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Models of the complex source of the El Asnam earthquake

INSTITUTE DE PHYSIQUE DU GLOBE DE PARIS LABORATORIE D'ETUDE GÉOPHYSIQUE DES STRUCTURES PROFONDES ASSOCIÉ AU CNRS UNIVERSITÉ PIERRE ET MARIE CURIE, 4, PLACE JUSSIEU—TOUR 14, 75230 PARIS CEDEX 05, France

Abstract

The El Asnam earthquake of 10 October 1980 was originated by a thrust across a SW-NE-oriented fault 36 km long and 15 km wide. It is a complex event with a rupture propagating from the SW to the NE. Fault mapping, hypocenter distribution, and b factor studies indicate fault branching to the NE.

A dislocation model is used to explain the branch with normal faulting at Beni-Rached as a consequence of the thrust across a main fault that changes orientation. The mechanism of the 1954 earthquake must be similar even though only normal faulting was observed at the surface.