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Geological evidences of surface rupture related to a seventeenth century destructive earthquake in Betic Cordillera (SE Spain): constraining the seismic hazard of the Alhama de Murcia fault

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Martínez Díaz, José J. and Alonso Henar, Jorge and Insúa Arévalo, Juan Miguel and Canora Catalán, Carolina and García Mayordomo, Julián and Rodríguez Escudero, Emilio and Álvarez Gómez, José Antonio and Ferrater, Marta and Ortuño, María and Masana, Eulàlia (2019) Geological evidences of surface rupture related to a seventeenth century destructive earthquake in Betic Cordillera (SE Spain): constraining the seismic hazard of the Alhama de Murcia fault. Journal of Iberian Geology, 45 (1). pp. 73-86. ISSN 1698-6180

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Official URL: https://link.springer.com/article/10.1007/s41513-018-0082-2



Abstract

Constraining the date of the last major event occurred in a fault is of paramount importance in probabilistic seismic hazard assessment when time-dependent models are considered. Eight of the twelve destructive earthquakes occurred in the eastern Betic Cordillera since sixteenth century, are located less than 10 km away from the Alhama de Murcia fault (AMF). Up to now, it has not been identified any geological evidence on the ground surface to associate these events with the activity of specific fault sections of the AMF. In this work we present the first geological evidence of the catastrophic 1674 event occurred at Lorca (SE Spain). The excavations carried out at La Torrecilla Creek exposed archaeological remains from the Islamic period (VIII–XIII centuries in this region) affected by 55 ± 20 cm offset by the AMF fault. This event reached intensity VIII and produced 30 fatalities at Lorca for an estimated population of 7300 inhabitants. This supports the occurrence of earthquakes with surface rupture in the historical epoch on the Alhama de Murcia fault and reinforces the results obtained in previous paleoseismological work. The theoretical scenarios of maximum magnitudes and recurrence time obtained by combining this historical event with the fault slip rate allow us to conclude that the seismic hazard associated with maximum magnitude events in this section could be high. In addition, the static Coulomb stress transferred to the Góñar–Lorca section by the 2011 (Mw 5.2) Lorca earthquake may have significantly increased the hazard.


Item Type:Article
Uncontrolled Keywords:Surface rupture, Active fault, Seismic hazard, Betic Cordillera, Alhama de Murcia fault
Subjects:Sciences > Geology > Geodynamics
Sciences > Geology > Seismology
ID Code:54938
Deposited On:05 Apr 2019 17:59
Last Modified:08 Apr 2019 07:34

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