Paleoseismic indications along ‘aseismic’ fault segments in the guadalentín depression (SE Spain)

Silva, Pablo G.; Goy, José Luis Goy; Cardeña, Caridad Zazo; Lario, Javier; Bardajı́, Teresa

doi:10.1016/s0264-3707(97)00011-2

Cited by 42 publications

(42 citation statements)

References 11 publications

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“…The distribution of the background seismicity is scattered along the Lorca-Totana, Totana-Alhama and Alhama-Alcantarilla segments. However, there is a significant gap of activity in the Goñar-Lorca segment seismicity (Silva et al 1997;Martínez-Díaz, 1998 andMasana et al, 2004). The gap is very clear from Góñar to the area where the August 2000 sequence took place, between Puerto Lumbreras and Lorca (Fig.…”

Section: Morphology Associated To the Amfmentioning

confidence: 96%

“…These sites are, from north to south (Fig. 4): 1) El Saltador (2 trenches) and El Colmenar (2 trenches) sites, along the SAMF 8-9 km northeast of Lorca Masana et al, 2004); 2) Carraclaca site (natural outcrop), along the NAMF ~ 5 km northeast of Lorca (Silva et al, 1997); 3) Góñar site (6 trenches) at the southern termination of the AMF (Ortuño et al, 2012) and 4) El Ruchete (3 trenches) and Urcal (1 trench) sites, at the Albox fault eastern end (Masana et al, 2005). Table 1 and figure 7 summarize the main results derived from the paleoseismological study of these sites.…”

Section: Paleoearthquake Historymentioning

confidence: 99%

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

Martínez‐Díaz

Masana

Ortuño

2012

Journal of Iberian Geology

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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.Keywords: Alhama de Murcia Fault, Betic Cordillera, active faults, slow-moving faults, strike-slip faults. ResumenEn este estudio se presenta una revisión del conocimiento que hasta la actualidad se tiene de la estructura y comportamiento sismogenético de la Falla de Alhama de Murcia (AMF). Se utiliza un nuevo mapa de la traza de la AMF realizado a partir de un modelo -Díaz et al. / Journal of Iberian Geology 38 (1) 2012: 253-270 Martínez IntroductionThe Alhama de Murcia Fault (AMF) (Bousquet et al., 1979) is a strike-slip shear zone with reverse component that crosses the eastern Betic cordillera with a NE-SW direction ( Fig. 1). The AMF accommodates ~ 0.1 -0.6 mm/yr of the approximately 5 mm/yr of convergence between Nubian and Eurasian plates (Masana et al., 2004) and is one of the largest faults of the Eastern Betics Shear Zone (Silva et al., 1993). Many of the largest damaging historical earthquakes occurred in the eastern Betic Cordillera are related to this structure (Fig. 1).The most damaging earthquake occurred in Spain in the last 50 years took place next to the city of Lorca (11/05 2011, Mw 5.2). In spite of its moderate size this earthquake produced massive damage in this city. This earthquake has been related to the activity of the AMF (i. e. IGME, 2011;Vissers and Meijninger, 2011; LopezComino et al., 2012;. In recent years several studies have focused on the characterization of the paleoseismic activity and the determination of AMF seismic parameters: slip rate, recurrence interval, maximum magnitude Masana et al., 2004, 2005, Masana, 2010Ortuño et al., 2012). All of these parameters were obtained by the study of trenches excavated in sites that were appropriated to identify recent (preferably later Quaternary) surface ruptures. Until now, these studies have been restricted to two of the four segments that form the AMF. The correct interpretation of these data and the correct extrapolation to the whole fault requires a good knowledge of the deep and shallow structure of the fault zone. But this also requires improving our understanding of the relationships between th...

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Section: Morphology Associated To the Amfmentioning

confidence: 96%

Section: Paleoearthquake Historymentioning

confidence: 99%

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

Martínez‐Díaz

Masana

Ortuño

2012

Journal of Iberian Geology

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“…The Pliocene displacement of the Palomares fault cut the Uppermost Tortonian folds, propagating the deformation outwards, towards other structures found further north and south, for example the Carboneras fault [19] and the Alhama de Murcia fault [23,29] respectively, which were active during the Upper Neogene-Quaternary.…”

Section: Discussionmentioning

confidence: 99%

“…1). Further works referred to this fault zone as a transcurrent corridor that was active during most of the Miocene and Quaternary [1,23,29], producing a large horizontal displacement of 15 to 30 km [13,36].…”

Section: Introductionmentioning

confidence: 99%

Uppermost Tortonian to Quaternary depocentre migration related with segmentation of the strike-slip Palomares Fault Zone, Vera Basin (SE Spain)

Booth‐Rea

Azañón

Garcı́a-Dueñas

et al. 2003

Comptes Rendus. Géoscience

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The Palomares Fault Zone (PFZ) is one of the main strike-slip brittle shear zones found in the Betics. It is segmented in several faults that have been active between the Upper Tortonian and present day. Data from drill cores in the Palomares area have permitted us to define the geometry and location of sedimentary depocentres related with the PFZ. These data show an eastward displacement between the Upper Tortonian to Messinian and the Pliocene-Quaternary sedimentary depocentres, towards the presently active Arteal fault, which bounds the western mountain front of Sierra Almagrera, showing that deformation along this fault zone has migrated towards the east, from the Palomares segment, with its main activity during the Upper Tortonian and Messinian, towards the Arteal fault, active during the Pliocene and Quaternary.

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“…The AMF dominates one of the major active range-fronts in the Eastern Betic Chain (Silva et al, 1993). It records important accumulated left-lateral slip (8 to 20 km) from the Messinian to the present (Weijermars, 1987; Silva et al, 1997), but also a significant tectonic uplift (0.04-0.35 mm/yr since Tortonian) (Martínez-Díaz et al, 2012b). Paleoseismological studies show Quaternary slip-rate between 0.08 and 0.5 mm/yr (Masana et al, 2004;Martínez-Díaz et al, 2012a;Ortuño et al, 2012).…”

Section: Geological Settingmentioning

confidence: 99%

Paleoseismological evidence of Holocene activity on Los Tollos Fault (Murcia, SE Spain): A lately formed Quaternary tectonic feature of the Eastern Betic Shear Zone.

Insúa-Arévalo

García-Mayordomo

Salazar

et al. 2016

Journal of Iberian Geology

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The Los Tollos Fault is a recent and important feature of the Eastern Betic Shear Zone, one of the major tectonic structures in South Iberia accommodating the convergence between Nubian and Eurasian plates in the western Mediterranean. The Los Tollos Fault became active by the end of Middle Pleistocene introducing some paleogeographical modifications. Previously mapped as a secondary normal fault related to the Carrascoy Fault, recent research evidences that the Los Tollos Fault is an independent Holocene active left-lateral reverse fault extending for at least 15 km. Data analysis from 4 trenches dug across the fault has revealed the occurrence of at least two paleo-earthquake events during the Holocene. The most recent event is dated between 2,740 and 2,140 yr BP (8th to 2nd centuries BC). The size of the paleoevents is calculated to be Mw 6.3 -6.6 following empirical regressions on surface rupture length. The recurrence interval is estimated to be between 2,200-6,860 years, fitting a slip rate for the fault between 0.12 and 0.17 mm/yr. Such parameters highlight the Los Tollos Fault as a tectonic structure with a considerable activity located relatively close to densely populated areas. These seismogenic parameters should be considered in future reassessments of the seismic hazard of the region.Keywords: Paleoseismology, active faults, Betic Cordillera, Los Tollos Fault, Eastern Betic Shear Zone (EBSZ) Resumen La falla de Los Tollos es una estructura reciente e importante de la Zona de Cizalla de la Bética Oriental, la principal estructura del sureste de la Península Ibérica que acomoda gran parte de la convergencia entre las placas de Eurasia y Nubia en el Mediterráneo Occidental. La falla de Los Tollos, descrita inicialmente como una falla normal secundaria relacionada con la falla de Carrascoy, comenzó su actividad a finales del Pleistoceno Medio generando algunas modificaciones paleogeográficas significativas. El trabajo que aquí presentamos demuestra su activad durante el Holoceno con una cinemática lateral sinestral con componente inversa a lo largo de una longitud de 15 km, e independiente de la Falla de Carrascoy. Del análisis de los datos obtenidos en 4 trincheras paleosismológicas realizadas a lo largo de la traza de la falla, se han podido interpretar la ocurrencia de al menos 2 paleoterremotos durante el Holoceno, acotándose el evento más reciente entre hace 2.740 y 2.140 años (siglos VIII a II a.C.). La magnitud máxima de estos paleoterremotos, estimada mediante correlaciones empíricas que consideran la longitud de rotura en superficie de la falla, se encuentra entre Mw 6,3 y 6,6, con un periodo de recurrencia comprendido entre 2.200 y 6.860 años. La tasa de deslizamiento neta calculada para la falla se estima entre 0,12 y 0,17 mm/a. Estos parámetros identifican la falla de Los Tollos como una estructura activa situada en las cercanías de áreas densamente pobladas y ponen de manifiesto el interés que tendría considerarla en futuras reevaluaciones de la peligrosidad sísmica en la región.Pal...

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Paleoseismic indications along ‘aseismic’ fault segments in the guadalentín depression (SE Spain)

Cited by 42 publications

References 11 publications

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

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

Uppermost Tortonian to Quaternary depocentre migration related with segmentation of the strike-slip Palomares Fault Zone, Vera Basin (SE Spain)

Paleoseismological evidence of Holocene activity on Los Tollos Fault (Murcia, SE Spain): A lately formed Quaternary tectonic feature of the Eastern Betic Shear Zone.

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