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Preliminary geologic, geomorphologic and geophysical studies for the paleoseismological analysis of the Amer fault (NE Spain)

Published online by Cambridge University Press:  01 April 2016

J. Fleta ,
P. Santanach ,
X. Goula ,
P. Martínez ,
B. Grellet  and
E. Masana
J. Fleta
Affiliation:
Institut Cartogràfic de Catalunya, Parc de Montjuïc, 08038 Barcelona, Spain. E-mail: [email protected]
P. Santanach
Affiliation:
Dept. Geodinàmica i Geofisica, Universitat de Barcelona, Zona Universitària de Pedralbes, 08028 Barcelona, Spain
X. Goula
Affiliation:
Institut Cartogràfic de Catalunya, Parc de Montjuïc, 08038 Barcelona, Spain. E-mail: [email protected]
P. Martínez
Affiliation:
Institut Cartogràfic de Catalunya, Parc de Montjuïc, 08038 Barcelona, Spain. E-mail: [email protected]
B. Grellet
Affiliation:
Geo-Ter S.A.R.L. 3, rue Jean Monnet, 34830 Clapiers, France
E. Masana
Affiliation:
Dept. Geodinàmica i Geofisica, Universitat de Barcelona, Zona Universitària de Pedralbes, 08028 Barcelona, Spain

Abstract

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The Amer fault is a 30 km long normal fault, which generated the damaging earthquakes of March and May 1427. Triangular facets, wine glass drainage basins, alluvial fans and scarps along the Amer fault mountain front provide evidence of its recent activity. Topographic profiling, electrical logging, tomographic and high-resolution seismic profiling along the northern segment of the Amer fault showed the following: i) no evidence of surface deformation in recent deposits; ii) fault scarps produced by the Amer fault located only on old alluvial fans, probably Pleistocene in age, and iii) Amer fault related deformation reaching upper Quaternary levels, but not the uppermost horizons. The high sedimentation rate (nearly one order of magnitude greater than the fault slip rate) due to the filling of the lake, which resulted from the damming of the Fluvià river by the Bosc de Tosca lava flow (17,000 yr BP), can account for the absence of surface deformation on Holocene sediments.

Keywords

Active faultingGeomorphologyGeophysical prospectingEarthquakesEastern Pyrenees
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 80 , Issue 3-4 , December 2001 , pp. 243 - 253
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2001

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