RT Journal Article
T1 New insights on the seismogenic potential of the EasternBetic Shear Zone (SE Iberia): Quaternary activity and paleoseismicity of the SW segment of the Carrascoy Fault Zone
A1 Martín Banda, Raquel
A1 García Mayordomo, Julián
A1 Insúa Arévalo, Juan Miguel
A1 Salazar, Ángel E.
A1 Rodríguez-Escudero, Emilio
A1 Álvarez-Gómez, Jose A.
A1 Medialdea, Alicia
A1 Herrero, María J.
AB The Carrascoy Fault (CAF) is one of the main active faults that form part of the Eastern Betic Shear Zone, a 450 km fault system that accommodates most of the convergence between the Eurasian (Iberia) and Nubian plates in the Betic Cordillera, south Spain. Although the CAF represents a major earthquake threat to the nearby City of Murcia, studies on its Quaternary tectonics and seismogenic potential are scarce to date. We present evidence that supports the division of the CAF into two overlapping segments with contrasting tectonic structure, Quaternary activity, and landform control: a SW segment, characterized by a broad fold-and-thrust zone similar to the forebergs defined in the Gobi-Altai region, and a NE segment, characterized by a sharp mountain front controlled by strike-slip tectonics. We attribute the differentiation into these two segments to the stresses associated with topography, which in turn is a consequence of the shortening component, at the middle Pleistocene, after circa 217.4 ka. For the SW segment we infer the occurrence of 9 to 11, Mw 6.7 paleoearthquakes in the last 30.2 kyr, and a slip rate of 0.37 ± 0.08 m/kyr. We date the occurrence of the last surface rupture event after 2750 B.P., and we estimate an average recurrence period of major events of 3.3 ± 0.7 kyr.
PB American Geophysical Union
SN ISSN: 0278-7407 ; ESSN: 1944-9194
YR 2016
FD 2016-01
LK https://hdl.handle.net/20.500.14352/23537
UL https://hdl.handle.net/20.500.14352/23537
LA eng
NO Ministerio de Economía y Competitividad (MINECO)
NO Instituto Geológico y Minero de España
DS Docta Complutense
RD 16 may 2024