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9 results on '"Hiroyuki K. M"'

1. Muon Imaging of Volcanic Conduit Explains Link Between Eruption Frequency and Ground Deformation

Author

László Oláh, Giuseppe Gallo, Gergő Hamar, Osamu Kamoshida, Giovanni Leone, Edward W. Llewellin, Domenico Lo Presti, Gábor Nyitrai, Takao Ohminato, Shouhei Ohno, Hiroyuki K. M. Tanaka, and Dezső Varga

Subjects
Geophysics. Cosmic physics, QC801-809
Abstract

Abstract Understanding the physical mechanism of ground deformation at a volcano supports the use of deformation data as a monitoring tool. An inverse correlation was observed between eruption frequency and ground deformation of Sakurajima volcano from November 2018 to April 2021. Over the same period, the mass density of magma in the conduit was monitored via muography. Mass density increased during inflation, when eruption frequency was low, and decreased during deflation, when eruption frequency was high. Periods of low eruption frequency are associated with the formation of a dense plug in the conduit, which we infer caused the inflation of the edifice by trapping pressurized magmatic gas. Conversely, periods of high eruption frequency are associated with the absence of the plug, which we infer allows gas to escape, leading to deflation. Muography thus reveals the in‐conduit physical mechanism for the observed correlation, with implications for interpretation of deformation at other volcanoes.

Published
2023
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9. Observation of the Dynamics of Hydrothermal Activity in La Soufrière of Guadeloupe Volcano with Joint Muography, Gravimetry, Electrical Resistivity Tomography, Seismic and Temperature Monitoring

Author

Dominique Gibert, Jean Bremond d'Ars, Bruno Carlus, Sébastien Deroussi, Jean‐Christophe Ianigro, David E. Jessop, Kevin Jourde, Bruno Kergosien, Yves Le Gonidec, Nolwenn Lesparre, Jacques Marteau, Roberto Moretti, Florence Nicollin, Marina Rosas‐Carbajal, László Oláh, Hiroyuki K. M. Tanaka, Dezső Varga, Gibert, D., de Bremond d'Ars, J., Carlus, B., Deroussi, S., Ianigro, J. -C., Jessop, D. E., Jourde, K., Kergosien, B., Le Gonidec, Y., Lesparre, N., Marteau, J., Moretti, R., Nicollin, F., Rosas-Carbajal, M., Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), CEA Grenoble, Université de Strasbourg (UNISTRA), László Oláh, Hiroyuki K. M, and Tanaka Dezső Varga

Subjects
Gravimetry, Fumerole temperature, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Geophysical method, [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology, Electrical resistivity tomography, Seismic monitoring, Volcanic hydrothermal systems, Muon tomography
Abstract

International audience; Muography uses muons contained in the natural cosmic rays to determine the density of rock volumes. The measurements consist of counting the muons emerging from the target to determine the screening effect produced by the rock. Since the larger the rock thickness, the smaller the number of muons able to cross, the time resolution that can be achieved by muography to monitor density changes is on the order of one or two weeks for kilometer-sized volcanoes. This limitation of the method can be reduced by joining muography with high time-resolution measurements like passive seismic monitoring. In the case of structural imaging, muography benefits from the fact that muon trajectories are linear, making the tomography problem simpler than for other geophysical techniques like electrical resistivity tomography. Experiments performed on La Soufrière of Guadeloupe volcano are described to show how muography can be used to contribute to structural imaging of a highly heterogeneous lava dome and to detect abrupt transient hydrothermal phenomena likely to produce dangerous explosive events.

Published
2022
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