300.000 años de historia paleosísmica en la terminación SO de la Falla de Alhama de Murcia (Sistema de falla FAM-Góñar, Béticas Orientales)
- M. Ortuño 1
- E. Masana 1
- J. Martínez-Díaz 2
- E. García-Meléndez 3
- P. Štěpančíková 4
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1
Universitat de Barcelona
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2
Universidad Complutense de Madrid
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- 3 Universidad. de León
- 4 Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic
ISSN: 1576-5172
Año de publicación: 2012
Título del ejemplar: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.
Número: 13
Páginas: 1523-1526
Tipo: Artículo
Otras publicaciones en: Geotemas (Madrid)
Resumen
The Alhama de Murcia fault (FAM, Oriental Betics) is a slow but seismogenic fault. A paleoseismological study along its southwestern termination revealed its deformation history since 300 ka, an exceptionally long record compared with traditional paleoseismic analyses. A number of facts have favoured this: 1) the deformation being spread among multiple faults, 2) post-IRSL dating of sediments up to 325 ka in age (Sobahti et al., 2011) and 3) a condensed sedimentation record that provided information about a long period of time in trenches shallower than 3 m. Identification, dating and correlation of evidence of seismic events was carried out in 6 trenches at the FAM-Goñar fault system and yielded a common paleoseismic history with a minimum of 6 paleoearthquakes and a maximum recurrence period of 29 ka. According to the length of the system (up to 40 km) and the oblique kinematics of the fault (left lateral and reverse) the fault can produce Mmax = 7 earthquakes.