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Título: | 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 |
Autor: | Martínez-Díaz, J. J. CSIC ORCID ; Alonso-Henar, J.; Insúa Arévalo, Juan Miguel; Canora Catalán, Carolina; García Mayordomo, Julián; Rodríguez-Escudero, Emilio; Álvarez Gómez, José Antonio; Ferrater, M.; Ortuño, María; Masana, E. | Palabras clave: | Surface rupture Active fault Seismic hazard Betic Cordillera Alhama de Murcia fault |
Fecha de publicación: | 2019 | Editor: | Springer Nature | Citación: | Journal of Iberian Geology 45(1): 73–86 (2019) | Resumen: | 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. | Versión del editor: | https://doi.org/10.1007/s41513-018-0082-2 | URI: | http://hdl.handle.net/10261/187736 | DOI: | 10.1007/s41513-018-0082-2 | ISSN: | 1698-6180 | E-ISSN: | 1886-7995 |
Aparece en las colecciones: | (IGEO) Artículos |
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