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handle: 10261/113797
[EN] The Alhama de Murcia fault is a left-lateral strike-slip fault with a reverse component. Previous paleoseismic studies demonstrated its seismogenic nature but they did not obtained well constrained slip rate values, a good indicator of the seis mic potential of a fault. In this paper we present new results from 3D trenching at the El Saltador site (between Lorca and Totana) with the aim to estimate the first tentative lateral slip rate for the AMF. We excavated nine new trenches and identified several channels that can be correlated on both sides of the fault. These channels indicate offsets that range between 20.2 and 7.6 m and are less than 23,883-23,279 B.C. calibrated age. The derived left-lateral slip-rate ranges between 0.29 and 0.80 mm/yr, a larger rate than considered in prior studies for the AMF.Work is still in progress to better constrain the ages of the offset channels
[ES] La Falla de Alhama de Murcia (FAM, SE Península Ibérica) es una falla de salto en dirección izquierda con componente vertical. Estudios paleosísmicos previos caracterizaron la falla como sismogénica pero no consiguieron acotar de forma precisa su velocidad lateral, lo que limita el conocimiento real de su peligrosidad. Se presenta un estudio de trincheras 3D en el paraje de El Saltador (entre Lorca y Totana) con el objetivo de estimar la velocidad de deslizamiento lateral de la FAM. Se han identificado dos paleocanales de una edad calibrada máxima de 23,883-23,279 aC. dislocados lateralmente entre 20.2 y 7.6 m. Con estos valores, la velocidad mínima de deslizamiento lateral de la FAM es mayor a la considerada hasta el momento: 0.29-0.80 mm/año. Estos trabajos siguen en curso y se prevé mejorar la acotación temporal de esta dislocación
The authors were supported by research projects: CGL2011-30005-C02-02 SHAKE from the Spanish Ministry of Science and Innovation; and Project LE311A12-2 from Junta de Castilla y León. Fundings for the postdoctoral and doctoral fellowships were provided by Spanish Ministry of Economy and Competitivity (Juan de la Cierva fellowship for H. Perea), Spanish Ministry of Education, Culture and Sport (FPU fellowship for M. Ferrater) and by the University of Barcelona (APIF fellowship for A. Echeverria)
Ferrater, M. ... et. al.-- Inciativa Ibérica para el Estudio de las Fallas Activas, Segunda Reunión Ibérica sobre Fallas Activas y PaleosismologíaI IBERFAULT 2014, 22-24 de octubre de 2014, Lorca, España.-- 4 pages, 5 figures, 1 table
Peer reviewed
Lateral slip-rate, Velocidad deslizamiento, 3D software, Falla de salto en dirección, Left-lateral strike-slip fault, 3D trenches, Trincheras 3D
Lateral slip-rate, Velocidad deslizamiento, 3D software, Falla de salto en dirección, Left-lateral strike-slip fault, 3D trenches, Trincheras 3D
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