Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern Spain

[EN] The Alhama de Murcia fault is a 85 km long oblique-slip fault, and is related to historical and instrumental seismic activity. A paleoseismic analysis of the Lorca-Totana sector of the fault containing MSK I=VIII historical earthquakes was made in order to identify and quantify its seismic pote...

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Autores: Hernández-Enrile, J. L., Martínez-Díaz, J. J., Santanach i Prat, P., Masana Closa, E.
Tipo de recurso: artículo
Fecha de publicación:2001
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/5318
Acceso en línea:http://hdl.handle.net/10261/5318
Access Level:acceso abierto
Palabra clave:Geomorphology
Trench analysis
Paleoseismicity
Alhama de Murcia fault
Paleosismicidad
Falla de Alhama de Murcia
Geomorfología
Análisis en trincheras
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oai_identifier_str oai:digital.csic.es:10261/5318
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern Spain
Evidencias de eventos cosísmicos recurrentes en el período prehistórico en la falla de Alhama de Murcia
title Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern Spain
spellingShingle Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern Spain
Hernández-Enrile, J. L.
Geomorphology
Trench analysis
Paleoseismicity
Alhama de Murcia fault
Paleosismicidad
Falla de Alhama de Murcia
Geomorfología
Análisis en trincheras
title_short Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern Spain
title_full Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern Spain
title_fullStr Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern Spain
title_full_unstemmed Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern Spain
title_sort Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern Spain
dc.creator.none.fl_str_mv Hernández-Enrile, J. L.
Martínez-Díaz, J. J.
Santanach i Prat, P.
Masana Closa, E.
author Hernández-Enrile, J. L.
author_facet Hernández-Enrile, J. L.
Martínez-Díaz, J. J.
Santanach i Prat, P.
Masana Closa, E.
author_role author
author2 Martínez-Díaz, J. J.
Santanach i Prat, P.
Masana Closa, E.
author2_role author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Geomorphology
Trench analysis
Paleoseismicity
Alhama de Murcia fault
Paleosismicidad
Falla de Alhama de Murcia
Geomorfología
Análisis en trincheras
topic Geomorphology
Trench analysis
Paleoseismicity
Alhama de Murcia fault
Paleosismicidad
Falla de Alhama de Murcia
Geomorfología
Análisis en trincheras
description [EN] The Alhama de Murcia fault is a 85 km long oblique-slip fault, and is related to historical and instrumental seismic activity. A paleoseismic analysis of the Lorca-Totana sector of the fault containing MSK I=VIII historical earthquakes was made in order to identify and quantify its seismic potential. We present 1) the results of the neotectonic, structural and geomorphological analyses and, 2) the results of trenching. In the study area, the Alhama de Murcia fault forms a depressed corridor between two strands, the northwestern fault with morphological and structural features of a reverse component of slip, bounding the La Tercia range to the South, and the southeastern fault strand with evidence of sinistral oblique strike-slip movement. The offset along this latter fault trapped the sediments in transit from the La Tercia range towards the Guadalentín depression. The most recent of these sediments are arranged in three generations of alluvial fans and terraces. The first two trenches were dug in the most recent sediments across the southeastern fault strand. The results indicate a coseismic reverse fault deformation that involved the sedimentary sequence up to the intermediate alluvial fan and the Holocene terrace deposits. The sedimentary evolution observed in the trenches suggests an event of temporary damming of the Colmenar creek drainage to the South due to uplifting of the hanging wall during coseismic activation of the fault. Trench, structural and sedimentological features provide evidence of at least three coseismic events, which occurred after 125,000 yr. The minimum vertical slip rate along the fault is 0.06 mm/yr and the average recurrence period should not exceed 40,000 yr in accordance with the results obtained by fan topographic profiling. Further absolute dating is ongoing to constrain these estimates.
publishDate 2001
dc.date.none.fl_str_mv 2001
2008
2008
dc.type.none.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/5318
url http://hdl.handle.net/10261/5318
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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application/pdf
dc.publisher.none.fl_str_mv CSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA)
publisher.none.fl_str_mv CSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA)
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
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spelling Evidence for coseismic events of recurrent prehistoric deformation along the Alhama de Murcia fault, southeastern SpainEvidencias de eventos cosísmicos recurrentes en el período prehistórico en la falla de Alhama de MurciaHernández-Enrile, J. L.Martínez-Díaz, J. J.Santanach i Prat, P.Masana Closa, E.GeomorphologyTrench analysisPaleoseismicityAlhama de Murcia faultPaleosismicidadFalla de Alhama de MurciaGeomorfologíaAnálisis en trincheras[EN] The Alhama de Murcia fault is a 85 km long oblique-slip fault, and is related to historical and instrumental seismic activity. A paleoseismic analysis of the Lorca-Totana sector of the fault containing MSK I=VIII historical earthquakes was made in order to identify and quantify its seismic potential. We present 1) the results of the neotectonic, structural and geomorphological analyses and, 2) the results of trenching. In the study area, the Alhama de Murcia fault forms a depressed corridor between two strands, the northwestern fault with morphological and structural features of a reverse component of slip, bounding the La Tercia range to the South, and the southeastern fault strand with evidence of sinistral oblique strike-slip movement. The offset along this latter fault trapped the sediments in transit from the La Tercia range towards the Guadalentín depression. The most recent of these sediments are arranged in three generations of alluvial fans and terraces. The first two trenches were dug in the most recent sediments across the southeastern fault strand. The results indicate a coseismic reverse fault deformation that involved the sedimentary sequence up to the intermediate alluvial fan and the Holocene terrace deposits. The sedimentary evolution observed in the trenches suggests an event of temporary damming of the Colmenar creek drainage to the South due to uplifting of the hanging wall during coseismic activation of the fault. Trench, structural and sedimentological features provide evidence of at least three coseismic events, which occurred after 125,000 yr. The minimum vertical slip rate along the fault is 0.06 mm/yr and the average recurrence period should not exceed 40,000 yr in accordance with the results obtained by fan topographic profiling. Further absolute dating is ongoing to constrain these estimates.[ES] Se presentan los primeros resultados del estudio paleosísmico del sector Lorca-Totana (con terremotos históricos de I=VIII) de la falla de Alhama de Murcia, de deslizamiento direccional oblícuo sinestroso, para caracterizar su potencial sísmico. Esto incluye: 1) resultados del estudio neotectónico, estructural y geomorfológico y 2) primeros resultados obtenidos en trincheras. El área estudiada muestra dos zonas de falla, la noroeste, que limita la sierra de la Tercia, con morfología y estructuras típicas de movimiento inverso, y la sureste con evidencias de deslizamiento direccional sinestroso, separadas por un corredor deprimido. La actividad de estas fallas ha atrapado en el corredor gran cantidad de sedimentos en su transporte hacia la depresión del Guadalentín, los más recientes de los cuales se o rganizan en tres generaciones de abanicos aluviales y terrazas. Las dos trincheras se ex c avaron en los sedimentos de la generación int e rmedia de abanicos aluviales y en la de terrazas más recientes deformados por la falla sureste. Los primeros resultados indican deformación cosísmica con deslizamiento inverso. Se interpreta también un bloqueo temporal del drenaje hacia el sur de la rambla de El Colmenar debido al levantamiento del bloque superior de la falla en un proceso cosísmico. Se describen evidencias de hasta tres paleoterremotos que, en un primer análisis sin datos de edad absoluta, habrían tenido lugar posteriormente a 125.000 años. La velocidad de deslizamiento no sería inferior a 0,06 mm/a y el período de recurrencia no sería mayor a 40.000 años. Estos primeros datos se podrán ajustar mediante dataciones absolutas que están en curso.This study was supported by the FAUST project (ENV4- CT97-0528) and the project AMB97-0523: "Active tectonic analysis of the Murcia region and their application to seismic hazard assessment" (C.I.C.Y.T.). We are indebted to Daniela Pantosti and Hervé Philip for critically rev i ewing this paper. We also thank Mabel Gómez, Raquel Amores, Angel Martínez, Juan Arregui, and Juanmi Insua for their invaluable help. Thanks are also due to Mrs. Mª. Victoria Tejón for permission to trench on her property.Peer reviewedCSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]200820082001info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501453043 bytesapplication/pdfhttp://hdl.handle.net/10261/5318reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/53182026-05-22T06:33:51Z
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