FN Archimer Export Format
PT J
TI Hydroacoustic Observations of Two Contrasted Seismic Swarms along the Southwest Indian Ridge in 2018
BT 
AF Ingale, Vaibhav Vijay
   Bazin, Sara
   Royer, Jean-Yves
AS 1:1;2:1;3:1;
FF 1:;2:;3:;
C1 Laboratoire Geosciences Ocean, University of Brest & CNRS, 29280 Plouzané, France
C2 CNRS, FRANCE
SI BREST
SE PDG-REM-GEOOCEAN
   UMR-LGO
UM LGO
IN DOAJ
TC 4
UR https://archimer.ifremer.fr/doc/00820/93152/99730.pdf
   https://archimer.ifremer.fr/doc/00820/93152/99731.zip
LA English
DT Article
CR OHA-SIS-BIO - OBSERVATOIRE HYDROACOUSTIQUE
DE ;seismic swarm;hydroacoustics;mid-ocean ridge;Indian Ocean;impulsive events
AB In 2018, two earthquake swarms occurred along spreading ridge segments of the ultra-slow Southwest Indian Ridge (SWIR). The first swarm was located at the spreading-ridge intersection with the Novara Fracture Zone, comprising 231 events (ISC catalogue) and spanning over 6 days (10 July to 15 July). The second swarm was more of a cluster of events focusing near a discontinuity, 220 km west of the Rodrigues Triple Junction, composed of 92 events and spanning over 31 days (27 September to 27 October). We examined these two swarms using hydroacoustic records from the OHASISBIO network with seven to nine autonomous hydrophones moored on either side of the SWIR. We detected 1109 hydroacoustic events spanning over 13 days (6 July to 18 July) in the first swarm and 4880 events spanning over 33 days in the second swarm (25 September to 27 October). The number of events per day was larger, and the hydroacoustic magnitude (source level) was, on average, smaller during the second swarm than the first. The spatio-temporal distribution of events from both swarms indicates a magmatic origin initiated by dike intrusions and followed by a readjustment of stresses in the surrounding crust. 
PY 2021
PD JUL
SO Geosciences
SN 2076-3263
PU MDPI AG
VL 11
IS 6
UT 000666311800001
DI 10.3390/geosciences11060225
ID 93152
ER

EF