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Submarine paleoseismology on the Santa Pola Fault (Bajo Segura Basin, Western Mediterranean): derivating direct on-fault paleoearthquakes

Authors: Perea, Héctor; Gràcia, Eulàlia; Martínez-Loriente, S.; Bartolomé, Rafael;

Submarine paleoseismology on the Santa Pola Fault (Bajo Segura Basin, Western Mediterranean): derivating direct on-fault paleoearthquakes

Abstract

[EN] The Bajo Segura basin is located at the northern termination of the East Betic Shear Zone. The geological evolution of this basin is controlled by a number of active faults and folds that accommodates part of the deformation driven by the convergence between the Nubian and Eurasian plates. The Santa Pola fault is one of the active structures located on the offshore of the Bajo Segura basin. In a high resolution sparker single channel seismic profile we have performed a submarine direct on-fault paleoseismic analysis resulting in the identification of 5 to 10 post-seismic growth sequences. These sequences may be related to 6 to 10 paleoearthquakes occurred between 140 ka and 444 ka, accounting for a recurrence interval ranging from 30 ka to 50 ka. It has also been possible to obtain a long term vertical slip rate, the vertical slip per event and the maximum magnitude of each one

[ES] La cuenca del Bajo Segura está localizada en la terminación norte de la Zona de Cizalla de las Béticas Orientales. La evolución geológica de esta cuenca está controlada por varias estructuras activas que acomodan parte de la deformación derivada de la convergencia entre Nubia y Eurasia. La falla de Santa Pola es una de las estructuras activas localizadas en la zona marina de la cuenca. En un perfil de alta resolución hemos realizado un análisis de paleosismología submarina que ha dado como resultado la identificación de entre 6 y 10 paleoterremotos ocurridos entre 140 ka y 444 ka, resultando en un intervalo de recurrencia que varía entre 30 ka y 50 ka. También ha sido posible obtener una tasa de deslizamiento vertical, el salto vertical por evento y la magnitud máxima para cada uno de ellos

The authors acknowledge the support of the Spanish Ministry of Science and Innovation through National Projects IMPULS (REN2003-05996MAR), EVENT (CGL 2006-12861-C02-02) and SHAKE (CGL 2011-30005-C02-02); Acciones Complementarias EVENT-SHELF (CTM 2008-03346-E/MAR) and SPARKER (CTM 2008-03208-E/MAR); and ESF TopoEurope TOPOMED project (CGL 2008-03474-E/BTE). Hector Perea is fellow researcher at ICM-CSIC under the Juan de la Cierva contract nº JCI-2010-07502 funded by the Spanish Ministry of Science and Innovation

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, 4 figures

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Spain
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Keywords

Bajo Segura Basin, Fallas activas, Cuenca del Bajo Segura, High-resolution seismics, Submarine paleoseismology, Sísmica de alta resolución, Active faults, Paleosismología submarina

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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