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1982•Bulletin of the Seismological Society of AmericaRequires access

Models of the complex source of the El Asnam earthquake

A. Cisternas, J. Dorel, R. Gaulon

Open publisher page 50 citations

Abstract

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.

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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.

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Available abstract

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.

Key concepts: Hypocenter, Seismology, Geology, Thrust fault, Fault (geology), Seismic gap, Thrust, Normal fault

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