Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context
International audience The seismicity of the North Atlantic was monitored from May 2002 to September 2003 by the 'SIRENA array' of autonomous hydrophones. The hydroacoustic signals provide a unique data set documenting numerous low-magnitude earthquakes along the section of the Mid-Atlanti...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2012
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Subjects: | |
Online Access: | https://hal-insu.archives-ouvertes.fr/insu-00681683 https://hal-insu.archives-ouvertes.fr/insu-00681683/document https://hal-insu.archives-ouvertes.fr/insu-00681683/file/G3-Goslin-2012.pdf https://doi.org/10.1029/2011GC003828 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
zores hot spot-ridge interaction autonomous hydrophone seismicity spreading center [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
zores hot spot-ridge interaction autonomous hydrophone seismicity spreading center [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes Goslin, Jean Perrot, Julie Royer, Jean-Yves Martin, Christophe Lourenço, Nuno Luis, J. Dziak, R. P. Matsumoto, H. Fowler, M.J. Fox, C.G. Lau, A.T.-K. Bazin, S. Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context |
topic_facet |
zores hot spot-ridge interaction autonomous hydrophone seismicity spreading center [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The seismicity of the North Atlantic was monitored from May 2002 to September 2003 by the 'SIRENA array' of autonomous hydrophones. The hydroacoustic signals provide a unique data set documenting numerous low-magnitude earthquakes along the section of the Mid-Atlantic Ridge (MAR) located in a ridge-hot spot interaction context. During the experiment, 1696 events were detected along the MAR axis between 40°N and 51°N, with a magnitude of completeness level of mb ≈ 2.4. Inside the array, location errors are in the order of 2 km, and errors in the origin time are less than 1 s. From this catalog, 15 clusters were detected. The distribution of source level (SL) versus time within each cluster is used to discriminate clusters occurring in a tectonic context from those attributed to non-tectonic (i.e. volcanic or hydrothermal) processes. The location of tectonic and non-tectonic sequences correlates well with regions with positive and negative Mantle Bouguer Anomalies (MBAs), indicating the presence of thinner/colder and thicker/warmer crust respectively. At the scale of the entire array, both the complete and declustered catalogs derived from the hydroacoustic signals show an increase of the seismicity rate from the Azores up to 43°30′N suggesting a diminishing influence of the Azores hot spot on the ridge-axis temperature, and well correlated with a similar increase in the along-axis MBAs. The comparison of the MAR seismicity with the Residual MBA (RMBA) at different scales leads us to think that the low-magnitude seismicity rates are directly related to along-axis variations in lithosphere rheology and temperatures. |
author2 |
Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Estrutura de Missão para a Extensão da Plataforma Continental Estrutura de Missão para a Extensão para a Extensão da Plataforma Continental Centro de Investigação Marinha e Ambiental (CIMA) Universidade do Algarve (UAlg) NOAA Pacific Marine Environmental Laboratory Newport (PMEL) National Oceanic and Atmospheric Administration (NOAA) NOAA National Geophysical Data Center (NGDC) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Norwegian Geotechnical Institute (NGI) |
format |
Article in Journal/Newspaper |
author |
Goslin, Jean Perrot, Julie Royer, Jean-Yves Martin, Christophe Lourenço, Nuno Luis, J. Dziak, R. P. Matsumoto, H. Fowler, M.J. Fox, C.G. Lau, A.T.-K. Bazin, S. |
author_facet |
Goslin, Jean Perrot, Julie Royer, Jean-Yves Martin, Christophe Lourenço, Nuno Luis, J. Dziak, R. P. Matsumoto, H. Fowler, M.J. Fox, C.G. Lau, A.T.-K. Bazin, S. |
author_sort |
Goslin, Jean |
title |
Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context |
title_short |
Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context |
title_full |
Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context |
title_fullStr |
Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context |
title_full_unstemmed |
Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context |
title_sort |
spatiotemporal distribution of the seismicity along the mid-atlantic ridge north of the azores from hydroacoustic data: insights into seismogenic processes in a ridge-hot spot context |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00681683 https://hal-insu.archives-ouvertes.fr/insu-00681683/document https://hal-insu.archives-ouvertes.fr/insu-00681683/file/G3-Goslin-2012.pdf https://doi.org/10.1029/2011GC003828 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-00681683 Geochemistry, Geophysics, Geosystems, 2012, 13 (2), pp.Q02010. ⟨10.1029/2011GC003828⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2011GC003828 insu-00681683 https://hal-insu.archives-ouvertes.fr/insu-00681683 https://hal-insu.archives-ouvertes.fr/insu-00681683/document https://hal-insu.archives-ouvertes.fr/insu-00681683/file/G3-Goslin-2012.pdf doi:10.1029/2011GC003828 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2011GC003828 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
13 |
container_issue |
2 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766136563728646144 |
spelling |
ftunivnantes:oai:HAL:insu-00681683v1 2023-05-15T17:36:55+02:00 Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context Goslin, Jean Perrot, Julie Royer, Jean-Yves Martin, Christophe Lourenço, Nuno Luis, J. Dziak, R. P. Matsumoto, H. Fowler, M.J. Fox, C.G. Lau, A.T.-K. Bazin, S. Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Estrutura de Missão para a Extensão da Plataforma Continental Estrutura de Missão para a Extensão para a Extensão da Plataforma Continental Centro de Investigação Marinha e Ambiental (CIMA) Universidade do Algarve (UAlg) NOAA Pacific Marine Environmental Laboratory Newport (PMEL) National Oceanic and Atmospheric Administration (NOAA) NOAA National Geophysical Data Center (NGDC) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Norwegian Geotechnical Institute (NGI) 2012-02-24 https://hal-insu.archives-ouvertes.fr/insu-00681683 https://hal-insu.archives-ouvertes.fr/insu-00681683/document https://hal-insu.archives-ouvertes.fr/insu-00681683/file/G3-Goslin-2012.pdf https://doi.org/10.1029/2011GC003828 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2011GC003828 insu-00681683 https://hal-insu.archives-ouvertes.fr/insu-00681683 https://hal-insu.archives-ouvertes.fr/insu-00681683/document https://hal-insu.archives-ouvertes.fr/insu-00681683/file/G3-Goslin-2012.pdf doi:10.1029/2011GC003828 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-00681683 Geochemistry, Geophysics, Geosystems, 2012, 13 (2), pp.Q02010. ⟨10.1029/2011GC003828⟩ zores hot spot-ridge interaction autonomous hydrophone seismicity spreading center [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2012 ftunivnantes https://doi.org/10.1029/2011GC003828 2023-02-08T00:31:41Z International audience The seismicity of the North Atlantic was monitored from May 2002 to September 2003 by the 'SIRENA array' of autonomous hydrophones. The hydroacoustic signals provide a unique data set documenting numerous low-magnitude earthquakes along the section of the Mid-Atlantic Ridge (MAR) located in a ridge-hot spot interaction context. During the experiment, 1696 events were detected along the MAR axis between 40°N and 51°N, with a magnitude of completeness level of mb ≈ 2.4. Inside the array, location errors are in the order of 2 km, and errors in the origin time are less than 1 s. From this catalog, 15 clusters were detected. The distribution of source level (SL) versus time within each cluster is used to discriminate clusters occurring in a tectonic context from those attributed to non-tectonic (i.e. volcanic or hydrothermal) processes. The location of tectonic and non-tectonic sequences correlates well with regions with positive and negative Mantle Bouguer Anomalies (MBAs), indicating the presence of thinner/colder and thicker/warmer crust respectively. At the scale of the entire array, both the complete and declustered catalogs derived from the hydroacoustic signals show an increase of the seismicity rate from the Azores up to 43°30′N suggesting a diminishing influence of the Azores hot spot on the ridge-axis temperature, and well correlated with a similar increase in the along-axis MBAs. The comparison of the MAR seismicity with the Residual MBA (RMBA) at different scales leads us to think that the low-magnitude seismicity rates are directly related to along-axis variations in lithosphere rheology and temperatures. Article in Journal/Newspaper North Atlantic Université de Nantes: HAL-UNIV-NANTES Mid-Atlantic Ridge Geochemistry, Geophysics, Geosystems 13 2 n/a n/a |