NDLI: Seismic anisotropy surrounding South China Sea and its geodynamic implications

Content Provider	Springer Nature Link
Author	Xue, Mei Le, Khanh Phon Yang, Ting
Copyright Year	2013
Abstract	Several mechanisms have been proposed for the opening of the South China Sea. Here, we use SKS splitting analysis to investigate the mantle flow surrounding the South China Sea. We use a total of 23 seismic stations and 87 events. We applied spectral analysis and cluster analysis to find a stable splitting solution for each event. The main conclusions are: (1) In northern Vietnam, the NW–SE fast direction is parallel to the absolute plate motion as well as GPS observations with splitting times larger than 1 s, indicating a coupled lithosphere and mantle. In contrast, in southern Vietnam, the NE–SW fast direction suggests that the lithosphere and asthenosphere are decoupled. (2) The fast directions beneath the South China Block and central Taiwan are NE–SW and NS respectively, both parallel to surface deformations with splitting times greater than 1 s, indicating that mantle flow and surface deformation are related. (3) The observed NW–SE fast directions beneath Hainan Island reflect the India–Eurasia collision, and show no signatures of an upwelling mantle plume directly underneath Hainan Island. This implies that Hainan Island is tectonically closely related to the Red River Fault, not the South China Block. (4) In Borneo, the observed NE-SW direction is parallel to the Palawan Trench, consistent with flow associated with the inactive proto-South China Sea subduction system. The SKS splitting observations surrounding South China Sea cannot be explained by a single geologic process, with either the collision-driven extrusion model or the slab pull model fitting the data presented here.
Starting Page	407
Ending Page	429
Page Count	23
File Format	PDF
ISSN	00253235
Journal	Marine Geophysical Researches
Volume Number	34
Issue Number	3-4
e-ISSN	15730581
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-09-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	South China Sea SKS splitting Spectrum analysis Cluster analysis Oceanography Geophysics/Geodesy Earth Sciences Offshore Engineering
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics Oceanography

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