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

3-D active source tomography around Simeulue Island offshore Sumatra: Thick crustal zone responsible for earthquake segment boundary
3-D active source tomography around Simeulue Island offshore Sumatra: Thick crustal zone responsible for earthquake segment boundary
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
active-source tomography, Sumatra subduction zone, segmentation, plate interface
0094-8276
48-53
Tang, Genyang
51b76ced-0daf-4b61-8f8a-007cdb706e2b
Barton, Penny J
c7ca53e7-b2cb-4a5c-9933-b87460fade2e
McNeill, Lisa C.
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Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Tilmann, Frederik
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Dean, S.M.
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Jusuf, Muhammad D.
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Djajadihardja, Yusuf S.
e4b6fe8a-3cd2-4c81-9fb7-62fe7b8c9346
Permana, Haryadi
b5f42881-f590-449e-b718-506ee3a1d1c8
Klingelhoefer, Frauke
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Kopp, Heidrun
c33e910c-127a-437c-843a-139f4c4380d5
Tang, Genyang
51b76ced-0daf-4b61-8f8a-007cdb706e2b
Barton, Penny J
c7ca53e7-b2cb-4a5c-9933-b87460fade2e
McNeill, Lisa C.
1fe6a1e0-ca1a-4b6f-8469-309d0f9de0cf
Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Tilmann, Frederik
069b7049-5894-49e5-a2a3-bca816a3893b
Dean, S.M.
cb18aac3-e5b5-4c4e-ab7f-4d6138774df0
Jusuf, Muhammad D.
62819bba-5f39-4bfa-a0ba-c1b2a2cac9dd
Djajadihardja, Yusuf S.
e4b6fe8a-3cd2-4c81-9fb7-62fe7b8c9346
Permana, Haryadi
b5f42881-f590-449e-b718-506ee3a1d1c8
Klingelhoefer, Frauke
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Kopp, Heidrun
c33e910c-127a-437c-843a-139f4c4380d5

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

Record type: Article

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

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More information

e-pub ahead of print date: 15 January 2013
Published date: 16 January 2013
Keywords: active-source tomography, Sumatra subduction zone, segmentation, plate interface
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 347417
URI: http://eprints.soton.ac.uk/id/eprint/347417
ISSN: 0094-8276
PURE UUID: 422aa72a-e80f-4b04-96cc-bc155024f663
ORCID for Lisa C. McNeill: ORCID iD orcid.org/0000-0002-8689-5882
ORCID for Timothy J. Henstock: ORCID iD orcid.org/0000-0002-2132-2514

Catalogue record

Date deposited: 22 Jan 2013 09:37
Last modified: 15 Mar 2024 03:09

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Contributors

Author: Genyang Tang
Author: Penny J Barton
Author: Lisa C. McNeill ORCID iD
Author: Frederik Tilmann
Author: S.M. Dean
Author: Muhammad D. Jusuf
Author: Yusuf S. Djajadihardja
Author: Haryadi Permana
Author: Frauke Klingelhoefer
Author: Heidrun Kopp

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