FN Archimer Export Format
PT J
TI Mapping the geometry of volcanic systems with magnetotelluric soundings: Results from a land and marine magnetotelluric survey performed during the 2018–2019 Mayotte seismovolcanic crisis
BT 
AF Darnet, M.
   Wawrzyniak, P.
   Tarits, Pascal
   Hautot, S.
   D'Eu, J.F.
AS 1:1;2:1;3:2,3,4;4:3;5:4;
FF 1:;2:;3:;4:;5:;
C1 BRGM, Bureau des Recherches Géologiques et Minières, 3 av. Claude-Guillemin, BP 36009, 45060 Orléans Cedex 2, France
   IUEM, Institut Universitaire Européen de la Mer, LGO, UMR 6538 - IUEM/UBO, Place Nicolas Copernic, Plouzané, 29280, France
   IMAGIR Sarl, Tech-Iroise, ZA de Mespaol 2, 1 rue des Ateliers, 29290 Saint Renan,France
   MAPPEM Geophysics SAS, Marine Electromagnetic Investigation, Batiment Tech-Iroise, 1 rue des Ateliers, Zone de Mespaol, 29290 Saint-Renan, France
C2 BRGM, FRANCE
   UBO, FRANCE
   IMAGIR SARL, FRANCE
   MAPPEM GEOPHYSICS SAS, FRANCE
UM LGO
IF 2.789
TC 10
UR https://archimer.ifremer.fr/doc/00649/76113/77074.pdf
LA English
DT Article
DE ;Magnetotelluric;Electrical resistivity;Seismovolcanic;Geothermal
AB A major seismovolcanic crisis has afflicted the islands of Mayotte, Comoros Archipelago, since May 2018, although the origin is debated. Magnetotellurics (MT), which is sensitive to hydrothermal and/or magmatic fluids and can map the subsurface electrical resistivity structure, can provide insight by revealing the internal structure of the volcanic system. In this paper, we report the results of a preliminary land and shallow marine MT survey performed on and offshore the island nearest the crisis. The 3D inversion-derived electrical resistivity model suggests that the island is underlain by a shallow ~500-m-thick conductive layer atop a deeper, more resistive layer, possibly associated with a high-temperature geothermal system. At depths of ~15 km, the resistivity drops by almost two orders of magnitude, possibly due to partial melting. Further petrophysical and geophysical studies are underway for confirmation and to map the geometry and evolution of the volcanic system. 
PY 2020
PD NOV
SO Journal Of Volcanology And Geothermal Research
SN 0377-0273
PU Elsevier BV
VL 406
UT 000592400000005
DI 10.1016/j.jvolgeores.2020.107046
ID 76113
ER

EF