Spatial variation of coda wave attenuation in the Southern Indian Shield and its implications

During the recent past the Indian peninsular shield has experienced six damaging earthquakes of M 5.4-7.7 and compelled to readdress our understanding of the seismic attenuation characteristics for better evaluation of the seismic hazards in the so-called stable shield. We have performed the seismic...

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Autores: Singh, Chandrani, Basha, S. K., Shekar, M., Chadha, R. K.
Tipo de recurso: artículo
Fecha de publicación:2012
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:99656
Acceso en línea:https://ddd.uab.cat/record/99656
https://dx.doi.org/urn:doi:10.1344/105.000001751
Access Level:acceso abierto
Palabra clave:Coda Q
Attenuation characteristics
Indian peninsular shield
Heat flow
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spelling Spatial variation of coda wave attenuation in the Southern Indian Shield and its implicationsSingh, ChandraniBasha, S. K.Shekar, M.Chadha, R. K.Coda QAttenuation characteristicsIndian peninsular shieldHeat flowDuring the recent past the Indian peninsular shield has experienced six damaging earthquakes of M 5.4-7.7 and compelled to readdress our understanding of the seismic attenuation characteristics for better evaluation of the seismic hazards in the so-called stable shield. We have performed the seismic attenuation study using coda waves of the broadband network from 1995 to 2009 for the shield region. About 400 local earthquakes M 2.5-4.0 within an epicentral distance of 250km are used in this study. The broadband seismic stations established are in different geological provinces, such as the Archaean Dharwar craton, the southern granulite terrain, the Proterozoic Cuddapah basin, the Godavari graben, the Cretaceous-Eocene Deccan volcanic province and in the Cambay basin. This allows us to understand the fluctuation of Q0 in terms of spatial variations in the geologic and tectonic provinces. The results reflect a ubiquitous observation of frequency dependence of Qc in the different geologic provinces. The rift basins exhibit lower Q0, which suggests higher attenuation due to a more heterogeneous structure. Higher Q0 in the western Dharwar craton infers lower attenuation. Similarly the Deccan volcanic province is characterized by significantly higher Q0. The results show a good correlation with the observed heat flow. The study fills an important gap in knowledge about the Q factor as well as of crustal attenuation conditions in the whole southern peninsular shield of India. 22012-01-0120122012-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/99656https://dx.doi.org/urn:doi:10.1344/105.000001751reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/3.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:996562026-06-06T12:50:31Z
dc.title.none.fl_str_mv Spatial variation of coda wave attenuation in the Southern Indian Shield and its implications
title Spatial variation of coda wave attenuation in the Southern Indian Shield and its implications
spellingShingle Spatial variation of coda wave attenuation in the Southern Indian Shield and its implications
Singh, Chandrani
Coda Q
Attenuation characteristics
Indian peninsular shield
Heat flow
title_short Spatial variation of coda wave attenuation in the Southern Indian Shield and its implications
title_full Spatial variation of coda wave attenuation in the Southern Indian Shield and its implications
title_fullStr Spatial variation of coda wave attenuation in the Southern Indian Shield and its implications
title_full_unstemmed Spatial variation of coda wave attenuation in the Southern Indian Shield and its implications
title_sort Spatial variation of coda wave attenuation in the Southern Indian Shield and its implications
dc.creator.none.fl_str_mv Singh, Chandrani
Basha, S. K.
Shekar, M.
Chadha, R. K.
author Singh, Chandrani
author_facet Singh, Chandrani
Basha, S. K.
Shekar, M.
Chadha, R. K.
author_role author
author2 Basha, S. K.
Shekar, M.
Chadha, R. K.
author2_role author
author
author
dc.subject.none.fl_str_mv Coda Q
Attenuation characteristics
Indian peninsular shield
Heat flow
topic Coda Q
Attenuation characteristics
Indian peninsular shield
Heat flow
description During the recent past the Indian peninsular shield has experienced six damaging earthquakes of M 5.4-7.7 and compelled to readdress our understanding of the seismic attenuation characteristics for better evaluation of the seismic hazards in the so-called stable shield. We have performed the seismic attenuation study using coda waves of the broadband network from 1995 to 2009 for the shield region. About 400 local earthquakes M 2.5-4.0 within an epicentral distance of 250km are used in this study. The broadband seismic stations established are in different geological provinces, such as the Archaean Dharwar craton, the southern granulite terrain, the Proterozoic Cuddapah basin, the Godavari graben, the Cretaceous-Eocene Deccan volcanic province and in the Cambay basin. This allows us to understand the fluctuation of Q0 in terms of spatial variations in the geologic and tectonic provinces. The results reflect a ubiquitous observation of frequency dependence of Qc in the different geologic provinces. The rift basins exhibit lower Q0, which suggests higher attenuation due to a more heterogeneous structure. Higher Q0 in the western Dharwar craton infers lower attenuation. Similarly the Deccan volcanic province is characterized by significantly higher Q0. The results show a good correlation with the observed heat flow. The study fills an important gap in knowledge about the Q factor as well as of crustal attenuation conditions in the whole southern peninsular shield of India.
publishDate 2012
dc.date.none.fl_str_mv 2
2012-01-01
2012
2012-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/99656
https://dx.doi.org/urn:doi:10.1344/105.000001751
url https://ddd.uab.cat/record/99656
https://dx.doi.org/urn:doi:10.1344/105.000001751
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/3.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
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eu_rights_str_mv openAccess
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dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
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