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

Silva, Pablo G.; Bardajı́, Teresa; Calmel-Avila, Maryvonne; Goy, José Luis; Cardeña, Caridad Zazo

doi:10.1016/j.geomorph.2007.10.023

Cited by 38 publications

(86 citation statements)

References 26 publications

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“…The metamorphic substratum is covered by materials of Miocene age that include marls, sands, conglomerates and calcarenites. On the top of these, there is a succession formed by conglomerates, sands, silts and clay constituting Plio-Quaternary alluvial fans [26]. The Alto Guadalentín detritic aquifer, located between the cities of Lorca and Puerto Lumbreras, developed in the Plio-Quaternary deposit.…”

Section: Study Areamentioning

confidence: 99%

Interpolation of GPS and Geological Data Using InSAR Deformation Maps: Method and Application to Land Subsidence in the Alto Guadalentín Aquifer (SE Spain)

et al. 2016

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Land subsidence resulting from groundwater extractions is a global phenomenon adversely affecting many regions worldwide. Understanding the governing processes and mitigating associated hazards require knowing the spatial distribution of the implicated factors (piezometric levels, lithology, ground deformation), usually only known at discrete locations. Here, we propose a methodology based on the Kriging with External Drift (KED) approach to interpolate sparse point measurements of variables influencing land subsidence using high density InSAR measurements. In our study, located in the Alto Guadalentín basin, SE Spain, these variables are GPS vertical velocities and the thickness of compressible soils. First, we estimate InSAR and GPS rates of subsidence covering the periods 2003-2010 and 2004-2013, respectively. Then, we apply the KED method to the discrete variables. The resulting continuous GPS velocity map shows maximum subsidence rates of 13 cm/year in the center of the basin, in agreement with previous studies. The compressible deposits thickness map is significantly improved. We also test the coherence of Sentinel-1 data in the study region and evaluate the applicability of this methodology with the new satellite, which will improve the monitoring of aquifer-related subsidence and the mapping of variables governing this phenomenon.

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Section: Study Areamentioning

confidence: 99%

Interpolation of GPS and Geological Data Using InSAR Deformation Maps: Method and Application to Land Subsidence in the Alto Guadalentín Aquifer (SE Spain)

et al. 2016

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“…This observation might lead us to consider the LTF as a segment of a major structure together with the Carrascoy fault. However, it has been shown in on-going investigations block, what could have blocked the access to the Mediterranean Sea of the Guadalentin River through the Campo de Cartagena basin, producing an endorheic environment (Silva et al, 2008) on the northern downthrown block. Hence, the age of formation of the fault could be related with the onset of the endorheic conditions of the Guadalentin Depression after the blockage of the river flow to the SE at the end of the Middle Pleistocene (Silva, 1994).…”

Section: Discussionmentioning

confidence: 99%

“…2). The basin has a complex infilling history with a transition from marine to continental environments during the Plio-Pleistocene (Leyva Cabello et al, 2010), reaching the Holocene as an endorheic basin at its southernmost part (South of Alhama de Murcia town) (Silva et al, 2008). The basin is sharply bounded by the uplifted Late Neogene deposits of the Lorca and Fortuna Basins and the Espuña Range (Internal Zones) to the northwest.…”

Section: Geological Settingmentioning

confidence: 99%

“…Additionally, from this point to the SW, the Guadalentin river shows a conspicuous NE-SW straight trend for 5 km approx. This morphologic feature is known as La Alcanara, interpreted as a channel dug during the Roman times to connect Guadalentin and Sangonera rivers (Silva et al, 2008), suggesting that the builders took advantage of a previous topography that may be controlled by the fault. The length of the whole fault trace, considering the Alcanara channel, is 15 km.…”

Section: Trenches Acopios 1 and Acopiosmentioning

confidence: 99%

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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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“…In any case, the strategy of transformation of old distributary channels of deltas (or alluvial fans) in well-developed irrigation systems was imported by the Egyptian people (Yund Army) occupying the zone since the 9 th century AD, as illustrated by the irrigation systems developed in the alluvial fans of the Segura River at Murcia, and the Guadalentín River at Lorca (i.e. Pocklington, 1989;Silva et al, 2008). Figure 5 illustrates the most probable geometry and features of the Segura river-delta protruding into the old estuarine zone.…”

Section: The Ancient Delta Of the Segura River And Population Of The mentioning

confidence: 99%

Seismic palaeogeography of coastal zones in the Iberian Peninsula: Understanding ancient and historic earthquakes in Spain.

Silva

Bardajı́

Roquero

et al. 2015

CyG

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Roman city of Baelo Claudia located in the Bolonia Bay (Strait of Gibraltar); and the effects of the earthquake of AD 1048on the ancient Sinus Ilicitanus (Bajo Segura Depression) during Muslim times. Descriptions from Roman and Arabic geographers are cross-checked with existing palaeogeographic models based on geological data. This type of analysis results in ancient macroseismic scenarios for the interpretation of theoretical distributions of intensities and environmental effects supporting the concept of "seismic palaeogeography" proposed in this paper.Keywords: Palaeoseismology, Archaeosismology, Palaeogeography, ancient earthquake, littoral zone, South Spain. ResumenEl presente trabajo recoge tres ejemplos de terremotos antiguos (218 AC, 40-60 AD y 1048 AD) ocurridos en zonas litorales del S y SO de la Península Ibérica con la intención de ilustrar el uso de datos geológicos y arqueológicos en la caracterización macrosísmica de los mismos. En la mayor parte de los sísmos ocurridos con anterioridad al siglo X d.C. la información documental histórica que se posee es muy escasa o inexistente. El presente trabajo muestra que el actual estado de conocimiento en paleosismología y arqueosismologia sobre este tipo de terremotos sobrepasa con creces la información documental histórica, permitiendo la multiplicación de los puntos de información macrosísmica mediante el uso de la escala ESI-07 (Environmental Seismic Intensity). Consecuentemente, el análisis geológico de los terremotos antiguos mejora su conocimiento y análisis paramétrico, permitiendo avanzar la evaluación de la peligrosidad sísmica de las zonas afectadas. El aspecto que se pone de especial relieve en este trabajo es el análisis de la paleogeografía existente en la antigüedad, ya que todas las zonas (afectadas) analizadas en este trabajo corresponden a zonas estuarinas abiertas que se han ido rellenado por aportes fluviales o de forma artificial con el tiempo. Se analizan los efectos del terremoto de 218 AC en las zonas estuarinas del Golfo de Cádiz y muy especialmente en el antiguo Lacus Ligustinus (marismas del Guadalquivir) durante época romana; los efectos del terremoto de 40-60 AD en la antigua Bahía de Baelo Claudia (Estrecho de Gibraltar); y los efectos del terremoto de 1048 AD en el antiguo Sinus ilicitanus (Depresión del Bajo Segura) durante época musulmana. Se han cotejado descripciones de geógrafos romanos y árabes con modelos basados en datos geológicos. Este tipo de análisis ha permitido generar antiguos escenarios macrosísmicos basados en la paleogeografía y reinterpretar las distribuciones teóricas de intensidades y los efectos ambientales de los terremotos estudiados que es a lo que se refiere el concepto de "paleogeografía sísmica" propuesto en este trabajo.

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

Cited by 38 publications

References 26 publications

Interpolation of GPS and Geological Data Using InSAR Deformation Maps: Method and Application to Land Subsidence in the Alto Guadalentín Aquifer (SE Spain)

Interpolation of GPS and Geological Data Using InSAR Deformation Maps: Method and Application to Land Subsidence in the Alto Guadalentín Aquifer (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.

Seismic palaeogeography of coastal zones in the Iberian Peninsula: Understanding ancient and historic earthquakes in Spain.

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