The Constantine (northeast Algeria) earthquake of October 27, 1985: surface ruptures and aftershock study

Details The Constantine (northeast Algeria) earthquake of October 27, 1985: surface ruptures and aftershock study The Constantine (northeast Algeria) earthquake of October 27, 1985: surface ruptures and aftershock study

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..85..451b&link_type=abstract

Earth and Planetary Science Letters, Volume 85, Issue 4, p. 451-460.

Astronomy and Astrophysics

Astrophysics

10

Scientific paper

An earthquake of magnitude Ms = 6.0 (CSEM, Strasbourg) occurred at Constantine (Algeria) on 27 October 1985. This seismic event is the strongest felt in the Tellian Atlas since the El Asnam seismic crisis of October 10, 1980. A team from the Centre de Recherche d'Astronomie, d'Astrophysique et de Géophysique (CRAAG, Algeria), utilising 8 portable stations, registered the activity a few days after the main shock. The aftershocks follow a N045° direction, and show the existence of three ruptured segments. Cross sections display a remarkable vertical fault plane and suggest asperities in the rupture process. Surface breaks were found affecting Quaternary deposits. The principal segment is about 3.8 km long showing ``en échelon'' cracks with left-lateral displacement while the main direction of the rupture is N055°. Although the vertical motion is small, the northwestern block shows a normal component of the main surface faulting, while the left-lateral displacement is about 10 cm. The strike-slip focal mechanism solution determined from the global seismic network and field observations are in good agreement.
Present address: Laboratoire de Tectonique, Institut de Physique du Globe, 4 place Jussieu, 75252 Paris Cédex 05, France.

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