Drainage of a deep magma reservoir near Mayotte inferred from seismicity and 
deformation

Cesca, Simone; Letort, J.; Razafindrakoto, H.; Heimann, Sebastian; Rivalta, E.; Isken, M.; Nikkhoo, M.; Passarelli, L.; Petersen, G.; Cotton, Fabrice; Dahm, T.

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Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation

Authors

/persons/resource/cesca

Cesca, Simone
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Letort, J.
External Organizations;

/persons/resource/hoby

Razafindrakoto, H.
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/heimann

Heimann, Sebastian
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/rivalta

Rivalta, E.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Isken, M.
External Organizations;

/persons/resource/mehdi

Nikkhoo, M.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Passarelli, L.
External Organizations;

/persons/resource/gesap

Petersen, G.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/fcotton

Cotton, Fabrice
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/dahm

Dahm, T.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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https://dgg2020.smart-abstract.com/sessionplanner/#/event/16777
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cescaetal_dgg2020.mp4
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cescaetal_dgg2020_animation.mp4
(Supplementary material), 19MB

Citation

Cesca, S., Letort, J., Razafindrakoto, H., Heimann, S., Rivalta, E., Isken, M., Nikkhoo, M., Passarelli, L., Petersen, G., Cotton, F., Dahm, T. (2020): Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation - Abstracts, 80. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (München 2020).

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5001850

Abstract

Since May 2018, a seismically quiet area offshore the island of Mayotte, Comoros archipelago, has been affected by a complex seismic sequence, including a massive swarm of thousands of earthquakes, long-duration very long period (VLP) signals recorded globally and a large surface deflation recorded by GNSS stations on Mayotte. We systematically analysed regional and global seismological data and local deformation data to provide a detailed picture of a deep, rare magmatic process without any on-site monitoring. We identify and locate ~7000 volcano-tectonic earthquakes (VT) and more than 400 VLPs, and determine the geometry of both faulting and the magma reservoir. Early VTs migrated upward in response to a magmatic dike propagating from Moho depth to the surface, while later events marked the progressive failure of the reservoir’s roof thus triggering its resonance. VLP and deformation analysis suggest that a 10–15 km diameter magmatic body has lost at least 1.3 km3 of magma. This episode represents the deepest monitored drainage of a large reservoir initiating the partial collapse of its roof.