Fallas recientes y activas asociadas al desarrollo del sector suroccidental de la Cuenca de Granada y su peligrosidad geológica.
Fecha
2024-05-13
Autores
Vinardell Peña, Raquel
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Editor
Jaén: Universidad de Jaén
Resumen
La Falla de Zafarraya produjo en 1884 el mayor terremoto catastrófico que ha sufrido Andalucía. Las observaciones de campo indican que es una falla normal. Desde 2004 se monitorea mediante una red geodésica GNSS. Sorprendentemente, la red geodésica indica un acortamiento de la región opuesto a la extensión asociada a la falla normal. Para mejorar el conocimiento de la falla se ha realizado una campaña geofísica en la que se adquirieron datos de resistividad del subsuelo mediante tomografía eléctrica para la caracterización de la falla y mejorar la correlación con la información geodésica que permiten entender mejor la evolución estructural y tectónica de la región. La Falla de Zafarraya se interpreta como una falla normal formada por colapso de una antiforma que se desarrolla como resultado de los esfuerzos de compresión que afectan el área de estudio.
The Zafarraya Fault produced in 1884 the largest catastrophic earthquake that Andalusia has suffered. Field observations indicate that it is a normal failure. Since 2004 it has been monitored by means of a GNSS geodetic network. Surprisingly, the geodetic network indicates a shortening of the region opposite to the extension associated with the normal fault. In order to improve the knowledge of the fault, a geophysical campaign was carried out in which subsoil resistivity data was acquired by electrical tomography for the characterization of the fault and to improve the correlation with the geodesic information that allow a better understanding of the structural and tectonic evolution of the region. The Zafarraya Fault is interpreted as a normal fault formed by the collapse of an antiform that develops as a result of compression stresses that affect the study area.
The Zafarraya Fault produced in 1884 the largest catastrophic earthquake that Andalusia has suffered. Field observations indicate that it is a normal failure. Since 2004 it has been monitored by means of a GNSS geodetic network. Surprisingly, the geodetic network indicates a shortening of the region opposite to the extension associated with the normal fault. In order to improve the knowledge of the fault, a geophysical campaign was carried out in which subsoil resistivity data was acquired by electrical tomography for the characterization of the fault and to improve the correlation with the geodesic information that allow a better understanding of the structural and tectonic evolution of the region. The Zafarraya Fault is interpreted as a normal fault formed by the collapse of an antiform that develops as a result of compression stresses that affect the study area.