Exploración Geofísica en el Sistema de Fallas Alhama-Murcia (FAM). Parte I: Transecto La Torrecilla.

Abstract

The Alhama-Murcia system fault (AMF) is placed in Betic mountain range to the south of the Iberian Peninsula. This NE-SW oblique fault, extended up to 100 km, has been extensively mapped to characterize its surface structure but almost no information is available of the structure and geometry at depth. The destructive earthquake of Lorca (Mw 5.2) occurred on 2011 is associated with this fault.Within the InterGEO research project with the aim to be the seed for the development of a future Near Fault Observatories (NFO), 2D geophysical models were carried out cutting the AMF at several segments. In this communication we present the seismic models (refraction, reflection and MASW) and the 2D electrical resistivity profile (ERT) obtained in the Torrecilla transect, three km SW of Lorca where the fault zone shearing is more concentrated. The results of these 2D models are correlated with the results of the scientific borehole FAM-1 a 175 m depth drilled close to La Torrecilla rambla.