Publication: Caracterización sísmica de la falla de Alhama de Murcia
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Publication Date
2016
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Sociedad Geológica de España.
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Abstract
La falla de Alhama de Murcia (AMF) es una de las fallas más activas de la Península Ibérica y fue la causante del terremoto de Lorca de 2011 que significó numerosos daños materiales e incluso víctimas mortales. Esta falla oblicua en dirección NE-SO, que se extiende por más de 100 km, ha sido estudiada en superficie pero poco se sabe de su estructura en profundidad. Esto es especialmente importante para poder interpretar de forma correcta los numerosos datos paleosísmicos que se están obteniendo, ya que conocer la relación estructural en profundidad de las distintas ramas que forman la AMF es esencial. Por este motivo, y dentro del marco del proyecto InterGEO, se ha realizado una campaña de adquisición de datos sísmicos 2D a lo largo de la AMF, centrándose en los segmentos más interesantes en la zona de Lorca-Totana. Aquí se presentan los los resultados preliminares del procesado de algunos de los perfiles adquiridos en esta campaña que muestran la primera imagen estructural de la falla en profundidad y que permitirá entender el comportamiento de dicha falla, así como determinar su relevancia desde el punto de vista del riesgo sísmico.
The Alhama de Murcia fault (AMF) is one of the most active faults of the Iberian Peninsula and the source of the Lorca 2011 earthquake that caused significant damage including several casualties. This NE-SW oblique fault, extended more than 100 km, has been extensively mapped to characterize its surface structure but almost no information is available of the structure and geometry at depth. This is specially significant in order to correctly interpret the obtained paleoseismic data considering that the knowledge of the structural relationship in depth between different branches of the fault is necessary. Accordingly, and within the InterGEO project, a 2D seismic reflection acquisition experiment was carried out along the AMF, focusing in the more interesting segments in the Lorca-Totana area. In this work we present the very first results of the acquired seismic reflection profiles that show the first structural image in depth of this fault which allow us to understand the seismic behaviour of the fault, and determine its relevance in seismic hazard.
The Alhama de Murcia fault (AMF) is one of the most active faults of the Iberian Peninsula and the source of the Lorca 2011 earthquake that caused significant damage including several casualties. This NE-SW oblique fault, extended more than 100 km, has been extensively mapped to characterize its surface structure but almost no information is available of the structure and geometry at depth. This is specially significant in order to correctly interpret the obtained paleoseismic data considering that the knowledge of the structural relationship in depth between different branches of the fault is necessary. Accordingly, and within the InterGEO project, a 2D seismic reflection acquisition experiment was carried out along the AMF, focusing in the more interesting segments in the Lorca-Totana area. In this work we present the very first results of the acquired seismic reflection profiles that show the first structural image in depth of this fault which allow us to understand the seismic behaviour of the fault, and determine its relevance in seismic hazard.