Time and Space Variation of Strong Motions Parameters for Subduction Interface Earthquakes

The strong ground motions generated by earthquakes can be related to the characteristics of the earthquakes source (stress drop, rupture velocity etc..), and therefore to the frictional conditions of the faults. These characteristics are usually studied by analyzing the low frequency band (≤ 1Hz) of...

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Autor: Piña-Valdés, Jesus Vladimir Antonio
Tipo de recurso: tesis doctoral
Estado:Versión publicada
Fecha de publicación:2017
País:Chile
OAI Identifier:oai:repositorio.anid.cl:10533/241928
Acceso en línea:https://hdl.handle.net/10533/241928
Access Level:acceso abierto
Palabra clave:Ingeniería y Tecnología
Ciencias de la Tierra y del Medio Ambiente
Ingeniería Ambiental y Geológica
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dc.title.es_CL.fl_str_mv Time and Space Variation of Strong Motions Parameters for Subduction Interface Earthquakes
title Time and Space Variation of Strong Motions Parameters for Subduction Interface Earthquakes
spellingShingle Time and Space Variation of Strong Motions Parameters for Subduction Interface Earthquakes
Piña-Valdés, Jesus Vladimir Antonio
Ingeniería y Tecnología
Ciencias de la Tierra y del Medio Ambiente
Ingeniería Ambiental y Geológica
title_short Time and Space Variation of Strong Motions Parameters for Subduction Interface Earthquakes
title_full Time and Space Variation of Strong Motions Parameters for Subduction Interface Earthquakes
title_fullStr Time and Space Variation of Strong Motions Parameters for Subduction Interface Earthquakes
title_full_unstemmed Time and Space Variation of Strong Motions Parameters for Subduction Interface Earthquakes
title_sort Time and Space Variation of Strong Motions Parameters for Subduction Interface Earthquakes
dc.creator.none.fl_str_mv Piña-Valdés, Jesus Vladimir Antonio
author Piña-Valdés, Jesus Vladimir Antonio
author_facet Piña-Valdés, Jesus Vladimir Antonio
author_role author
dc.contributor.advisor.none.fl_str_mv Cotton, Fabrice
Socquet, Anne
dc.subject.oecd1n.es_CL.fl_str_mv Ingeniería y Tecnología
topic Ingeniería y Tecnología
Ciencias de la Tierra y del Medio Ambiente
Ingeniería Ambiental y Geológica
dc.subject.oecd2n.es_CL.fl_str_mv Ciencias de la Tierra y del Medio Ambiente
dc.subject.oecd3n.es_CL.fl_str_mv Ingeniería Ambiental y Geológica
description The strong ground motions generated by earthquakes can be related to the characteristics of the earthquakes source (stress drop, rupture velocity etc..), and therefore to the frictional conditions of the faults. These characteristics are usually studied by analyzing the low frequency band (≤ 1Hz) of the strong motion records of large earthquakes. The improvement of strong motion networks has generated large datasets of records of moderate and low magnitude earthquakes (Mw ≤ 6.0). These records contain information in the high frequency band (1 Hz – 50 Hz), which cannot be exploited using classical seismological methods. In order exploit the strong motion records of low magnitude earthquakes to study the subduction interface’s frictional conditions, we explore two methods for comparing the earthquakes frequency content: the first one based on spectral ratios, and the second one based on Ground Motion Prediction Equations (GMPEs). These methods have been used to investigate the spatial and temporal variability of the frequency content of subduction interface earthquakes in North Chile and Japan. Their respective benefits and limitations have been analyzed. These methodological comparisons allowed us to cross compare and validate the results, and to propose a new, reliable methodology based on the analysis of GMPEs residuals to compare the earthquakes frequency content. The analysis of the results showed a depth dependency of the frequency content of subduction earthquakes in agreement with the one derived from large megathrust ruptures [Lay et al., 2012]. Additionally, variations of the earthquake frequency content along trench have been detected, which may drive to a lateral segmentation of the subduction interface. This segmentation has been compared to the spatial distribution of the seismicity, the geometry of the subduction interface and its slippage conditions. Finally, before the occurrence of 2014 Iquique Earthquake Mw 8.1 in North Chile, a temporal evolution of the frequency content of the foreshocks has been detected, associated to a precursory slow slip of the subduction interface.
publishDate 2017
dc.date.issued.es_CL.fl_str_mv 2017
dc.date.accessioned.none.fl_str_mv 2020-04-24T16:59:02Z
2022-08-19T21:29:54Z
dc.date.available.none.fl_str_mv 2020-04-24T16:59:02Z
2022-08-19T21:29:54Z
dc.type.none.fl_str_mv Tesis Doctorado
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spelling Piña-Valdés, Jesus Vladimir Antonio2017https://hdl.handle.net/10533/241928http://purl.org/coar/access_right/c_abf2Ingeniería Ambiental y GeológicaCiencias de la Tierra y del Medio AmbienteIngeniería y TecnologíaTime and Space Variation of Strong Motions Parameters for Subduction Interface EarthquakesCotton, FabriceSocquet, AnneFranciaPiña-Valdés, Jesus Vladimir Antonio2020-04-24T16:59:02Z2022-08-19T21:29:54Z2020-04-24T16:59:02Z2022-08-19T21:29:54Z2017The strong ground motions generated by earthquakes can be related to the characteristics of the earthquakes source (stress drop, rupture velocity etc..), and therefore to the frictional conditions of the faults. These characteristics are usually studied by analyzing the low frequency band (≤ 1Hz) of the strong motion records of large earthquakes. The improvement of strong motion networks has generated large datasets of records of moderate and low magnitude earthquakes (Mw ≤ 6.0). These records contain information in the high frequency band (1 Hz – 50 Hz), which cannot be exploited using classical seismological methods. In order exploit the strong motion records of low magnitude earthquakes to study the subduction interface’s frictional conditions, we explore two methods for comparing the earthquakes frequency content: the first one based on spectral ratios, and the second one based on Ground Motion Prediction Equations (GMPEs). These methods have been used to investigate the spatial and temporal variability of the frequency content of subduction interface earthquakes in North Chile and Japan. Their respective benefits and limitations have been analyzed. These methodological comparisons allowed us to cross compare and validate the results, and to propose a new, reliable methodology based on the analysis of GMPEs residuals to compare the earthquakes frequency content. The analysis of the results showed a depth dependency of the frequency content of subduction earthquakes in agreement with the one derived from large megathrust ruptures [Lay et al., 2012]. Additionally, variations of the earthquake frequency content along trench have been detected, which may drive to a lateral segmentation of the subduction interface. This segmentation has been compared to the spatial distribution of the seismicity, the geometry of the subduction interface and its slippage conditions. 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