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GEOPHYSICAL RESEARCH LETTERS,
VOL. 35,
L20303,
5 PP., 2008
doi:10.1029/2008GL035262
Complex slab subduction beneath northern Sumatra
Department of Geology and Geophysics, University of Wisconsin-Madison, Madison, Wisconsin, USA
Department of Geology and Geophysics, University of Wisconsin-Madison, Madison, Wisconsin, USA
Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, Indonesia
Department of Physics, University of Colorado, Boulder, Colorado, USA
Center for Earthquake Research and Information, University of Memphis, Memphis Tennessee, USA
New data provided by the 2004–2005 Sumatra-Andaman great earthquake sequences allow us to image with improved detail the P-wave velocity structure beneath Sumatra and adjacent regions. Below northern Sumatra, we find that the slab is folded at depth, exhibiting geometry similar to that of the volcanic arc and the trench at the surface. We speculate that this fold plays a major role in the segmentation of the Sumatra megathrust, and may impede rupture propagation in the region. North of Sumatra, significant slab material in the mantle transition zone is imaged for the first time, and we infer the presence of a major tear between the upper mantle and transition zone there.
Received 9 July 2008; accepted 17 September 2008; published 21 October 2008.
Citation: (2008), Complex slab subduction beneath northern Sumatra, Geophys. Res. Lett., 35, L20303, doi:10.1029/2008GL035262.
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