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Provedor de dados:  ArchiMer
País:  France
Título:  3-D active source tomography around Simeulue Island offshore Sumatra: Thick crustal zone responsible for earthquake segment boundary
Autores:  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
Data:  2013-01
Ano:  2013
Palavras-chave:  Active-source tomography
Sumatra subduction zone
Plate interface
Resumo:  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.
Tipo:  Text
Idioma:  Inglês

Editor:  Amer Geophysical Union
Formato:  application/pdf
Fonte:  Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2013-01 , Vol. 40 , N. 1 , P. 48-53
Direitos:  2012. American Geophysical Union. All Rights Reserved.

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