The 1909 Benavente (Portugal) earthquake : search for the source
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.9/2321 |
Resumo: | The Lower Tagus River Valley has been affected by severe earthquakes comprising distant events, as in 1755, and local earthquakes, as in 1344, 1531, and 1909. The 1909 earthquake was located NE of Lisbon, near Benavente, causing serious damage and many losses. Mw 6.0 has been assessed for this earthquake and a reverse faulting focal mechanism solution has been calculated. Poor epicenter location, possible directivity and site effects, low fault slip rates, and the thick Cenozoic sedimentary cover make difficult correlation with regional structures. The focal mechanism indicates an ENE reverse fault as source, though it does not match any outcropping active structure suggesting that the event could have been produced by a blind thrust beneath the Cenozoic sedimentary fill. Hidden sources, inferred from seismic reflection data, are a possible NE structure linking the Vila Franca de Xira and the Azambuja faults, or the southern extension of the later. Evidence of surface rupturing is inhibited by the thick Holocene alluvial cover and the high fluvial sedimentation rate, though a slightly depressed area was identified in the Tagus alluvial plain W of Benavente which was investigated as possible geomorphic evidence of co-seismic surface deformation. A high-resolution seismic reflection profile was acquired across a 0.5 m high scarp at this site, and two trenches were opened across the scarp for paleoseismic research. Some deformation of dubious tectonic origin was found, requiring further studies. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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The 1909 Benavente (Portugal) earthquake : search for the sourceSismotectónicaSismo de grande intensidadeSismo de 1909 (Vale do Rio Tejo, Portugal)Vale do Rio Tejo (Portugal)The Lower Tagus River Valley has been affected by severe earthquakes comprising distant events, as in 1755, and local earthquakes, as in 1344, 1531, and 1909. The 1909 earthquake was located NE of Lisbon, near Benavente, causing serious damage and many losses. Mw 6.0 has been assessed for this earthquake and a reverse faulting focal mechanism solution has been calculated. Poor epicenter location, possible directivity and site effects, low fault slip rates, and the thick Cenozoic sedimentary cover make difficult correlation with regional structures. The focal mechanism indicates an ENE reverse fault as source, though it does not match any outcropping active structure suggesting that the event could have been produced by a blind thrust beneath the Cenozoic sedimentary fill. Hidden sources, inferred from seismic reflection data, are a possible NE structure linking the Vila Franca de Xira and the Azambuja faults, or the southern extension of the later. Evidence of surface rupturing is inhibited by the thick Holocene alluvial cover and the high fluvial sedimentation rate, though a slightly depressed area was identified in the Tagus alluvial plain W of Benavente which was investigated as possible geomorphic evidence of co-seismic surface deformation. A high-resolution seismic reflection profile was acquired across a 0.5 m high scarp at this site, and two trenches were opened across the scarp for paleoseismic research. Some deformation of dubious tectonic origin was found, requiring further studies.Repositório do LNEGCabral, JoãoMoniz, CatarinaBatlló, JosepFigueiredo, P.Carvalho, JoãoMatias, L.Costa, Paula TevesDias, Ruben PereiraSimão, N.2014-03-17T10:49:19Z2013-112013-11-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/2321engCabral, J... [et al.] - The 1909 Benavente (Portugal) earthquake : search for the source. In: Natural Hazards, Vol. 69, Issue 2 (November 2013), p. 1211-1227info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-12-04T04:45:02Zoai:repositorio.lneg.pt:10400.9/2321Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:35:12.892302Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
The 1909 Benavente (Portugal) earthquake : search for the source |
title |
The 1909 Benavente (Portugal) earthquake : search for the source |
spellingShingle |
The 1909 Benavente (Portugal) earthquake : search for the source Cabral, João Sismotectónica Sismo de grande intensidade Sismo de 1909 (Vale do Rio Tejo, Portugal) Vale do Rio Tejo (Portugal) |
title_short |
The 1909 Benavente (Portugal) earthquake : search for the source |
title_full |
The 1909 Benavente (Portugal) earthquake : search for the source |
title_fullStr |
The 1909 Benavente (Portugal) earthquake : search for the source |
title_full_unstemmed |
The 1909 Benavente (Portugal) earthquake : search for the source |
title_sort |
The 1909 Benavente (Portugal) earthquake : search for the source |
author |
Cabral, João |
author_facet |
Cabral, João Moniz, Catarina Batlló, Josep Figueiredo, P. Carvalho, João Matias, L. Costa, Paula Teves Dias, Ruben Pereira Simão, N. |
author_role |
author |
author2 |
Moniz, Catarina Batlló, Josep Figueiredo, P. Carvalho, João Matias, L. Costa, Paula Teves Dias, Ruben Pereira Simão, N. |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
Repositório do LNEG |
dc.contributor.author.fl_str_mv |
Cabral, João Moniz, Catarina Batlló, Josep Figueiredo, P. Carvalho, João Matias, L. Costa, Paula Teves Dias, Ruben Pereira Simão, N. |
dc.subject.por.fl_str_mv |
Sismotectónica Sismo de grande intensidade Sismo de 1909 (Vale do Rio Tejo, Portugal) Vale do Rio Tejo (Portugal) |
topic |
Sismotectónica Sismo de grande intensidade Sismo de 1909 (Vale do Rio Tejo, Portugal) Vale do Rio Tejo (Portugal) |
description |
The Lower Tagus River Valley has been affected by severe earthquakes comprising distant events, as in 1755, and local earthquakes, as in 1344, 1531, and 1909. The 1909 earthquake was located NE of Lisbon, near Benavente, causing serious damage and many losses. Mw 6.0 has been assessed for this earthquake and a reverse faulting focal mechanism solution has been calculated. Poor epicenter location, possible directivity and site effects, low fault slip rates, and the thick Cenozoic sedimentary cover make difficult correlation with regional structures. The focal mechanism indicates an ENE reverse fault as source, though it does not match any outcropping active structure suggesting that the event could have been produced by a blind thrust beneath the Cenozoic sedimentary fill. Hidden sources, inferred from seismic reflection data, are a possible NE structure linking the Vila Franca de Xira and the Azambuja faults, or the southern extension of the later. Evidence of surface rupturing is inhibited by the thick Holocene alluvial cover and the high fluvial sedimentation rate, though a slightly depressed area was identified in the Tagus alluvial plain W of Benavente which was investigated as possible geomorphic evidence of co-seismic surface deformation. A high-resolution seismic reflection profile was acquired across a 0.5 m high scarp at this site, and two trenches were opened across the scarp for paleoseismic research. Some deformation of dubious tectonic origin was found, requiring further studies. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-11 2013-11-01T00:00:00Z 2014-03-17T10:49:19Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.9/2321 |
url |
http://hdl.handle.net/10400.9/2321 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Cabral, J... [et al.] - The 1909 Benavente (Portugal) earthquake : search for the source. In: Natural Hazards, Vol. 69, Issue 2 (November 2013), p. 1211-1227 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799130217765142528 |