Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation
Simone Cesca,Jean Letort,Hoby N. T. Razafindrakoto,Sebastian Heimann,Eleonora Rivalta,Marius Isken,Mehdi Nikkhoo,Luigi Passarelli,Gesa Petersen,Fabrice Cotton,Torsten Dahm +10 more
TLDR
In this article, the authors analyzed regional and global seismic and deformation data to provide a one-year-long detailed picture of a deep, rare magmatic process and identified about 7,000 volcano-tectonic earthquakes and 407 very-long-period seismic signals.Abstract:
The dynamics of magma deep in the Earth’s crust are difficult to capture by geophysical monitoring. Since May 2018, a seismically quiet area offshore of Mayotte in the western Indian Ocean has been affected by complex seismic activity, including long-duration, very-long-period signals detected globally. Global Navigation Satellite System stations on Mayotte have also recorded a large surface deflation offshore. Here we analyse regional and global seismic and deformation data to provide a one-year-long detailed picture of a deep, rare magmatic process. We identify about 7,000 volcano-tectonic earthquakes and 407 very-long-period seismic signals. Early earthquakes migrated upward in response to a magmatic dyke propagating from Moho depth to the surface, whereas later events marked the progressive failure of the roof of a magma reservoir, triggering its resonance. An analysis of the very-long-period seismicity and deformation suggests that at least 1.3 km3 of magma drained from a reservoir of 10 to 15 km diameter at 25 to 35 km depth. We demonstrate that such deep offshore magmatic activity can be captured without any on-site monitoring. Recent seismicity near Mayotte in the Indian Ocean is due to dyke propagation from and drainage of a 25–35 km deep magma reservoir, according to an analysis of earthquake and deformation data.read more
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The 2018–2019 seismo-volcanic crisis east of Mayotte, Comoros islands: seismicity and ground deformation markers of an exceptional submarine eruption
Anne Lemoine,Pierre Briole,Didier Bertil,Agathe Roullé,Michael Foumelis,Isabelle Thinon,Daniel Raucoules,Marcello de Michele,P. Valty,Roser Hoste Colomer +9 more
TL;DR: In this article, the authors describe the onset and evolution of a large volcanic event thanks to the analysis of the seismicity from the initiation of the crisis through its first year, compared to the ground deformation observation (GNSS and InSAR) and modelling.
Journal ArticleDOI
Unexpected large eruptions from buoyant magma bodies within viscoelastic crust.
Freysteinn Sigmundsson,Virginie Pinel,Ronni Grapenthin,Andrew Hooper,Sæmundur A. Halldórsson,Páll Einarsson,Benedikt G. Ófeigsson,Elías Rafn Heimisson,Kristín Jónsdóttir,Magnús T. Gudmundsson,Kristín Vogfjörd,Michelle Parks,Siqi Li,Vincent Drouin,Halldór Geirsson,Stéphanie Dumont,Hildur M. Fridriksdottir,Gunnar B. Gudmundsson,Tim J. Wright,Tadashi Yamasaki +19 more
TL;DR: It is shown that modelling the combined effects of buoyant magma, viscoelastic earth behaviour, and sustained magma channels can explain such behaviour of volcanoes and gives an estimate of pressure evolution in magma bodies.
Journal ArticleDOI
A Python framework for efficient use of pre-computed Green's functions in seismological and other physical forward and inverse source problems
Sebastian Heimann,Hannes Vasyura-Bathke,Hannes Vasyura-Bathke,Henriette Sudhaus,Marius Isken,Marius Isken,Marius Kriegerowski,Marius Kriegerowski,Andreas Steinberg,Torsten Dahm +9 more
TL;DR: Pyrocko-GF defines an extensible GF storage format suitable for a wide range of GF types, especially handling elasticity and wave propagation problems, which is supported through an online platform that provides many pre-calculated GF stores for local, regional, and global studies.
Journal ArticleDOI
Birth of a large volcanic edifice offshore Mayotte via lithosphere-scale dyke intrusion
Nathalie Feuillet,Stephan J. Jorry,Wayne C Crawford,Christine Deplus,Isabelle Thinon,Eric Jacques,Jean Marie Saurel,Anne Lemoine,Fabien Paquet,Claudio Satriano,Chastity Aiken,Océane Foix,Philippe Kowalski,Angèle Laurent,Emmanuel Rinnert,Cecile Cathalot,Jean-Pierre Donval,Vivien Guyader,Arnaud Gaillot,Carla Scalabrin,Manuel A. Moreira,Manuel A. Moreira,Aline Peltier,François Beauducel,François Beauducel,Raphaël Grandin,Valérie Ballu,R. Daniel,Pascal Pelleau,J. Gomez,Simon Besançon,Louis Géli,Pascal Bernard,Patrick Bachèlery,Yves Fouquet,Didier Bertil,Arnaud Lemarchand,Jérôme Van der Woerd +37 more
TL;DR: In this paper, the authors present geophysical and marine data from the MAYOBS1 cruise, which reveal that by May 2019, this activity formed an 820m-tall, 5'km³ volcanic edifice on the seafloor.
Journal ArticleDOI
The Comoros archipelago: a right-lateral transform boundary between the Somalia and Lwandle plates
TL;DR: In this article, a formal stress inversion of earthquake focal mechanisms and deformation structures (faults and dykes) observed on three islands (Mayotte, Anjouan, and Moheli) with a morphologic study of the repartition of onshore and offshore volcanic vents in the area was performed.
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