Sismotectónica de la falla de Alhama de Murcia, implicaciones sismogenéticas del terremoto de Lorca de junio-1977 (Mb: 4,2)
DOI:
https://doi.org/10.3989/egeol.99555-6165Keywords:
Betic Cordillera, Alhama de Murcia Fault, Lorca Fault, seismotectonics, seismic risk, secondary faulting, neotectonics, active faut, reverse faultAbstract
A seismotectonic study of the oblique slip (strike-slip-reverse) Alhama de Murcia Fault (FAM) is presented. The spatial and temporal distribution of historical and instrumental seismicity around the fault is analyzed. The Lorca (1977, Mb 4.2) seismic sequence is interpreted in order to explain the extensional focal mechanism of the mainshock, under a compressional stress field. A model in which local extension occurs in the hanging wall, due to reverse movement of Alhama de Murcia Fault, is proposed to explain the earthquake. The hanging wall suffers a lateral extension due to free lateral space increase and/or flexion The dynamic link of FAM activity with small normal faults, located inside the hanging wall, may produce earthquakes with Mb ≻ 4.0. In that way, seismic risk assessment studies must to be into account the dynamic relations of second order active faults with the major faults, that are the true kinematic engine triggering activity on them.
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