3-D active source tomography around Simeulue Island offshore Sumatra: thick crustal zone responsible for earthquake segment boundary.

Tang, Genyang, Klingelhoefer, Frauke, Kopp, Heidrun , Barton, Penny, McNeill, Lisa C., Henstock, Timothy J, Tilmann, Frederik, Dean, Simon M, Jusuf, Muhammad D., Djajadihardja, Yusuf S and Permana, Haryadi (2013) 3-D active source tomography around Simeulue Island offshore Sumatra: thick crustal zone responsible for earthquake segment boundary. Open Access Geophysical Research Letters, 40 (1). pp. 48-53. DOI 10.1029/2012GL054148.

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Abstract

We present a detailed 3-D P-wave velocity model obtained by first-arrival travel-time tomography with seismic refraction data in the segment boundary of the Sumatra subduction zone across Simeulue Island, and an image of the top of the subducted oceanic crust extracted from depth-migrated multi-channel seismic reflection profiles. We have picked P-wave first arrivals of the air-gun source seismic data recorded by local networks of ocean-bottom seismometers, and inverted the travel-times for a 3-D velocity model of the subduction zone. This velocity model shows an anomalous zone of intermediate velocities between those of oceanic crust and mantle that is associated with raised topography on the top of the oceanic crust. We interpret this feature as a thickened crustal zone in the subducting plate with compositional and topographic variations, providing a primary control on the upper plate structure and on the segmentation of the 2004 and 2005 earthquake ruptures.

Document Type: Article
Additional Information: WOS:000317826300010
Keywords: megathrust earthquakes, 3-D seismic tomography, subduction zone, Sumatra, crustal structure; ANDAMAN EARTHQUAKE; RUPTURE; DEFORMATION; MEGATHRUST; SUBDUCTION; SEAMOUNTS; PRISM; OCEAN; SLIP
Research affiliation: GFZ
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2012GL054148
ISSN: 0094-8276
Expeditions/Models/Experiments:
Date Deposited: 05 Feb 2013 10:13
Last Modified: 20 Jun 2017 06:55
URI: http://oceanrep.geomar.de/id/eprint/20249

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