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Title: An exceptionally long paleoseismic record of a slow-moving fault: the Alhama de Murcia fault (Eastern Betic Shear Zone, Spain)
Author: Ortuño Candela, María
Masana, Eulàlia
García Meléndez, E.
Martínez-Díaz, José J.
Těpančíková, P.
Cunha, P. P.
Sohbati, R.
Canora, C.
Buylaert, J. P.
Murria, A. S.
Keywords: Paleosismologia
Serralades Bètiques
Benéticos Range (Spain)
Issue Date: 2012
Publisher: Geological Society of America
Abstract: Most catastrophic earthquakes occur along fast-moving faults, although some of them are triggered by slow-moving ones. Long paleoseismic histories are infrequent in the latter faults. Here, an exceptionally long paleoseismic record (more than 300 k.y.) of a slow-moving structure is presented for the southern tip of the Alhama de Murcia fault (Eastern Betic shear zone), which is characterized by morphological expression of current tectonic activity and by a lack of historical seismicity. At its tip, the fault divides into a splay with two main faults bounding the Góñar fault system. At this area, the condensed sedimentation and the distribution of the deformation in several structures provided us with more opportunities to obtain a complete paleoseismic record than at other segments of the fault. The tectonic deformation of the system was studied by an integrated structural, geomorphological, and paleoseismological approach. Stratigraphic and tectonic features at six paleoseismic trenches indicate that old alluvial units have been repeatedly folded and thrusted over younger ones along the different traces of the structure. The correlation of the event timing inferred for each of these trenches and the application of an improved protocol for the infrared stimulated luminescence (IRSL) dating of K-feldspar allowed us to constrain a paleoseismic record as old as 325 ka. We identifi ed a minimum of six possible paleoearthquakes of Mw = 6-7 and a maximum mean recurrence interval of 29 k.y. This provides compelling evidence for the underestimation of the seismic hazard in the region.
Note: Versió postprint del document publicat a:
It is part of: Geological Society of America Bulletin, 2012, vol. 124, num. 9-10, p. 1474-1494
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ISSN: 0016-7606
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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