Mean magnitude variations of earthquakes as a function of depth: Different crustal stress distribution depending on tectonic setting
International audience The mean magnitude of earthquakes in the Gulf of Corinth is found to increase strongly with depth (b-value decreases), whereas the dip of fault planes decreases. The b-value difference of 0.25, between shallow and deep earthquake distributions, is based on about 7,000 events a...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2008
|
Subjects: | |
Online Access: | https://hal.science/hal-00407889 https://hal.science/hal-00407889/document https://hal.science/hal-00407889/file/2008_Wyss%20et%20al%20GRL.pdf https://doi.org/10.1029/2007GL031057 |
id |
ftunivcotedazur:oai:HAL:hal-00407889v1 |
---|---|
record_format |
openpolar |
spelling |
ftunivcotedazur:oai:HAL:hal-00407889v1 2024-05-19T07:42:46+00:00 Mean magnitude variations of earthquakes as a function of depth: Different crustal stress distribution depending on tectonic setting Wyss, M. Pacchiani, F. Deschamps, Anne Patau, G. World Agency of Planetary Monitoring and Earthquake Risk Reduction (WAPMERR) Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Géoazur (GEOAZUR 6526) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS) Département de sismologie Institut de Physique du Globe de Paris (IPG Paris) 2008 https://hal.science/hal-00407889 https://hal.science/hal-00407889/document https://hal.science/hal-00407889/file/2008_Wyss%20et%20al%20GRL.pdf https://doi.org/10.1029/2007GL031057 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2007GL031057 hal-00407889 https://hal.science/hal-00407889 https://hal.science/hal-00407889/document https://hal.science/hal-00407889/file/2008_Wyss%20et%20al%20GRL.pdf doi:10.1029/2007GL031057 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00407889 Geophysical Research Letters, 2008, 35 (1), pp.L01307. ⟨10.1029/2007GL031057⟩ http://onlinelibrary.wiley.com/doi/10.1029/2007GL031057/epdf [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 2008 ftunivcotedazur https://doi.org/10.1029/2007GL03105710.1029/2007GL031057/epdf 2024-04-25T01:22:58Z International audience The mean magnitude of earthquakes in the Gulf of Corinth is found to increase strongly with depth (b-value decreases), whereas the dip of fault planes decreases. The b-value difference of 0.25, between shallow and deep earthquake distributions, is based on about 7,000 events and therefore is statistically highly significant. The same is true in California, but opposite patterns are observed in southern Iceland and in western Nagano, Japan. Because large mean magnitudes (low b-values) are indicative of relatively high stress levels, we propose that in the detachment layer at about 9 ± 2 km depth, earthquakes are generated at higher stresses than in the shallower parts of the crust. The correlation of low b-values with low faulting dips can be taken as line of evidence that low b-values map high stress regimes. Article in Journal/Newspaper Iceland HAL Université Côte d'Azur Geophysical Research Letters 35 1 |
institution |
Open Polar |
collection |
HAL Université Côte d'Azur |
op_collection_id |
ftunivcotedazur |
language |
English |
topic |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Wyss, M. Pacchiani, F. Deschamps, Anne Patau, G. Mean magnitude variations of earthquakes as a function of depth: Different crustal stress distribution depending on tectonic setting |
topic_facet |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience The mean magnitude of earthquakes in the Gulf of Corinth is found to increase strongly with depth (b-value decreases), whereas the dip of fault planes decreases. The b-value difference of 0.25, between shallow and deep earthquake distributions, is based on about 7,000 events and therefore is statistically highly significant. The same is true in California, but opposite patterns are observed in southern Iceland and in western Nagano, Japan. Because large mean magnitudes (low b-values) are indicative of relatively high stress levels, we propose that in the detachment layer at about 9 ± 2 km depth, earthquakes are generated at higher stresses than in the shallower parts of the crust. The correlation of low b-values with low faulting dips can be taken as line of evidence that low b-values map high stress regimes. |
author2 |
World Agency of Planetary Monitoring and Earthquake Risk Reduction (WAPMERR) Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Géoazur (GEOAZUR 6526) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS) Département de sismologie Institut de Physique du Globe de Paris (IPG Paris) |
format |
Article in Journal/Newspaper |
author |
Wyss, M. Pacchiani, F. Deschamps, Anne Patau, G. |
author_facet |
Wyss, M. Pacchiani, F. Deschamps, Anne Patau, G. |
author_sort |
Wyss, M. |
title |
Mean magnitude variations of earthquakes as a function of depth: Different crustal stress distribution depending on tectonic setting |
title_short |
Mean magnitude variations of earthquakes as a function of depth: Different crustal stress distribution depending on tectonic setting |
title_full |
Mean magnitude variations of earthquakes as a function of depth: Different crustal stress distribution depending on tectonic setting |
title_fullStr |
Mean magnitude variations of earthquakes as a function of depth: Different crustal stress distribution depending on tectonic setting |
title_full_unstemmed |
Mean magnitude variations of earthquakes as a function of depth: Different crustal stress distribution depending on tectonic setting |
title_sort |
mean magnitude variations of earthquakes as a function of depth: different crustal stress distribution depending on tectonic setting |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00407889 https://hal.science/hal-00407889/document https://hal.science/hal-00407889/file/2008_Wyss%20et%20al%20GRL.pdf https://doi.org/10.1029/2007GL031057 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00407889 Geophysical Research Letters, 2008, 35 (1), pp.L01307. ⟨10.1029/2007GL031057⟩ http://onlinelibrary.wiley.com/doi/10.1029/2007GL031057/epdf |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007GL031057 hal-00407889 https://hal.science/hal-00407889 https://hal.science/hal-00407889/document https://hal.science/hal-00407889/file/2008_Wyss%20et%20al%20GRL.pdf doi:10.1029/2007GL031057 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2007GL03105710.1029/2007GL031057/epdf |
container_title |
Geophysical Research Letters |
container_volume |
35 |
container_issue |
1 |
_version_ |
1799482460191326208 |