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Characterizing the dynamics of hydrothermal systems with muon tomography: the case of La Soufrière de Guadeloupe

Marina Rosas-Carbajal 1 Jacques Marteau 2 Matias Tramontini 3 Jean de Bremond d'Ars 4 Yves Le Gonidec 4 Bruno Carlus 2 Jean-Christophe Ianigro 2 Sébastien Deroussi 5 Jean-Christophe Komorowski 6 Dominique Gibert 4
1 IPGP - Institut de Physique du Globe de Paris
2 IPNL - Institut de Physique Nucléaire de Lyon
3 UNLP - Universidad Nacional de la Plata [Argentine]
4 GR - Géosciences Rennes
5 Observatoire Volcanologique et sismologique de la Soufrière de Guadeloupe
6 IPGP - Institut de Physique du Globe de Paris
Abstract : Muon imaging has recently emerged as a powerful method to complement standard geophysical tools in the study of the Earth’s subsurface. Muon measurements yield a radiography of the average density along the muon path, allowing to image large volumes of a geological body from a single observation point. Long-term measurements allow to infer density changes by tracking the associated variations in the muon flux. In the context of volcanic hydrothermal systems, this approach helps to characterize zones of steam formation, condensation, water infiltration and storage. We present results of imaging the La Soufrière de Guadeloupe dome and shallow active hydrothermal system with a network of muon telescopes viewing the dome from different positions around its base. First, we jointly invert the muon radiographies of the different telescopes with gravity data to obtain a three-dimensional density model of the lava dome. The model reveals an extended low density region where the hydrothermal system is most active. We then analyze the dynamics of the hydrothermal system from long-term measurements (more than 2 years of almost non-interrupted acquisition) with 5 simultaneous muon telescopes. We identify a periodicity of ~1-2 months in the density increase/decrease in the most active zones below fumaroles and acid boiling ponds. Our simultaneous-muon telescope strategy provides constraints on the three-dimensional location of the density changes and an improved quantification of the associated mass flux changes. We compare the temporal trends acquired by the different muon telescopes to time-series of rainfall on the summit recharge area as well as to ground temperature profiles in the vicinity of thermal anomalies and high-discharge summit fumaroles.
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https://hal-insu.archives-ouvertes.fr/insu-01734852
Contributor : Isabelle Dubigeon <>
Submitted on : Thursday, March 15, 2018 - 10:27:16 AM
Last modification on : Wednesday, June 30, 2021 - 9:40:13 PM

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  • HAL Id : insu-01734852, version 1

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INSU | CNRS | GR | UPMC | UNIV-RENNES1 | USPC | GR-DIMENV | UNIV-LYON1 | OSUR-OSU | OSUR | IN2P3 | UNIV-RENNES | SORBONNE-UNIVERSITE | UNIV-PARIS7 | IP2I | UDL | UNIV-PARIS | AFRIQ | IPGP

Citation

Marina Rosas-Carbajal, Jacques Marteau, Matias Tramontini, Jean de Bremond d'Ars, Yves Le Gonidec, et al.. Characterizing the dynamics of hydrothermal systems with muon tomography: the case of La Soufrière de Guadeloupe . American Geophysical Union Fall Meeting 2017, Dec 2017, New Orleans, United States. pp.V24A-06. ⟨insu-01734852⟩

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