The Librilla “rambla”, an example of morphogenetic crisis in the Holocene (Murcia, Spain)

Calmel-Avila, Maryvonne

doi:10.1016/s1040-6182(02)00009-5

Cited by 20 publications

(60 citation statements)

References 7 publications

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“…This range of time could be bounded between 2,740 and 2,500 cal. yr BP if we consider the age of the regional fluvial incision (Calmel-Avila, 2002). This is the last earthquake with surface rupture produced by the LTF which is consistent with the lack of large historical earthquakes records in the seismic catalogue for this area (Fig.…”

Section: Discussionsupporting

confidence: 81%

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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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Section: Discussionsupporting

confidence: 81%

“…This age is consistent with the date given for the beginning of the main fluvial incision at this sector of the Guadalentin basin in ~2,500 cal. yr BP (Calmel-Avila, 2002). Therefore, the earthquake should have taken place between 2,740 and 1,880 (or 2,500) cal.…”

Section: Discussionmentioning

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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“…However, major incision events did not take place until 2500 yr BP (Late Bronze Age), when headward erosion reached the central sector of the Guadalentín Depression at Librilla (Fig. 2) inducing an incision up to 16 m (Calmel-Avila, 2002;Calmel-Avila et al, 2005). Semi-endorheic conditions remained in the centralmost zone of the depresion (Totana zone, Fig.…”

Section: Climate and Sedimentationmentioning

confidence: 99%

“…To the north, uplift and dissection of the Late Neogene basins occurred throughout the Pleistocene, with examples in the Almanzora and Vera basins (Stokes and Mather, 2003) during the Early-Middle Pleistocene, and the Mula Basin during the Late Pleistocene (Mather et al, 1995). Aside from local examples of deep incision (Calmel-Avila, 2002;García et al, 2003) or punctuated aggradation (Candy et al, 2004) the degree of dissection progressively diminishes towards the north throughout the EBSZ. In that zone, the Guadalentín (Murcia region) and Lower Segura depressions (Alicante region), located within the principal displacement zone of the EBSZ (Silva et al, 1993), prevailed as active aggradational basins until at least the Early Holocene.…”

Section: Introductionmentioning

confidence: 99%

“…Sensitivity of alluvial fan catchments to the Late Quaternary climatic changes, and especially to the progressive aridification of SE Spain from Late Pleistocene deglaciation to Late Holocene times (Calmel-Avila, 2002;Silva et al, 2003), increased basin dissection facilitating the eventual integration of ancient fan channels into the regional base-level controlled drainage network. Increasing aridity diminished the available water in fan catchments, leading to fan surface-fan channel system reaching the threshold for "very-limited distal aggradation conditions" and the consequent downfan propagation of distal trenching by the generation of successive headcuts along the main fan channel.…”

Section: Introductionmentioning

confidence: 99%

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Transition from alluvial to fluvial systems in the Guadalentín Depression (SE Spain) during the Holocene: Lorca Fan versus Guadalentín River

et al. 2008

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New insights on the seismogenic potential of the Eastern Betic Shear Zone (SE Iberia): Quaternary activity and paleoseismicity of the SW segment of the Carrascoy Fault Zone

et al. 2016

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The Carrascoy Fault (CAF) is one of the main active faults that form part of the Eastern Betic Shear Zone, a 450 km fault system that accommodates most of the convergence between the Eurasian (Iberia) and Nubian plates in the Betic Cordillera, south Spain. Although the CAF represents a major earthquake threat to the nearby City of Murcia, studies on its Quaternary tectonics and seismogenic potential are scarce to date. We present evidence that supports the division of the CAF into two overlapping segments with contrasting tectonic structure, Quaternary activity, and landform control: a SW segment, characterized by a broad fold-and-thrust zone similar to the forebergs defined in the Gobi-Altai region, and a NE segment, characterized by a sharp mountain front controlled by strike-slip tectonics. We attribute the differentiation into these two segments to the stresses associated with topography, which in turn is a consequence of the shortening component, at the middle Pleistocene, after circa 217.4 ka. For the SW segment we infer the occurrence of 9 to 11, M w 6.7 paleoearthquakes in the last 30.2 kyr, and a slip rate of 0.37 ± 0.08 m/kyr. We date the occurrence of the last surface rupture event after 2750 B.P., and we estimate an average recurrence period of major events of 3.3 ± 0.7 kyr.

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The Librilla “rambla”, an example of morphogenetic crisis in the Holocene (Murcia, Spain)

Cited by 20 publications

References 7 publications

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

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

Transition from alluvial to fluvial systems in the Guadalentín Depression (SE Spain) during the Holocene: Lorca Fan versus Guadalentín River

New insights on the seismogenic potential of the Eastern Betic Shear Zone (SE Iberia): Quaternary activity and paleoseismicity of the SW segment of the Carrascoy Fault Zone

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