megathrust earthquakes. However, whether they trigger or arrest ruptures remains debated. Here, we use analog models to study the influence of a single seamount on megathrust earthquakes, separating the effect of topography from that of friction. Four different model configurations have been developed (i.e., flat interface, high and low friction seamount, low friction patch). In our models, the seamount reduces recurrence time, interseismic coupling, and fault strength, suggesting that it acts as a barrier: 80% of the ruptures concentrate in flat regions that surround the seamount and only smaller magnitude earthquakes nucleate above it. The low-friction zone, which mimics the fluid accumulation or the establishment of fracture systems in natural cases, seems to be the most efficient in arresting rupture propagation in our experimental setting.

Published
2023

6. Caribbean Plate Boundaries Control on the Tectonic Duality in the Back‐Arc of the Lesser Antilles Subduction Zone During the Eocene

Author

Cerpa, N. G., primary, Hassani, R., additional, Arcay, D., additional, Lallemand, S., additional, Garrocq, C., additional, Philippon, M., additional, Cornée, J.‐J., additional, Münch, P., additional, Garel, F., additional, Marcaillou, B., additional, Mercier de Lépinay, B., additional, and Lebrun, J.‐F., additional

Published
2021
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7. Elongated giant seabed polygons and underlying polygonal faults as indicators of the creep deformation of Pliocene to recent sediments in the Grenada Basin, Caribbean Sea

Author

Gay, Aurelien, Padron, C., Meyer, S., Beaufort, D., Oliot, E., Lallemand, S., Marcaillou, B., Philippon, M., Cornée, J‐j., Audemard, F., Lebrun, J‐f., Klingelhoefer, Frauke, Mercier De Lepinay, B., Münch, P., Garrocq, C., Boucard, M., Schenini, L., The Garanti Cruise Team, Géosciences Montpellier, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), Laboratoire Géodynamique et enregistrement Sédimentaire (LGS), Géosciences Marines (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Département Géosciences [Université de Poitiers], Université de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Universidad Nacional de San Luis [San Luis] (UNSL), ANR-17-CE31-0009,GAARAnti,Pont terrestre 'GAARlandia' vs voies de dispersion à travers les Petites Antilles–Couplage entre dynamique de la subduction et processus de l'évolution des espèces dans le domaine des Caraïbes.(2017), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Université des Antilles (UA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Géodynamique et enregistrement Sédimentaire - Geosciences Marines (GM-LGS), and Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)

Subjects
010504 meteorology & atmospheric sciences, seabed polygons, Outcrop, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Fault (geology), Structural basin, Deformation (meteorology), 010502 geochemistry & geophysics, 01 natural sciences, fluid seep, Paleontology, Geochemistry and Petrology, 14. Life underwater, Forearc, Seabed, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, Subsidence, 15. Life on land, Geophysics, Creep, volumetric contraction, Geology, polygonal faults, creep deformation
Abstract

International audience; Based on 2D seismic profiles, multibeam and seabed grab cores acquired during the Garanti cruise in 2017, 1–5 km wide seabed giant polygons were identified in the Grenada basin, covering a total area of ∼55,000 km2, which is the largest area of outcropping polygonal faults (PF) ever found on Earth so far. They represent the top part of an active 700–1,200 m thick underlying polygonal fault system (PFS) formed due to the volumetric contraction of clay- and smectite-rich sediments, initiated in the sub-surface at the transition between the Early to Middle Pliocene. The short axes of the best-fit ellipses obtained from a graphical center-to-center method were interpreted as the local orientation of a preferential contraction perpendicular to the creep deformation of slope sediments. In the North Grenada Basin, the polygons are relatively regular, but their short axes seem to be parallel to a N40°E extension recently evidenced in the forearc, possibly extending in the backarc, but not shown in the study area. They are most probably related to a progressive burial due to a homogeneous subsidence. In the South Grenada Basin, the polygons are more elongated and their axes are progressively rotating southeastward toward the depocenter, indicating a creep deformation toward the center of the basin created by a differential subsidence. Seabed polygons and underlying PF could thus be indicative of the deformation regime of shallow sediments related to main slopes controlled by two different basin architectures.

Published
2021
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8. Paleogene V-shaped basins and Neogene subsidence of the Northern Lesser Antilles Forearc

Author

Boucard, M, Marcaillou, B, Lebrun, Jf, Laurencin, M, Klingelhoefer, Frauke, Laigle, M, Lallemand, S, Schenini, L, Graindorge, David, Cornee, Jj, Munch, P, Philippon, M, The Antithesis 1, 3 And Garanti Scientific Teams., Boucard, M, Marcaillou, B, Lebrun, Jf, Laurencin, M, Klingelhoefer, Frauke, Laigle, M, Lallemand, S, Schenini, L, Graindorge, David, Cornee, Jj, Munch, P, Philippon, M, and The Antithesis 1, 3 And Garanti Scientific Teams.

Abstract

Oblique collision of buoyant provinces against subduction zones frequently results in individualizing and rotating regional-scale blocks. In contrast, the collision of the Bahamas Bank against the Northeastern Caribbean Plate increased the margin convexity triggering forearc fragmentation into small-scale blocks. This deformation results in a prominent >450- km-long sequence of V-shaped basins that widens trenchward separated by elevated spurs, in the Northern Lesser Antilles (NLA, i.e. Guadeloupe to Virgin Island). In absence of deep structure imaging, various competing models were proposed to account for this faults-bounded Basins-and-Spurs System. High-resolution bathymetric and deep multichannel seismic data acquired during cruises ANTITHESIS1-3, reveal a drastically different tectonic evolution of the NLA forearc. During Eocene-Oligocene time, the NLA margin accommodated the Bahamas Bank collision and the consecutive margin convex bending by trench-parallel extension along N40- 90°-trending normal faults, opening V-shaped valleys in the forearc. Backarc spreading in the Kalinago Basin and block rotations went along with this tectonic phase, which ends up with tectonic uplifts and an earliest-middle Miocene regional emersion phase. Post middle Miocene, regional subsidence and tectonic extension in the forearc is partly accommodated along the newly-imaged N300°-trending, 200-km-long Tintamarre Normal Faults Zone. This drastic subsidence phase reveals vigorous margin basal erosion, which likely generated the synchronous westward migration of the volcanic arc. Thus, unlike widely-accepted previous theoretical models, the first deep seismic images in the NLA forearc show that the NE-SW faulting and the prominent V-Shaped valleys result from a past and sealed tectonic phase related to the margin bending and consecutive blocks rotation.

Published
2021
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9. Caribbean plate boundaries control on the tectonic duality in the back‐arc of the Lesser Antilles subduction zone during the Eocene

Author

Cerpa, N. G., Hassani, R., Arcay, D., Lallemand, S., Garrocq, C., Philippon, M., Cornée, J.‐j., Münch, P., Garel, F., Marcaillou, B., Mercier De Lépinay, B., Lebrun, J.‐f., Cerpa, N. G., Hassani, R., Arcay, D., Lallemand, S., Garrocq, C., Philippon, M., Cornée, J.‐j., Münch, P., Garel, F., Marcaillou, B., Mercier De Lépinay, B., and Lebrun, J.‐f.

Abstract

The Eocene tectonic evolution of the easternmost Caribbean Plate (CP) boundary, i.e. the Lesser Antilles subduction zone (LASZ), is debated. Recents works shed light on a peculiar period of tectonic duality in the arc/back-arc regions. A compressional-to-transpressional regime occurred in the north, while rifting and seafloor spreading occurred in Grenada basin to the south. The mechanism for this strong spatial variation and its evolution through time has yet to be established. Here, using 3-D subduction mechanical models, we evaluate whether the change in the trench-curvature radius at the northeast corner of the CP could have modulated the duality. We assume asymmetrical CP boundaries at the north (from east to west: oblique subduction to strike-slip) and at the south (subduction-transform edge propagator-like behavior). Regardless of the imposed trench curvature, the southern half of our modeled CP undergoes a NW-to-W-oriented extension due to the tendency of the southernmost part of the South-America oceanic slab to rollback. In contrast, the tectonic regime in the northeast corner of the CP depends on the trench-curvature radius. A low radius promotes transtension-to-transpression, with a NE-oriented compressive component of the principal stress. A high radius largely reduces the compressive component and promotes an extensional regime similar to that in the south. We thus propose that an initially low-curvature radius of the NE-LASZ triggered the tectonic N-S duality in the Eocene and led to an ephemeral period of transpression/compression at the north. However, an additional mechanism might have been required to locally enhance compression.

Published
2021
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14. The Bunce Fault and Strain Partitioning in the Northern Lesser Antilles

Author

Laurencin, M., Marcaillou, B., Graindorge, David, Lebrun, J.‐f., Klingelhoefer, Frauke, Boucard, M., Laigle, M., Lallemand, S., Schenini, L., Laurencin, M., Marcaillou, B., Graindorge, David, Lebrun, J.‐f., Klingelhoefer, Frauke, Boucard, M., Laigle, M., Lallemand, S., and Schenini, L.

Abstract

Strain partitioning related to oblique plate convergence has long been debated in Northern Lesser Antilles. Geophysical data acquired during the ANTITHESIS cruises highlight that the sinistral strike‐slip Bunce Fault develops along the vertical, long, and linear discontinuity between the sedimentary wedge and a more rigid backstop. The narrowness of the 20‐ to 30‐km‐wide accretionary wedge and its continuity over ~850 km is remarkable. The Bunce Fault extends as far south as 18.5°N where it anastomoses within the accretionary prism where the sharp increase in convergence obliquity possibly acts as a mechanical threshold. Surface traces related to subducting seamounts suggest that 80% of the lateral component of the convergent motion is taken up by internal deformation within the accretionary prism and by the Bunce Fault. The absence of crustal‐scale, long‐term tectonic system south of the Anegada Passage casts doubt upon the degree of strain partitioning in the Northern Lesser Antilles. Plain Language Summary Lithospheric plates are frequently bounded by subduction zones where oceanic plates underthrust overriding plates. In most cases, this convergence is oblique to the margin, its resulting tectonic deformation is generally due to margin‐normal and margin‐parallel components of the plate convergence vector. At the Northern Lesser Antilles, the North American Plate subducts beneath the Caribbean Plate with oblique convergence increasing from Guadeloupe to Virgin Islands. This study aims to analyze and resolve the tectonic deformation along this margin. We acquired marine geophysical data during ANTITHESIS cruises (2014–2016) to image the seafloor and the crustal structure. We place a particular emphasis on the strike‐slip Bunce Fault, which extends over ~850 km, including a newly discovered 350‐km segment, 20–30 km landward from the trench. Although long strike‐slip faults have already been observed at oblique subduction zones, the proximity of the Bunce Fault to t

Published
2019
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16. Relation Between the Nature of the Subducting Plate, Heat Flow and Fluid Escape Structures at the Lesser Antilles Island arc

Author

Klingelhoefer, Frauke, Marcaillou, Boris, Laurencin, Muriel, Biari, Youssef, Laigle, Mireille, Graindorge, David, Evain, Mikael, Kopp, Heidrunn, Lallemand, S., Lebrun, Jean-Frederic, Paulatto, Michele, Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), and Marcaillou, Boris

Subjects
[SDU.STU] Sciences of the Universe [physics]/Earth Sciences, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

27. Paleogene V‐Shaped Basins and Neogene Subsidence of the Northern Lesser Antilles Forearc.

Author

Boucard, M., Marcaillou, B., Lebrun, J.‐F., Laurencin, M., Klingelhoefer, F., Laigle, M., Lallemand, S., Schenini, L., Graindorge, D., Cornée, J.‐J., Münch, P., Philippon, M., and the ANTITHESIS and GARANTI Scientific Teams

Abstract

Oblique collision of buoyant provinces against subduction zones frequently results in individualizing and rotating regional‐scale blocks. In contrast, the collision of the Bahamas Bank against the Northeastern Caribbean Plate increased the margin convexity triggering forearc fragmentation into small‐scale blocks. This deformation results in a prominent sequence of V‐shaped basins that widens trenchward separated by elevated spurs, in the Northern Lesser Antilles (NLA, i.e., Guadeloupe to Virgin Island). In absence of deep structure imaging, various competing models were proposed to account for this Basins‐and‐Spurs System. However, high‐resolution bathymetric and deep multichannel seismic data acquired during cruises ANTITHESIS 1‐3, reveal a drastically different tectonic evolution of the NLA Forearc. During Eocene‐Oligocene time, the Caribbean Northeastern Boundary accommodated the Bahamas Bank collision and the subsequent margin convex bending by major left‐lateral strike‐slip faults systems in the Greater Antilles and by trench‐parallel extension along N40°–90°‐trending normal faults in the NLA. Block rotations, forearc fracturing, and V‐shaped valleys opening went along with this tectonic phase, which ends up with tectonic uplifts and an earliest‐middle Miocene regional emersion phase. Post middle Miocene regional subsidence and tectonic extension in the forearc are partly accommodated along the newly imaged N300°‐trending, 200‐km‐long normal Tintamarre Faults Zone. This drastic subsidence phase reveals vigorous margin basal erosion, which likely generated the synchronous westward migration of the volcanic arc. Thus, unlike widely accepted previous theoretical models, the NE‐SW faulting and the prominent V‐shaped valleys result from a past and sealed tectonic phase related to the margin bending and subsequent blocks rotation. Key Points: The N. Lesser Antilles has undergone Eocene‐Oligocene NW‐SE extention and post mid Miocene NE‐SW extension separated by a regional emersionFault‐bounded V‐Shaped valleys result from past and sealed NW‐SE extention due to Bahamas Bank collision, margin bending, and blocks rotationDrastic post mid Miocene subsidence and synchronous westward migration of the volcanic arc reveal vigorous subduction‐related margin erosion [ABSTRACT FROM AUTHOR]

Published
2021
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32. The polyphased tectonic evolution of the Anegada Passage in the northern Lesser Antilles subduction zone

Author

Laurencin, Muriel, Marcaillou, B., Graindorge, D., Klingelhoefer, Frauke, Lallemand, S., Laigle, M., Lebrun, J. -f., Laurencin, Muriel, Marcaillou, B., Graindorge, D., Klingelhoefer, Frauke, Lallemand, S., Laigle, M., and Lebrun, J. -f.

Abstract

The influence of the highly oblique plate convergence at the northern Lesser Antilles onto the margin strain partitioning and deformation pattern, although frequently invoked, has never been clearly imaged. The Anegada Passage is a set of basins and deep valleys, regularly related to the southern boundary of the Puerto-Rico-Virgin-Islands (PRVI) microplate. Despite the publications of various tectonic models mostly based on bathymetric data, the tectonic origin and deformation of this Passage remains unconstrained in the absence of deep structure imaging. During cruises Antithesis 1 and 3 (2013 - 2016), we recorded the first deep multichannel seismic images and new multibeam data in the northern Lesser Antilles margin segment in order to shed a new light on the structure and tectonic pattern of the Anegada Passage. We image the northeastern extent of the Anegada Passage, from the Sombrero Basin to the Lesser Antilles margin front. Our results reveal that this northeastern segment is an EW-trending left-stepping en-échelon strike-slip system that consists of the Sombrero and Malliwana pull-apart basins, the Malliwana and Anguilla left-lateral faults and the NE-SW compressional restraining bend at the Malliwana Hill. Reviewing the structure of the Anegada Passage, from the South of Puerto-Rico to the Lesser Antilles margin front, reveals a polyphased tectonic history. A past NW-SE extension, possibly related to the rotation or escape of the PRVI block due to collision of the Bahamas Bank, and a currently active WNW-ESE strike-slip deformation associated to the shear component of the strain partitioning resulting from the subduction obliquity.

Published
2017
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33. Roughness characterization procedure for electropolished brass

Author

Rotty, C., Mandroyan, A., Doche, M.-L., Monney, S., Lallemand, S., Hihn, J.-Y., Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
[CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

34. Subduction Zone Dynamics: Preface

Author

LALLEMAND S, FUNICIELLO, FRANCESCA, LALLEMAND S. FUNICIELLO F., Lallemand, S, and Funiciello, Francesca

Published
2009

36. On the role of slab pull in the Cenozoic motion of the Pacific plate

Author

FACCENNA, CLAUDIO, Becker TW, Lallemand S, Steinberger B., Università degli Studi Roma Tre, University of Southern California (USC), Géosciences Montpellier, Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), GeoForschungsZentrum - Helmholtz-Zentrum Potsdam (GFZ), Faccenna, Claudio, Becker, Tw, Lallemand, S, and Steinberger, B.

Subjects
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, 550 - Earth sciences, subduction, Pacific
Abstract

We analyze the role of slab pull acting on the Pacific plate during its early Tertiary change in motion. Slab pull forces are estimated by integrating the negative buoyancy of a 700 km long slab along a revised subduction boundary model adopting the Muller et al. (2008) seafloor age reconstructions. Our results indicate that torques predicted from a simple slab pull model match the Pacific plate Euler vectors during the Tertiary fairly well. The change of the Pacific motion at similar to 50-40 Ma appears to be driven by the onset of the Izu-Bonin-Mariana system and, soon afterwards, by the Tonga-Kermadec subduction zones. Citation: Faccenna, C., T. W. Becker, S. Lallemand, and B. Steinberger (2012), On the role of slab pull in the Cenozoic motion of the Pacific plate, Geophys. Res. Lett., 39, L03305, doi: 10.1029/2011GL050155. RI Becker, Thorsten/A-6665-2010

Published
2012
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38. Subduction-triggered magmatic pulses: A new class of plumes? RID A-6665-2010 RID D-5469-2011

Author

FACCENNA, CLAUDIO, Becker TW, Lallemand S, Lagabrielle Y, FUNICIELLO, FRANCESCA, Piromallo C., Faccenna, Claudio, Becker, Tw, Lallemand, S, Lagabrielle, Y, Funiciello, Francesca, and Piromallo, C.

Abstract

A variety of atypical plume-like structures and focused upwellings that are not rooted in the lower mantle have recently been discussed, and seismological imaging has shown ubiquitous small-scale convection in the uppermost mantle in regions such as the Mediterranean region, the western US, and around the western Pacific. We argue that the three-dimensional return flow and slab fragmentation associated with complex oceanic subduction trajectories within the upper mantle can generate focused upwellings and that these may play a significant role in regional tectonics. The testable surface expressions of this process are the outsidearc alkaline volcanism, topographic swell, and low-velocity seismic anomalies associated with partial melt. Using three-dimensional, simplified numerical subduction models, we show that focused upwellings can be generated both ahead of the slab in the back-arc region (though ~five times further inward from the trench than arc-volcanism) and around the lateral edges of the slab (in the order of 100 km away from slab edges). Vertical mass transport, and by inference the associated decompression melting, in these regions appears strongly correlated with the interplay between relative trench motion and subduction velocities. The upward flux of material from the depths is expected to be most pronounced during the first phase of slab descent into the upper mantle or during slab fragmentation. We discuss representative case histories from the Pacific and the Mediterranean where we find possible evidence for such slab-related volcanism.

Published
2010

40. Subduction dynamics as revealed by trench migration

Author

LALLEMAND S., HEURET A., FACCENNA C., AND FUNICIELLO F, Lallemand, S, Heuret, A, Faccenna, Claudio, Funiciello, Francesca, A., Heuret, Géosciences Montpellier, Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Scienze Geologiche [Roma TRE], and Università degli Studi Roma Tre

Subjects
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, trench migration, subduction dynamics
Abstract

International audience; New estimates of trench migration rates allow us to address the dynamics of trench migration and back-arc strain. We show that trench migration is primarily controlled by the subducting plate velocity V-sub, which largely depends on its age at the trench. Using the hot and weak arc to back-arc region as a strain sensor, we define neutral arcs characterized by the absence of significant strain, meaning places where the forces (slab pull, bending, and anchoring) almost balance along the interface between the plates. We show that neutral subduction zones satisfy the kinematic relation between trench and subducting plate absolute motions: V-t = 0.5V(sub) - 2.3 (in cm a(-1)) in the HS3 reference frame. Deformation occurs when the velocity combination deviates from kinematic equilibrium. Balancing the torque components of the forces acting at the trench indicates that stiff (old) subducting plates facilitate trench advance by resisting bending.

Published
2008
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41. Predicting trench and plate motion from the dynamics of a strong slab

Author

HEURET A, FUNICIELLO, FRANCESCA, LALLEMAND S., FACCENNA, CLAUDIO, Heuret, A, Funiciello, Francesca, Faccenna, Claudio, and Lallemand, S.

Abstract

A combination of statistical studies on present-day subduction zones and three-dimensional (3D) laboratory models is performed with the aim to clarify the way that plate kinematics control the geometry of the slab and the overriding plate deformation in subduction zones. In 3D laboratory models, the analogue of a two layer linearly viscous lithosphere–upper mantle system is achieved by means of silicon putty glucose syrup tank experiment. The subducting and overriding plate velocities are systematically changed by exploring the variability field of natural plate kinematics. Both statistical and modelling approaches recognize the importance of overriding plate motion on subduction process behavior: (1) trenches migrate at a rate close to the overriding plate motion, but always move slower than the overriding plates. The mechanism at work is a direct consequence of “slab anchoring” opposed by both lithosphere and mantle viscous resistance and is responsible for overriding plate deformation and slab geometry variability. (2) An overriding plate shortens when the overriding plate moves toward the trench and conditions that are favourable for overriding plate extension are created when the overriding plate moves away from the trench. (3) Shallow and steep dips are found if the overriding plate moves toward and away from the trench, respectively.

Published
2007

43. Grafting and characterization of dodecylphosphonic acid on copper: Macro-tribological behavior and surface properties

Author

M.M., Moine, X., Roizard, L., Carpentier, P.H., Cornuault, J.M., Rauch, O., Heintz, Lallemand, S., Lallemand, Fabrice, Melot, J.M., Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2013

45. Corrosion protection by sonoelectrodeposited organic films on zinc coated steel

Author

Taouil M.M. Mahmoud F. Lallemand S. Lallemand M.P. Gigandet J.Y. Hihn, A.Et, Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2012

48. Morphological characterization and analytical application of PEDOT-Prussian Blue composite films electrodeposited in situ on platinum electrode chips

Author

Lupu B. Lakard J.Y. Hihn J. Dejeu Et P. Rougeot S. Lallemand, S., Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2011

49. The largest instrumentally recorded earthquake in Taiwan: revised location and magnitude, and tectonic significance of the 1920 event

Author

Theunissen, T., Font, Y., Lallemand, S., Liang, W.T., Géosciences Montpellier, Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Géoazur (GEOAZUR 6526), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), LIA (Associated International Laboratory), LIA, Institute of Earth Sciences [Tapei] (IES Sinica), Academia Sinica, Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Nice Sophia Antipolis (... - 2019) (UNS), and Université Côte d'Azur (UCA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)

Subjects
convergent [margins], seismotectonics [Dynamics], [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Subduction zone processes, Continental, Seismicity and tectonics
Abstract

International audience; The Ryukyu subduction is known to generate very few earthquakes in its central segment contrarily to its two extremities. We focus in this study on the southernmost part of the Ryukyu subduction zone offshore east Taiwan. Our first task was to build a homogeneous earthquake catalogue for the period 1900–2007. The new catalogue provides homogenized M′W magnitudes and shows that several M′W≥ 7.0 earthquakes occurred offshore Hualien and Suao cities. We then focused on the 1920 June 5 earthquake (reported surface wave magnitude 8.1) previously located beneath the accretionary prism. The revised moment magnitude has been estimated in our catalogue at 7.7 ± 0.2. It is the biggest earthquake ever recorded in the Taiwan area but the fault that has produced this earthquake has not yet been identified with confidence. We relocated this event using regional phases (seismological bulletins archived at the Central Weather Bureau of Taiwan) about 50 km NNE and shallower of its former location, that is, within the Ryukyu Arc basement. According to earthquake bulletin information, revised magnitude, new hypocentral determination and known regional faults, we propose four potential active faults as candidates for the slip associated to this event: (1) the interplate seismogenic zone (ISZ), (2) an out-of-sequence thrust cutting through the forearc and branching on the ISZ, (3) a NS strike-slip fault cutting through the Ryukyu arc and (4) a N–S, westward dipping thrust fault, affecting the Philippine Sea Plate east of the Luzon Arc. The best compromise is to consider a rupture along the ISZ with a shallow nucleation possibly along a splay-fault followed by a downward and lateral propagation of the rupture that would explain the lack of significant seafloor motion and subsequent tsunami. We also estimate the maximum seismic coupling of the ISZ in the region east of Taiwan to about 0.4. In parallel, the evidences of aseismic slip occurring along the ISZ allow us to conclude that this region should only be affected by M < 8 earthquakes.

Published
2010
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50. Ammonia Gas Sensor Based on Electrosynthesized Polypyrrole Films

Author

Carquigny J.B. Sanchez F. Berger B. Lakard F. Lallemand, S., Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2009

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