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Mesures topographiques sur le segment SW de Ia zone faillée d'El Asnam et interprétation mécanique des relations entre failles inverses et normales

Meyer, Bertrand and Avouac, Jean-Philippe and Tapponnier, Paul and Meghraoui, Mustapha (1990) Mesures topographiques sur le segment SW de Ia zone faillée d'El Asnam et interprétation mécanique des relations entre failles inverses et normales. Bulletin de la Société Géologique de France, 8 (3). pp. 447-456. ISSN 0037-9409. http://resolver.caltech.edu/CaltechAUTHORS:20120920-082609701

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Abstract

Using topographic measurements, we document the relationship between thrust movement along the SW segment of the El Asnam fault, and normal movements on secondary faults in the hanging wall. Cumulative displacements of calcarenite beds on the normal faults of this segment correspond to an increasing number of seismic events towards the north. This suggests a southwards propagation of the faulted structure. In the zone between the SW and central segments of the El Asnam fault, near Zebabdja, one sees the passage from the reverse fault, activated in 1980 to a normal fault. This observation, and the monoclinal lithology, suggest that normal faults merge with the main reverse faults plane where bedding forces this plane to dip more gently. These normal faults, which strike perpendicular to the regional compressive stress, maintain the kinematic compatibility between over and underthrusted blocks. These observations allow us to propose a kinematic model for the SW segment of El Asnam fault zone.


Item Type:Article
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http://www.geoscienceworld.org/georef?georef=1992058462#f-displayPublisherUNSPECIFIED
Alternate Title:Topographic measurements along SW segment of El Asnam fault zone and mechanical interpretation of the relationships between thrust and normal faults
Additional Information:© 1990 American Geosciences Institute. Nous remercions l' Institut national des Sciences de l'Univers (INSU) et le Centre de Recherche d 'Astronomie d 'Astrophysique et de Gé ophysique (CRAAG) pour leur soutien financier et logistique. Cette étude doit beaucoup aux discussions fructueuses que nous avons eues avec Rolando Armijo. Nous tenons à remercier Anne Briais et Yves Gaudemer pour leur critique pertinente du manuscrit et Guy Aveline qui a assuré la réalisation des figures. Les auteurs remercient Jean-Claude Bousquet et Arnaud Etchecopar pour les avoir invité, par leurs critiques et remarques, a clarifier Ia présentation des résultats.
Funders:
Funding AgencyGrant Number
Institut national des sciences de l'Univers (INSU) (France)UNSPECIFIED
Centre de Recherche d'Astronomie, d'Astrophysique et de Geophysique (CRAAG)UNSPECIFIED
Subject Keywords:active faults; Africa; Algeria; displacements; El Asnam Fault; fault scarps; fault zones; faults; kinematics; models; normal faults; North Africa; reverse faults; structural geology
Record Number:CaltechAUTHORS:20120920-082609701
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120920-082609701
Official Citation:B. Meyer, J. P. Avouac, P. Tapponnier and M. Meghraoui Mesures topographiques sur le segment SW de la zone faillee d'El Asnam et interpretation mecanique des relations entre failles inverses et normalesTopographic measurements of the southwestern segment of the El Asnam fault zone and mechanical interpretation of the relationship between reverse and normal faults Bulletin de la Societe Geologique de France (May 1990), 6(3):447-456
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34253
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Nov 2012 18:48
Last Modified:19 Nov 2012 18:48

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