Earthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanics

The physical mechanism of intermediate-depth earthquakes is still under debate. In contrast to conditions in the crust and shallow lithosphere, at temperatures and pressures corresponding to depths > 50 km, rocks ought to yield by creep or flow rather than brittle failure. Some physical process h...

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Tipo de recurso:
Fecha de publicación:
2012
Institución:
Universidad del Rosario
Repositorio:
Repositorio EdocUR - U. Rosario
Idioma:
eng
OAI Identifier:
oai:repository.urosario.edu.co:10336/28475
Acceso en línea:
https://doi.org/10.1016/j.tecto.2012.07.019
https://repository.urosario.edu.co/handle/10336/28475
Palabra clave:
Intermediate-depth earthquakes
Earthquake nests
Earthquake clustering
Rupture mechanism
Earthquake location
Stress drops
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License
Restringido (Acceso a grupos específicos)
id EDOCUR2_e26e6716c9011b40a74610219d3c9a6d
oai_identifier_str oai:repository.urosario.edu.co:10336/28475
network_acronym_str EDOCUR2
network_name_str Repositorio EdocUR - U. Rosario
repository_id_str
spelling 54d3cf55-abf5-4c96-969b-892f39e5c062-1658e0bc4-9060-43f3-9296-c95dfb435c7e-1c448d8d7-1c5d-4168-987f-7bd7b7d14c0c-18d8bf210-527f-4752-9ae3-e8017d9e6151-146da89a2-283e-41dc-bc18-a8a3ed0b2302-12020-08-28T15:48:16Z2020-08-28T15:48:16Z2012-10-10The physical mechanism of intermediate-depth earthquakes is still under debate. In contrast to conditions in the crust and shallow lithosphere, at temperatures and pressures corresponding to depths > 50 km, rocks ought to yield by creep or flow rather than brittle failure. Some physical process has to enable brittle or brittle-like failure for intermediate-depth earthquakes. The two leading candidates for that are dehydration embrittlement and thermal shear runaway. Given their great depth, intermediate-depth earthquake processes can't be observed directly. Instead we must rely on a combination of seismology and the study of laboratory analogs to understand them. Earthquake nests are regions of highly concentrated seismicity that are isolated from nearby activity. In this paper we focus on three intermediate-depth earthquake nests — Vrancea, Hindu Kush and Bucaramanga, and what they reveal about the mechanics of intermediate-depth earthquakes. We review published studies of tectonic setting, focal mechanisms, precise earthquake locations and earthquake source physics at these locations, with an emphasis on the Bucaramanga nest. All three nests are associated with subducting lithosphere and at least two of the nests have consistently larger stress drops compared to shallow seismicity. In contrast, the Bucaramanga nest has a larger b-value, larger variability of focal mechanisms and shows no evidence of aftershock sequences unlike the other two. We also report for the first time finding a significant number of repeating earthquakes, some with reverse polarity. Given the nature and characteristics of earthquake nests, they can be thought as natural laboratories. Future seismological studies of intermediate-depth earthquakes in nests will likely enlighten our understanding of their physical mechanisms.application/pdfhttps://doi.org/10.1016/j.tecto.2012.07.019ISSN: 0040-1951EISSN: 1879-3266https://repository.urosario.edu.co/handle/10336/28475engElsevier5642TectonophysicsVol. 570-571Tectonophysics, ISSN: 0040-1951;EISSN: 1879-3266, Vol. 570-571 (10 October 2012); pp. 42-56https://www.sciencedirect.com/science/article/abs/pii/S0040195112004374Restringido (Acceso a grupos específicos)http://purl.org/coar/access_right/c_16ecTectonophysicsinstname:Universidad del Rosarioreponame:Repositorio Institucional EdocURIntermediate-depth earthquakesEarthquake nestsEarthquake clusteringRupture mechanismEarthquake locationStress dropsEarthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanicsNidos sísmicos como laboratorios naturales para el estudio de la mecánica sísmica de profundidad intermediaarticleArtículohttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501Prieto, Germán A.Beroza, Gregory C.Barrett, Sarah A.López, Gabriel A.Florez, Manuel10336/28475oai:repository.urosario.edu.co:10336/284752021-06-03 00:49:49.858https://repository.urosario.edu.coRepositorio institucional EdocURedocur@urosario.edu.co
dc.title.spa.fl_str_mv Earthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanics
dc.title.TranslatedTitle.spa.fl_str_mv Nidos sísmicos como laboratorios naturales para el estudio de la mecánica sísmica de profundidad intermedia
title Earthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanics
spellingShingle Earthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanics
Intermediate-depth earthquakes
Earthquake nests
Earthquake clustering
Rupture mechanism
Earthquake location
Stress drops
title_short Earthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanics
title_full Earthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanics
title_fullStr Earthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanics
title_full_unstemmed Earthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanics
title_sort Earthquake nests as natural laboratories for the study of intermediate-depth earthquake mechanics
dc.subject.keyword.spa.fl_str_mv Intermediate-depth earthquakes
Earthquake nests
Earthquake clustering
Rupture mechanism
Earthquake location
Stress drops
topic Intermediate-depth earthquakes
Earthquake nests
Earthquake clustering
Rupture mechanism
Earthquake location
Stress drops
description The physical mechanism of intermediate-depth earthquakes is still under debate. In contrast to conditions in the crust and shallow lithosphere, at temperatures and pressures corresponding to depths > 50 km, rocks ought to yield by creep or flow rather than brittle failure. Some physical process has to enable brittle or brittle-like failure for intermediate-depth earthquakes. The two leading candidates for that are dehydration embrittlement and thermal shear runaway. Given their great depth, intermediate-depth earthquake processes can't be observed directly. Instead we must rely on a combination of seismology and the study of laboratory analogs to understand them. Earthquake nests are regions of highly concentrated seismicity that are isolated from nearby activity. In this paper we focus on three intermediate-depth earthquake nests — Vrancea, Hindu Kush and Bucaramanga, and what they reveal about the mechanics of intermediate-depth earthquakes. We review published studies of tectonic setting, focal mechanisms, precise earthquake locations and earthquake source physics at these locations, with an emphasis on the Bucaramanga nest. All three nests are associated with subducting lithosphere and at least two of the nests have consistently larger stress drops compared to shallow seismicity. In contrast, the Bucaramanga nest has a larger b-value, larger variability of focal mechanisms and shows no evidence of aftershock sequences unlike the other two. We also report for the first time finding a significant number of repeating earthquakes, some with reverse polarity. Given the nature and characteristics of earthquake nests, they can be thought as natural laboratories. Future seismological studies of intermediate-depth earthquakes in nests will likely enlighten our understanding of their physical mechanisms.
publishDate 2012
dc.date.created.spa.fl_str_mv 2012-10-10
dc.date.accessioned.none.fl_str_mv 2020-08-28T15:48:16Z
dc.date.available.none.fl_str_mv 2020-08-28T15:48:16Z
dc.type.eng.fl_str_mv article
dc.type.coarversion.fl_str_mv http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.coar.fl_str_mv http://purl.org/coar/resource_type/c_6501
dc.type.spa.spa.fl_str_mv Artículo
dc.identifier.doi.none.fl_str_mv https://doi.org/10.1016/j.tecto.2012.07.019
dc.identifier.issn.none.fl_str_mv ISSN: 0040-1951
EISSN: 1879-3266
dc.identifier.uri.none.fl_str_mv https://repository.urosario.edu.co/handle/10336/28475
url https://doi.org/10.1016/j.tecto.2012.07.019
https://repository.urosario.edu.co/handle/10336/28475
identifier_str_mv ISSN: 0040-1951
EISSN: 1879-3266
dc.language.iso.spa.fl_str_mv eng
language eng
dc.relation.citationEndPage.none.fl_str_mv 56
dc.relation.citationStartPage.none.fl_str_mv 42
dc.relation.citationTitle.none.fl_str_mv Tectonophysics
dc.relation.citationVolume.none.fl_str_mv Vol. 570-571
dc.relation.ispartof.spa.fl_str_mv Tectonophysics, ISSN: 0040-1951;EISSN: 1879-3266, Vol. 570-571 (10 October 2012); pp. 42-56
dc.relation.uri.spa.fl_str_mv https://www.sciencedirect.com/science/article/abs/pii/S0040195112004374
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_16ec
dc.rights.acceso.spa.fl_str_mv Restringido (Acceso a grupos específicos)
rights_invalid_str_mv Restringido (Acceso a grupos específicos)
http://purl.org/coar/access_right/c_16ec
dc.format.mimetype.none.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv Elsevier
dc.source.spa.fl_str_mv Tectonophysics
institution Universidad del Rosario
dc.source.instname.none.fl_str_mv instname:Universidad del Rosario
dc.source.reponame.none.fl_str_mv reponame:Repositorio Institucional EdocUR
repository.name.fl_str_mv Repositorio institucional EdocUR
repository.mail.fl_str_mv edocur@urosario.edu.co
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