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3-D active source tomography around Simeulue Island offshore Sumatra: Thick crustal zone responsible for earthquake segment boundary ArchiMer
Tang, Genyang; Barton, Penny J.; Mcneill, Lisa C.; Henstock, Timothy J.; Tilmann, Frederik; Dean, Simon M.; Jusuf, Muhammad D.; Djajadihardja, Yusuf S.; Permana, Haryadi; Klingelhoefer, Frauke; Kopp, Heidrun.
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...
Tipo: Text Palavras-chave: Active-source tomography; Sumatra subduction zone; Segmentation; Plate interface.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00137/24834/22916.pdf
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