Shallow seismicity and active faults in the Betic Cordillera. A preliminary approach to seismic sources associated with specific faults

Galdeano, Carlos Sanz de; Casado, Carlos López; Delgado, José; Peinado, Mercedes

doi:10.1016/0040-1951(94)00279-i

Cited by 55 publications

(22 citation statements)

References 11 publications

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“…These folds extend along the continental shelf of the Alboran Sea deforming up to Holocene sediments . Kilometer-size folds interact with subordinated NW-SE to WNW-ESE normal faults of variable scale that frequently deform the Quaternary sediments with associated seismicity (Sanz de Galdeano et al, 1995;Galindo Zaldívar et al, 2009;Marín-Lechado et al, 2006;Alfaro et al, 2007).…”

Section: Betic Cordilleramentioning

confidence: 99%

Is there an active subduction beneath the Gibraltar orogenic arc? Constraints from Pliocene to present-day stress field

Pedrera

Ruíz-Constán

Galindo-Zaldı́var

et al. 2011

Journal of Geodynamics

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Section: Betic Cordilleramentioning

confidence: 99%

Is there an active subduction beneath the Gibraltar orogenic arc? Constraints from Pliocene to present-day stress field

Pedrera

Ruíz-Constán

Galindo-Zaldı́var

et al. 2011

Journal of Geodynamics

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“…Seismotectonic studies in the Gibraltar Arc indicate fault regimes that vary from normal to thrust faulting, with large strike‐slip faults affecting sectors of the Betics and Rif [e.g., Galindo‐Zaldívar et al , 1993; Buforn et al , 1995; López Casado et al , 2001; Stich et al , 2003]. These structures are thought to control most of the deformation in the southeastern Betics and East Alboran Basin during the Neogene [e.g., Andreux et al , 1971; Bousquet , 1979; Leblanc and Olivier , 1984; Weijermars , 1987; de Larouzière et al , 1988; Montenat , 1990; Sanz de Galdeano , 1990; Cloetingh et al , 1992; Montenat and Ott D'Estevou , 1995; Sanz de Galdeano et al , 1995; Morel and Meghraoui , 1996; Alvarez‐Marrón , 1999]. Some segments of these strike‐slip faults show evidence of active faulting during the Quaternary [e.g., Keller et al , 1995; Bell et al , 1997; Reicherter and Reiss , 2001; Faulkner et al , 2003; Martínez‐Díaz and Hernández‐Enrile , 2004; Masana et al , 2004; Gràcia et al , 2006].…”

Section: Tectonic Settingmentioning

confidence: 99%

Present‐day stress field in the Gibraltar Arc (western Mediterranean)

et al. 2007

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The Gibraltar Arc in the western Mediterranean consists of the Betic and Rif Alpine chains and the Alboran Sea Basin. Four types of stress indicators (wellbore breakouts, earthquake focal plane mechanisms, young geologic fault slip data, and hydraulic fracture orientations) indicate a regional NW–SE compressive stress field resulting from Africa‐Eurasia plate convergence. In some particular regions, deviations of SHmax are observed with respect to the regional stress field. They are gentle‐to‐moderate (22°–36°) anticlockwise rotations located along the North Alboran margin and moderate‐to‐significant (36°–78°) clockwise rotations around the Trans‐Alboran Shear Zone (TASZ). This is a broad fault zone composed of different left‐lateral strike‐slip fault segments running from the eastern Betics to the Alhoceima region in the Rif and resulting in a major bathymetric high in the Alboran Sea (the Alboran Ridge fault zone). Some of these stress rotations appear to be controlled by steep gradients of crustal thickness variation across the North Alboran margin and/or differential loading imposed by thick sedimentary accumulations in basin depocenters parallel to the shoreline. Other stress perturbations may be related to active left‐lateral, strike‐slip deformation within the TASZ that crosscuts the entire orogenic arc on a NE–SW trend and represents a key element to understand present‐day deformation partitioning in the western Mediterranean.

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“…Iberia and Africa converge at a very slow rate, 4.5–5.6 mm/yr [ Argus et al , 1989; DeMets et al , 1990, 1994; Kiratzi and Papazachos , 1995; McClusky et al , 2003; Pondrelli , 1999] through a diffuse collisional plate boundary. The width of this boundary has been defined by its seismicity and recent deformation [ McKenzie , 1972; López et al , 1987; Buforn et al , 1995; López et al , 1995; Sanz de Galdeano et al , 1995; Meghraoui et al , 1996]. The area under deformation is 1500 km wide in some parts and includes the Betics, the Pyrenees, the Rif‐Tell, and the Atlas Mountains with the Alboran sea between the Betics and the Rif‐Tell (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

The Alhama de Murcia fault (SE Spain), a seismogenic fault in a diffuse plate boundary: Seismotectonic implications for the Ibero‐Magrebian region

et al. 2004

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[1] The shortening between the African and the Iberian plates is absorbed by a number of faults distributed over a very wide zone with very low slip rates and long periods of seismic loading. Thus a seismotectonic map based only on faults associated with seismicity or with expressive geomorphic features is incomplete. It is possible to characterize seismogenic faults using paleoseismology. First, paleoseismological results based on trenching analysis in the eastern Betics (Lorca-Totana segment of the Alhama de Murcia fault) are presented. The main paleoseismic parameters of this fault segment are (1) a minimum of two to three M w 6.5-7 earthquakes in the last 27 kyr (shortly before 1650 A.D., between 830 and 2130 B.C. and shortly before 16.7 ka, respectively), with a mean recurrence period of 14 kyr, and a very short elapsed time, and (2) a net slip rate of 0.07-0.6 mm/yr during the last 30 kyr. These results were extrapolated to the rest of the known active faults in the eastern Betics and were added to the slip rates of the active faults at the African margin. The total slip rate of the transect, which crosses de Alhama de Murcia fault in Spain and reaches the Cheliff basin (Algeria), would represent 21-82% of the total shortening between Africa and Eurasia estimated from plate motion models and seismic moment summation. A number of factors could account for this discrepancy: (1) hidden seismogenic faults in the emerged areas, (2) absence of correlation between current and late Pleistocene slip rates, (3) extensive small faults that are undetected and that absorb a significant amount of the deformation, and (4) possible overestimation of the convergence rates.

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Shallow seismicity and active faults in the Betic Cordillera. A preliminary approach to seismic sources associated with specific faults

Cited by 55 publications

References 11 publications

Is there an active subduction beneath the Gibraltar orogenic arc? Constraints from Pliocene to present-day stress field

Is there an active subduction beneath the Gibraltar orogenic arc? Constraints from Pliocene to present-day stress field

Present‐day stress field in the Gibraltar Arc (western Mediterranean)

The Alhama de Murcia fault (SE Spain), a seismogenic fault in a diffuse plate boundary: Seismotectonic implications for the Ibero‐Magrebian region

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