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

• Main Authors: K. Boydell, S. Gambini, J. Carner, P. M. Figueiredo, H. Perea
• Format: Article
• Language: English
• Published: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 2003-06-01
• Series: Annals of Geophysics
• Subjects: paleoseismicity; trenching; normal fault; Catalan Coastal Ranges; El Camp Fault
• Online Access: http://www.annalsofgeophysics.eu/index.php/annals/article/view/3454

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.