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- W1939985003 abstract "An important tool for understanding deformation occurring within a subduction zone is the measurement of seismic anisotropy through observations of shear wave splitting (SWS). In Sumatra, two temporary seismic networks were deployed between December 2007 and February 2009, covering the fore arc between the fore-arc islands to the back arc. We use SKS and local SWS measurements to determine the type, amount, and location of anisotropy. Local SWS measurements from the fore-arc islands exhibit trench-parallel fast directions which can be attributed to shape preferred orientation of cracks/fractures in the overriding sediments. In the Sumatran Fault region, the predominant fast direction is fault/trench parallel, while in the back-arc region it is trench perpendicular. The trench-perpendicular measurements exhibit a positive correlation between delay time and raypath length in the mantle wedge, while the fault-parallel measurements are similar to the fault-parallel fast directions observed for two crustal events at the Sumatran Fault. This suggests that there are two layers of anisotropy: one due to entrained flow within the mantle wedge and a second layer within the overriding crust due to the shear strain caused by the Sumatran Fault. SKS splitting results show a NNW-SSE fast direction with delay times of 0.8–3.0 s. The fast directions are approximately parallel to the absolute plate motion of the subducting Indo-Australian Plate. The small delay times exhibited by the local SWS (0.05–0.45 s), in combination with the large SKS delay times, suggest that the anisotropy generating the teleseismic SWS is dominated by entrained flow in the asthenosphere below the slab." @default.
- W1939985003 created "2016-06-24" @default.
- W1939985003 creator A5021644302 @default.
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- W1939985003 creator A5071988717 @default.
- W1939985003 creator A5082049968 @default.
- W1939985003 creator A5083680007 @default.
- W1939985003 date "2013-10-01" @default.
- W1939985003 modified "2023-10-09" @default.
- W1939985003 title "Seismic anisotropy in the Sumatra subduction zone" @default.
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- W1939985003 doi "https://doi.org/10.1002/jgrb.50157" @default.
- W1939985003 hasPublicationYear "2013" @default.