FN Archimer Export Format
PT J
TI Exploring the link between large earthquakes and magma transport at the onset of the Mayotte volcano-seismic crisis
BT 
AF Morales-Yáñez, Catalina
   Duputel, Zacharie
   Rivera, Luis
AS 1:1,2;2:3,4;3:1;
FF 1:;2:;3:;
C1 Institut Terre et Environnement de Strasbourg, UMR7063, Université de Strasbourg/EOST, CNRS, Strasbourg, France
   Department of Civil Engineering, Universidad Católica de la Santísima Concepción, Concepción, Chile
   Observatoire Volcanologique du Piton de la Fournaise, Université de Paris, Institut de Physique du Globe de Paris, CNRS, F-75005, Paris, France
   Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005 Paris, France
C2 UNIV STRASBOURG, FRANCE
   UNIV CATOLICA SANTISIMA CONCEPCION, CHILE
   UNIV PARIS, FRANCE
   UNIV PARIS, FRANCE
IF 1.4
TC 1
UR https://archimer.ifremer.fr/doc/00800/91224/96973.pdf
   https://archimer.ifremer.fr/doc/00800/91224/96974.pdf
LA English
DT Article
CR MAYOBS1
BO Marion Dufresne
DE ;Mayotte;Volcano seismology;Moment tensor inversion;3D-Green functions;Volcanotectonic earthquakes
AB The archipelago of Comoros was generally considered a moderately seismic region. However, since May 2018, unusual seismicity has been observed off the east coast of Mayotte Island. Following this increase of seismic activity, oceanographic campaigns led to the discovery of a new submarine volcano, indicating that the observed seismicity had a volcanic origin. In this study, we estimate Centroid Moment Tensor (CMT) solutions of earthquakes of this sequence using 3D Green’s functions and analyze their non-double-couple (non-DC) components. Consistently with previous reports, our results indicate that seismicity migrated upward in May–June 2018 with an increasing number of non-DC events. We show that non-DC components observed in our solutions and previously published catalogs cannot correspond to dike opening or closing as the observed rupture durations suggest unrealistically large magma flow rates. Given that waveforms can be relatively well explained with pure-shear sources, we postulate that non-DC components are most likely artifacts due to unmodeled shallow structural heterogeneities. Most earthquakes have a strike-slip mechanism consistent with the rupture of pre-existing faults loaded by the regional stress regime and triggered by the increment of stress produced by the upward magma transfer. 
PY 2022
SO Comptes Rendus Geoscience
SN 1631-0713
PU Cellule MathDoc/CEDRAM
VL 354
IS S2
UT 000929986500008
BP 137
EP 152
DI 10.5802/crgeos.150
ID 91224
ER

EF