Paleoseismological data from a new trench across the El Camp Fault(Catalan Coastal Ranges, NE Iberian Peninsula)

H. Perea, P. M. Figueiredo, J. Carner, S. Gambini, K. Boydell

Abstract


The El Camp Fault (Catalan Coastal Ranges, NE Iberian Peninsula) is a slow slipping normal fault whose
seismic potential has only recently been recognised. New geomorphic and trench investigations were carried out
during a training course across the El Camp Fault at the La Porquerola alluvial fan site. A new trench (trench 8)
was dug close to a trench made previously at this site (trench 4). With the aid of two long topographic profiles
across the fault scarp we obtained a vertical slip rate ranging between 0.05 and 0.08 mm/yr. At the trench site,
two main faults, which can be correlated between trenches 8 and 4, make up the fault zone. Using trench analysis
three paleoseismic events were identified, two between 34.000 and 125.000 years BP (events 3 and 2) and another
event younger than 13 500 years BP (event 1), which can be correlated, respectively, with events X (50.000-
125.000 years BP), Y (35.000-50.000 years BP) and Z (3000-25.000 years BP). The last seismic event at the La
Porquerola alluvial fan site is described for the first time, but with some uncertainties.

Keywords


paleoseismicity;trenching;normal fault;Catalan Coastal Ranges;El Camp Fault

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References


DOI: https://doi.org/10.4401/ag-3454
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X