The M-w 7.9, 12 May 2008 Sichuan earthquake rupture measured by sub-pixel correlation of ALOS PALSAR amplitude images | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  The M-w 7.9, 12 May 2008 Sichuan earthquake rupture measured by sub-pixel correlation of ALOS PALSAR amplitude images

Type de publication:

Journal Article

Source:

Earth Planets and Space, Volume 62, Ticket 11, p.875-879 (2010)

ISBN:

1343-8832

Numéro d'accès:

ISI:000287478900005

URL:

http://www.terrapub.co.jp/journals/EPS/abstract/6211/62110875.html

Mots-clés:

amplitude offsets., earthquake, PALSAR, rupture, UMR 7154 ; Tectonique et Mécanique de la Lithosphère ; Sichuan

Résumé:

PALSAR L-band spaceborne Synthetic Aperture Radar (SAR) amplitude images are used to map the Sichuan earthquake rupture (China, M-w 7.9, 12 May 2008) and to identify the faults activated by the earthquake. A sub-pixel correlation method is used to retrieve the coseismic displacement field projected into the line of sight of the satellite and the horizontal along-track direction, and to map the surface rupture. The earthquake broke similar to 270 km of the Beichuan fault and similar to 70 km of the Guanxian fault, with a complex thrust-dextral slip mechanism. Along the southwestern part of the rupture, slip seems to be partitioned into a dextral-dominant component on the Beichuan fault and a thrust-dominant component on the Guanxian fault. Dextral slip may also be dominant at the northeastern tip of the Beichuan ruptured fault. Coseismic surface displacements reach on average 3 to 4 m in both measured directions. The SAR rupture mapping has proven complementary to field studies extending the zone of co-seismic displacements and identifying other possible co-seismic rupture strands.

Notes:

de Michele, Marcello Raucoules, Daniel Lasserre, Cecile Pathier, Erwan Klinger, Yann Van der Woerd, Jerome de Sigoyer, Julia Xu, Xiwei