Active tectonics of the Alhama de Murcia fault, Betic Cordillera, Spain

We present an overview of the knowledge of the structure and the seismic behavior of the Alhama de Murcia Fault (AMF). We utilize a fault traces map created from a LIDAR DEM combined with the geodynamic setting, the analysis of the morphology, the distribution of seismicity, the geological information from E 1:50000 geological maps and the available paleoseismic data to describe the recent activity of the AMF. We discuss the importance of uncertainties regarding the structure and kinematics of the AMF applied to the interpretation and spatial correlation of the paleoseismic data. In particular, we discuss the nature of the faults dipping to the SE (antithetic to the main faults of the AMF) in several segments that have been studied in the previous paleoseismic works. A special chapter is dedicated to the analysis of the tectonic source of the Lorca 2011 earthquake that took place in between two large segments of the fault.

[1]  H. Philip,et al.  Seismotectonics of the Lower Cheliff Basin: Structural background of the El Asnam (Algeria) Earthquake , 1986 .

[2]  C. Montenat,et al.  Le prolongement de l'accident d'Alhama de Murcia entre Murcia et Alicante (Espagne meridionale); resultats d'une etude geophysique , 1977 .

[3]  A. Negredo,et al.  Neotectonic modelling of the western part of the Africa^Eurasia plate boundary: from the Mid-Atlantic ridge to Algeria , 2003 .

[4]  D. Wells,et al.  New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement , 1994, Bulletin of the Seismological Society of America.

[5]  J. Balanya,et al.  Les directions structurales dans le Domaine d'Alborán de part et d'autre du Détroit de Gibraltar , 1987 .

[6]  Large Holocene morphogenic earthquakes along the Albox fault, Betic Cordillera, Spain , 2005 .

[7]  R. King,et al.  New GPS constraints on active deformation along the Africa-Iberia plate boundary , 2011 .

[8]  J. Nocquet,et al.  Evidence for a post-3.16-Ma change in Nubia Eurasia North America plate motions ? , 2003 .

[9]  J. J. Martínez-Díaz.  Stress field variation related to fault interaction in a reverse oblique-slip fault: the Alhama de Murcia fault, Betic Cordillera, Spain , 2002 .

[10]  A. Rachocki,et al.  Alluvial fans : a field approach , 1990 .

[11]  C. Montenat,et al.  Evolution structurale de la zone bétique orientale (Espagne) du Tortonien à l'Holocène , 1985 .

[12]  Julián García Mayordomo.  Caracterización y análisis de la peligrosidad sismica en el sureste de España , 2005 .

[13]  J. Bousquet,et al.  Observations microtectoniques sur la compression nord-sud quaternaire des Cordilleres betiques orientales (Espagne meridionale - Arc de Gibraltar) , 1976 .

[14]  An exceptionally long paleoseismic record of a slow-moving fault: The Alhama de Murcia fault (Eastern Betic shear zone, Spain) , 2012 .

[15]  S. Hall,et al.  Comparative microstructures of natural and experimentally produced clay-bearing fault gouges , 1986 .

[16]  P. S. Barroso,et al.  Características estructurales y geométricas de la falla de desgarre de Lorca-Alhama , 1992 .

[17]  J. Galindo‐Zaldívar,et al.  The Maláguide-Alpujárride contact (Betic Cordilleras, Spain) : a brittle extensional detachment , 1991 .

[18]  E. Gràcia,et al.  Characterizing the seismic potential of the Eastern Betics Shear Zone (EBSZ), a major source of earthquakes in Southeastern Iberia , 2010 .

[19]  J. Bousquet.  Quaternary Strike-Slip Faults in Southeastern Spain , 1979 .

[20]  J. Galindo‐Zaldívar,et al.  The Alpujárride-Nevado-Fibábride extensional shear zone, Betic Cordillera, SE Spain , 1993 .

[21]  A. Goudie,et al.  Geomorphology in Arid Regions , 1980 .

[22]  Paolo Baldi,et al.  Kinematics of the Western Africa-Eurasia plate boundary from focal mechanisms and GPS data , 2007 .

[23]  L. Somoza,et al.  Landscape response to strike-slip faulting linked to collisional settings: Quaternary tectonics and basin formation in the Eastern Betics, southeastern Spain , 1993 .

[24]  R. Vissers,et al.  The 11 May 2011 earthquake at Lorca (SE Spain) viewed in a structural-tectonic context , 2011 .

[25]  E. Suriñach,et al.  Crustal deformation in eastern Betics from CuaTeNeo GPS network , 2013 .

[26]  J. J. Martínez-Díaz,et al.  Using travertine deformations to characterize paleoseismic activity along an active oblique-slip fault: the Alhama de Murcia fault (Betic Cordillera, Spain) , 2001 .

[27]  J. J. Martínez-Díaz,et al.  The Alhama de Murcia fault (SE Spain), a seismogenic fault in a diffuse plate boundary: Seismotectonic implications for the Ibero‐Magrebian region , 2004 .

[28]  J. Azañón,et al.  Mode of extensional tectonics in the southeastern Betics (SE Spain): Implications for the tectonic evolution of the peri‐Alborán orogenic system , 1997 .

[29]  G. Bianco,et al.  Active deformation in the Mediterranean from Gibraltar to Anatolia inferred from numerical modeling and geodetic and seismological data , 2003 .

[30]  J. Morales,et al.  Tectonic and seismic implications of an intersegment rupture: The damaging May 11th 2011 Mw 5.2 Lorca, Spain, earthquake , 2012 .

[31]  J. Galindo‐Zaldívar,et al.  Progressive extensional shear structures in a detachment contact in the Western Sierra Nevada (Betic Cordilleras, Spain) , 1989 .

[32]  Richard G. Gordon,et al.  Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions , 1994 .

[33]  J. Morales,et al.  Moment tensor solutions for small and moderate earthquakes in the Ibero‐Maghreb region , 2003 .

[34]  V. García-Dueñas,et al.  Miocene extensional detachments in the outcropping basement of the northern Alboran Basin (Betics) and their tectonic implications , 1992 .

[35]  W. Bull,et al.  Tectonic Geomorphology North and South of the Garlock Fault, California , 1977 .

[36]  E. García-Meléndez,et al.  Neotectonics and Plio-Quaternary landscape development within the eastern Huercal-Overa Basin (Betic Cordilleras, southeast Spain) , 2003 .

[37]  T. Bardají,et al.  Paleoseismic indications along ‘aseismic’ fault segments in the guadalentín depression (SE Spain) , 1997 .

[38]  J. Morales,et al.  Rupture directivity of the 2011, Mw 5.2 Lorca earthquake (Spain) , 2012 .

[39]  B. Meijninger.  Late-orogenic extension and strike-slip deformation in the Neogene of southeastern Spain , 2006 .

[40]  H. Philip,et al.  Seismotectonics of the El Asnam earthquake , 1981, Nature.