Seafloor seismicity, Antarctic ice-sounds, cetacean vocalizations and long-term ambient sound in the Indian Ocean basin
International audience This paper presents the results from the Deflo-hydroacoustic experiment in the Southern Indian Ocean using three autonomous underwater hydrophones, complemented by two permanent hydroacoustic stations. The array monitored for 14 months, from November 2006 to December 2007, a 3...
Published in: | Geophysical Journal International |
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Main Authors: | , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2015
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Subjects: | |
Online Access: | https://hal-insu.archives-ouvertes.fr/insu-01235343 https://hal-insu.archives-ouvertes.fr/insu-01235343/document https://hal-insu.archives-ouvertes.fr/insu-01235343/file/Geophys.%20J.%20Int.-2015-Royer-748-62.pdf https://doi.org/10.1093/gji/ggv178 |
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ftccsdartic:oai:HAL:insu-01235343v1 |
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openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Hydrogeophysics Acoustic properties Mid-ocean ridge processes Indian Ocean [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] |
spellingShingle |
Hydrogeophysics Acoustic properties Mid-ocean ridge processes Indian Ocean [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] Royer, Jean-Yves Chateau, R. Dziak, R. P. Bohnenstiehl, D. R. Seafloor seismicity, Antarctic ice-sounds, cetacean vocalizations and long-term ambient sound in the Indian Ocean basin |
topic_facet |
Hydrogeophysics Acoustic properties Mid-ocean ridge processes Indian Ocean [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] |
description |
International audience This paper presents the results from the Deflo-hydroacoustic experiment in the Southern Indian Ocean using three autonomous underwater hydrophones, complemented by two permanent hydroacoustic stations. The array monitored for 14 months, from November 2006 to December 2007, a 3000 x 3000 km wide area, encompassing large segments of the three Indian spreading ridges that meet at the Indian Triple Junction. A catalogue of 11 105 acoustic events is derived from the recorded data, of which 55 per cent are located from three hydrophones, 38 per cent from 4, 6 per cent from five and less than 1 per cent by six hydrophones. From a comparison with land-based seismic catalogues, the smallest detected earthquakes are m(b) 2.6 in size, the range of recorded magnitudes is about twice that of land-based networks and the number of detected events is 5-16 times larger. Seismicity patterns vary between the three spreading ridges, with activity mainly focused on transform faults along the fast spreading Southeast Indian Ridge and more evenly distributed along spreading segments and transforms on the slow spreading Central and ultra-slow spreading Southwest Indian ridges; the Central Indian Ridge is the most active of the three with an average of 1.9 events/100 km/month. Along the Sunda Trench, acoustic events mostly radiate from the inner wall of the trench and show a 200-km-long seismic gap between 2 degrees S and the Equator. The array also detected more than 3600 cryogenic events, with different seasonal trends observed for events from the Antarctic margin, compared to those from drifting icebergs at lower (up to 50 degrees S) latitudes. Vocalizations of five species and subspecies of large baleen whales were also observed and exhibit clear seasonal variability. On the three autonomous hydrophones, whale vocalizations dominate sound levels in the 20-30 and 100 Hz frequency bands, whereas earthquakes and ice tremor are a dominant source of ambient sound at frequencies < 20 Hz. |
author2 |
Domaines Océaniques (LDO) Centre National de la Recherche Scientifique (CNRS)-Institut d'écologie et environnement-Observatoire des Sciences de l'Univers-Université de Brest (UBO)-Institut national des sciences de l'Univers (INSU - CNRS) NOAA Pacific Marine Environmental Laboratory Newport (PMEL) National Oceanic and Atmospheric Administration (NOAA) North Carolina State University Raleigh (NC State) University of North Carolina System (UNC) NOAA Ocean Exploration and Research Program VT95B-OP2008/1 French Polar Institute (IPEV) VT94-MD157 VT95A-MD165 |
format |
Article in Journal/Newspaper |
author |
Royer, Jean-Yves Chateau, R. Dziak, R. P. Bohnenstiehl, D. R. |
author_facet |
Royer, Jean-Yves Chateau, R. Dziak, R. P. Bohnenstiehl, D. R. |
author_sort |
Royer, Jean-Yves |
title |
Seafloor seismicity, Antarctic ice-sounds, cetacean vocalizations and long-term ambient sound in the Indian Ocean basin |
title_short |
Seafloor seismicity, Antarctic ice-sounds, cetacean vocalizations and long-term ambient sound in the Indian Ocean basin |
title_full |
Seafloor seismicity, Antarctic ice-sounds, cetacean vocalizations and long-term ambient sound in the Indian Ocean basin |
title_fullStr |
Seafloor seismicity, Antarctic ice-sounds, cetacean vocalizations and long-term ambient sound in the Indian Ocean basin |
title_full_unstemmed |
Seafloor seismicity, Antarctic ice-sounds, cetacean vocalizations and long-term ambient sound in the Indian Ocean basin |
title_sort |
seafloor seismicity, antarctic ice-sounds, cetacean vocalizations and long-term ambient sound in the indian ocean basin |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01235343 https://hal-insu.archives-ouvertes.fr/insu-01235343/document https://hal-insu.archives-ouvertes.fr/insu-01235343/file/Geophys.%20J.%20Int.-2015-Royer-748-62.pdf https://doi.org/10.1093/gji/ggv178 |
long_lat |
ENVELOPE(110.000,110.000,-50.000,-50.000) ENVELOPE(-6.982,-6.982,62.205,62.205) |
geographic |
Antarctic Indian Southeast Indian Ridge Sunda The Antarctic |
geographic_facet |
Antarctic Indian Southeast Indian Ridge Sunda The Antarctic |
genre |
Antarc* Antarctic baleen whales Iceberg* |
genre_facet |
Antarc* Antarctic baleen whales Iceberg* |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal-insu.archives-ouvertes.fr/insu-01235343 Geophysical Journal International, Oxford University Press (OUP), 2015, 202 (2), pp.748-762. ⟨10.1093/gji/ggv178⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggv178 insu-01235343 https://hal-insu.archives-ouvertes.fr/insu-01235343 https://hal-insu.archives-ouvertes.fr/insu-01235343/document https://hal-insu.archives-ouvertes.fr/insu-01235343/file/Geophys.%20J.%20Int.-2015-Royer-748-62.pdf doi:10.1093/gji/ggv178 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/gji/ggv178 |
container_title |
Geophysical Journal International |
container_volume |
202 |
container_issue |
2 |
container_start_page |
748 |
op_container_end_page |
762 |
_version_ |
1766274024329969664 |
spelling |
ftccsdartic:oai:HAL:insu-01235343v1 2023-05-15T14:03:23+02:00 Seafloor seismicity, Antarctic ice-sounds, cetacean vocalizations and long-term ambient sound in the Indian Ocean basin Royer, Jean-Yves Chateau, R. Dziak, R. P. Bohnenstiehl, D. R. Domaines Océaniques (LDO) Centre National de la Recherche Scientifique (CNRS)-Institut d'écologie et environnement-Observatoire des Sciences de l'Univers-Université de Brest (UBO)-Institut national des sciences de l'Univers (INSU - CNRS) NOAA Pacific Marine Environmental Laboratory Newport (PMEL) National Oceanic and Atmospheric Administration (NOAA) North Carolina State University Raleigh (NC State) University of North Carolina System (UNC) NOAA Ocean Exploration and Research Program VT95B-OP2008/1 French Polar Institute (IPEV) VT94-MD157 VT95A-MD165 2015-08-21 https://hal-insu.archives-ouvertes.fr/insu-01235343 https://hal-insu.archives-ouvertes.fr/insu-01235343/document https://hal-insu.archives-ouvertes.fr/insu-01235343/file/Geophys.%20J.%20Int.-2015-Royer-748-62.pdf https://doi.org/10.1093/gji/ggv178 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggv178 insu-01235343 https://hal-insu.archives-ouvertes.fr/insu-01235343 https://hal-insu.archives-ouvertes.fr/insu-01235343/document https://hal-insu.archives-ouvertes.fr/insu-01235343/file/Geophys.%20J.%20Int.-2015-Royer-748-62.pdf doi:10.1093/gji/ggv178 info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal-insu.archives-ouvertes.fr/insu-01235343 Geophysical Journal International, Oxford University Press (OUP), 2015, 202 (2), pp.748-762. ⟨10.1093/gji/ggv178⟩ Hydrogeophysics Acoustic properties Mid-ocean ridge processes Indian Ocean [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.1093/gji/ggv178 2021-11-28T01:13:17Z International audience This paper presents the results from the Deflo-hydroacoustic experiment in the Southern Indian Ocean using three autonomous underwater hydrophones, complemented by two permanent hydroacoustic stations. The array monitored for 14 months, from November 2006 to December 2007, a 3000 x 3000 km wide area, encompassing large segments of the three Indian spreading ridges that meet at the Indian Triple Junction. A catalogue of 11 105 acoustic events is derived from the recorded data, of which 55 per cent are located from three hydrophones, 38 per cent from 4, 6 per cent from five and less than 1 per cent by six hydrophones. From a comparison with land-based seismic catalogues, the smallest detected earthquakes are m(b) 2.6 in size, the range of recorded magnitudes is about twice that of land-based networks and the number of detected events is 5-16 times larger. Seismicity patterns vary between the three spreading ridges, with activity mainly focused on transform faults along the fast spreading Southeast Indian Ridge and more evenly distributed along spreading segments and transforms on the slow spreading Central and ultra-slow spreading Southwest Indian ridges; the Central Indian Ridge is the most active of the three with an average of 1.9 events/100 km/month. Along the Sunda Trench, acoustic events mostly radiate from the inner wall of the trench and show a 200-km-long seismic gap between 2 degrees S and the Equator. The array also detected more than 3600 cryogenic events, with different seasonal trends observed for events from the Antarctic margin, compared to those from drifting icebergs at lower (up to 50 degrees S) latitudes. Vocalizations of five species and subspecies of large baleen whales were also observed and exhibit clear seasonal variability. On the three autonomous hydrophones, whale vocalizations dominate sound levels in the 20-30 and 100 Hz frequency bands, whereas earthquakes and ice tremor are a dominant source of ambient sound at frequencies < 20 Hz. Article in Journal/Newspaper Antarc* Antarctic baleen whales Iceberg* Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Indian Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) Sunda ENVELOPE(-6.982,-6.982,62.205,62.205) The Antarctic Geophysical Journal International 202 2 748 762 |