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Descripción
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| The El Salvador Fault Zone (ESFZ) is a right lateral strike-slip fault zone, c. 150 km long and 20 km wide within the Salvadorian volcanic arc in Central America. This shear band distributes the deformation between main strike-slip faults trending N90º-100ºE and around 30 km long, and secondary normal faults trending between N120ºE and N170ºE. The ESFZ continues westward and is relieved by the Jalpatagua Fault and becomes less clear eastward disappearing at Golfo de Fonseca. Five segments have been proposed for the whole fault zone. These segments are (from west to east): Western segment, San Vicente Segment, Lempa Segment, Berlin Segment and San Miguel Segment. Paleoseismic studies carried out in the Berlin and San Vicente Segments reveal an important amount of quaternary deformation and paleoearthquakes up to Mw 7.6. In this study we present 45 capable seismic sources in El Salvador and their reliminary slip-rate from geological and GPS data. We also present the results of four observation campaigns of the ZFESNet from 2007 to 2012. We have included five CGPS stations, three from IGS (Dow et al., 2009) and two from CORS (Snay and Soler, 2008). From final velocities obtained in each campaign we have estimated velocities and uncertainties for each station referred to ITRF2008. The calculated preliminary slip-rates range from 0.5 to 8 mm/yr for individualized faults within the ESFZ. We calculated maximum magnitudes from the mapped lengths and paleoseismic trenches and we propose different earthquakes scenario combining possibles ruptures that imply individualized faults within the ESFZ, resulting in maximum magnitudes of Mw 7.6. We used deterministic models to calculate acceleration distribution related with maximum earthquakes of the different proposed scenario. Isoseismal maps of some scenario are compared and calibrated using the February 13, 2001 earthquake, as control earthquake. To explore the sources of historical earthquakes we compare synthetic isoseismal maps with the historical earthquakes of March 6, 1719 and June 8, 1917. | |
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Internacional
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Si |
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Nombre congreso
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EGU General Assembly 2014 |
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Tipo de participación
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960 |
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Lugar del congreso
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Viena, Austria |
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Revisores
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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27/04/2014 |
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Fecha fin congreso
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02/05/2014 |
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Desde la página
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5233 |
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Hasta la página
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5233 |
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Título de las actas
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Geophysical Research Abstracts |