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Slip-partitioning and fore-arc deformation at the Sunda Trench, Indonesia

Baroux, Emmanuel and Avouac, Jean-Philippe and Bellier, Olivier and Sébrier, Michel (1998) Slip-partitioning and fore-arc deformation at the Sunda Trench, Indonesia. Terra Nova, 10 (3). pp. 139-144. ISSN 0954-4879. doi:10.1046/j.1365-3121.1998.00182.x.

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Oblique subduction at the Sunda Trench has produced transpressive deformation of the plate leading edge. A major feature is the right-lateral Great Sumatran Fault (GSF) which probably absorbs a significant fraction of the trench-parallel shear. The kinematics of Sunda relative to Australia are discussed on the basis of available GPS data, and geologically determined slip rates on the CSF, In spite of the uncertainty on the plate motion, several robust conclusions can be drawn. The predicted obliquity of the convergence increases northward along the Sumatra Trench, up to about 30°, Slip partitioning is nearly complete along the northern segment of the Sumatra Trench, where the CSF probably accommodates most of the trench parallel shear, Along the southern segment, where obliquity is less than about 20°, slip-partitioning is not complete as indicated by oblique thrusting at the subduction. There, only a fraction of the trench parallel motion of Australia relative to SE Asia is accommodated along the CSF, These observations suggest that the leading edge behaves like a plastic wedge, except that slip-partitioning, although incomplete, is observed even at low obliquities.

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Avouac, Jean-Philippe0000-0002-3060-8442
Additional Information:© 1998 Blackwell Science Ltd. Received 3 July 1998; revised version accepted 20 October 1998. Article first published online: 21 Apr. 2002. This study benefited from comments and suggestions by Gilles Peltzer, Eric Calais, Michel Diament and Philippe Huchon. We thank Robert MacCaffrey for their thoughtful critics and Serge Lallemand and Jacques Malod for the reviews.
Group:Seismological Laboratory
Issue or Number:3
Record Number:CaltechAUTHORS:20120907-131002862
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Official Citation:Baroux, Avouac, Bellier and Sébrier (1998), Slip-partitioning and fore-arc deformation at the Sunda Trench, Indonesia. Terra Nova, 10: 139–144. doi: 10.1046/j.1365-3121.1998.00182.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33936
Deposited By: Tony Diaz
Deposited On:07 Sep 2012 20:38
Last Modified:09 Nov 2021 23:05

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