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Surface deformation associated with the M (sub w) 6.4, 24 February 2004 Al Hoceima, Morocco, earthquake deduced from InSAR; implications for the active tectonics along North Africa

Ziyadin Cakir, Mustapha Meghraoui, Ahmet M. Akoglu, Nasser Jabour, Samir Belabbes and Lahsen Ait-Brahim
Surface deformation associated with the M (sub w) 6.4, 24 February 2004 Al Hoceima, Morocco, earthquake deduced from InSAR; implications for the active tectonics along North Africa
Bulletin of the Seismological Society of America (February 2006) 96 (1): 59-68

Abstract

We study the surface deformation associated with the 24 February 2004 Al Hoceima earthquake (M (sub w) 6.4) that recently affected the Rif Mountains of Morocco. The coseismic displacement field is mapped using synthetic aperture radar interferometry (InSAR) with the Envisat (ESA) satellite data acquired in the ascending and descending modes. Our analysis and modeling of InSAR data suggest that the earthquake is associated with a northwest-southeast-trending right-lateral, apparently blind strike-slip fault with a seismic moment reaching 6.8 X 10 (super 18) N m. This result is in contrast with the north-northeast-south-southwest left-lateral fault mechanism inferred from the modeling of seismic waves. Thrust-and-fold structures of the Rif Mountains developed during the Tertiary period, but the recent significant seismic events and late-Quaternary deformation indicate east-west extension accommodated by north-south-trending normal and northwest-southeast- and northeast-southwest-trending conjugate strike-slip faults. The active deformation illustrates the fragmentation of the Rif Mountain range due to the Africa-Iberia collision and west-southwestward escape tectonics.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 96
Serial Issue: 1
Title: Surface deformation associated with the M (sub w) 6.4, 24 February 2004 Al Hoceima, Morocco, earthquake deduced from InSAR; implications for the active tectonics along North Africa
Affiliation: EOST-Institut de Physique du Globe, Strasbourg, France
Pages: 59-68
Published: 200602
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 36
Accession Number: 2006-030985
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch maps
N35°00'00" - N35°12'00", W04°24'00" - W03°47'60"
Secondary Affiliation: Eurasian Institute of Earth Sciences, TUR, TurkeyCNRST, MAR, MoroccoUniversite Mohammed V, MAR, Morocco
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200617
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