26th December 2004 great Sumatra-Andaman earthquake: Co-seismic and post-seismic motions in northern Sumatra

Type Article
Date 2007-11
Language English
Author(s) Sibuet Jean-Claude1, Rangin C2, Le Pichon X2, Singh S3, Cattaneo AntonioORCID1, Graindorge D1, Klingelhoefer FraukeORCID1, Lin Jing-Yi1, Malod Jacques-Andre1, 4, Maury Tanguy1, Schneider J1, Sultan NabilORCID1, Umber Marie1, Yamaguchi H5
Affiliation(s) 1 : Ifremer Centre de Brest, B.P. 70, 29280 Plouzané cedex, France
2 : Collège de France, Chaire de Géodynamique and CNRS CEREGE, Europôle de l'Arbois, BP 80, 13545 Aix en Provence, France
3 : Institut de Physique du Globe de Paris, 4 Place Jussieu, Tour 14-15, 5th Floor, 75252 Paris cedex 05, France
4 : Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280 Plouzané, France
5 : Institute for Research on Earth's Evolution, Japan Agency for Marine-Earth Science and Technology, Natsushima-cho 2-15, Yokosuka, 237-0061, Japan et Océanographie, Avenue des Facultés, 33405 Talence cedex, France
6 : Université Bordeaux 1, Observatoire Aquitain des Sciences de l'Univers, Département de Géologie et Océanographie, Avenue des Facultés, 33405 Talence cedex, France
Source Earth and Planetary Science Letters (0012-821X) (Elsevier), 2007-11 , Vol. 263 , N. 1-2 , P. 88-103
DOI 10.1016/j.epsl.2007.09.005
WOS© Times Cited 71
Keyword(s) Active thrust faults, Co seismic rupture, Aftershocks, 2004 Sumatra Andaman earthquake
Abstract Trench-parallel thrust faults verging both landward and seaward were mapped in the portion of wedge located between northern Sumatra and the Indian-Indonesian boundary. The spatial aftershocks distribution of the 26th December 2004 earthquake shows that the post-seismic motion is partitioned along two thrust faults, the Lower and Median Thrust Faults, the latter being right-laterally offset by a N-S lower plate fracture zone located along the 93.6 degrees N meridian. Between February 2005 and August 2005, the upper plate aftershock activity shifted from southeast of this fracture zone to northwest of it, suggesting that the lower plate left-lateral motion along the fracture zone may have induced a shift of the upper plate post-seismic activity along the Median Thrust Fault. Based on swath bathymetric and 3.5 kHz data, co-seismic deformations were weak close to the trench. Joint seismic-geodetic determination of slip distribution and time arrivals and heights of tsunami waves suggest that the co-seismic slip was maximum along a portion of the Upper Thrust Fault located north of the Tuba Ridge, suggesting that the Upper Thrust Fault might be a splay fault originated at the interplate fault plane. As the Upper Thrust Fault is steeper than the slab, the vertical motion of the adjacent Outer Arc and overlying water is much larger compared to the one resulting from slip on the megathrust alone, increasing tsunamogenic effects.
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Sibuet Jean-Claude, Rangin C, Le Pichon X, Singh S, Cattaneo Antonio, Graindorge D, Klingelhoefer Frauke, Lin Jing-Yi, Malod Jacques-Andre, Maury Tanguy, Schneider J, Sultan Nabil, Umber Marie, Yamaguchi H (2007). 26th December 2004 great Sumatra-Andaman earthquake: Co-seismic and post-seismic motions in northern Sumatra. Earth and Planetary Science Letters, 263(1-2), 88-103. Publisher's official version : https://doi.org/10.1016/j.epsl.2007.09.005 , Open Access version : https://archimer.ifremer.fr/doc/00000/3508/