Hydroacoustic observations of two contrasted seismic swarms along the Southwest Indian Ridge in 2018
| Autor: | Jean-Yves Royer, Sara Bazin, Vaibhav Vijay Ingale |
|---|---|
| Přispěvatelé: | Laboratoire Géosciences Océan (LGO), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Interdisciplinary Graduate School for the Blue planet, ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Dike
010504 meteorology & atmospheric sciences mid-ocean ridge [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] 010502 geochemistry & geophysics Earthquake swarm 01 natural sciences seismic swarm Indian Ocean 0105 earth and related environmental sciences hydroacoustics [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] geography QE1-996.5 geography.geographical_feature_category Triple junction impulsive events Swarm behaviour Crust Mid-ocean ridge Fracture zone Geology Ridge General Earth and Planetary Sciences Seismology |
| Zdroj: | Geosciences Geosciences, MDPI, 2021, 11 (6), pp.225. ⟨10.3390/geosciences11060225⟩ Geosciences, Vol 11, Iss 225, p 225 (2021) Geosciences (2076-3263) (MDPI AG), 2021-06, Vol. 11, N. 6, P. 225 (18p.) Volume 11 Issue 6 |
| ISSN: | 2076-3263 |
| Popis: | International audience; 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 |
| Databáze: | OpenAIRE |
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