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| Titel |
Seismic anisotropy in the southeastern China and its tectonic implications from shear wave splitting measurements |
| VerfasserIn |
Hsiao-Chuan Peng, Hao Kuo-Chen, Qiusheng Li, Francis Wu, Yu-Ping Lin, Li Zhao, Yao-Wen Kuo |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250105425
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| Publikation (Nr.) |
 EGU/EGU2015-4946.pdf |
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| Zusammenfassung |
| The tectonics of southeastern China and its surrounding regions are very complex, which
involve two active subduction systems (the Manila and Ryukyu subductions) and one
collision system (the Taiwan orogen). In this study, we use SKS/SKKS splitting as a tool for
investigating seismic anisotropy and the results of the splitting parameters, fast-polarization
azimuth (φ) and delay time (δt), will provide us a new understanding of the geodynamic
process in this region. Measurements of δt and φ can be used as indicators for the information
of the product of deformed layer thickness and strain directions. Teleseismic events recorded
in the temporary seismic network in Fujian (16 stations) are used to obtain the splitting
parameters from shear wave. Two methods (minimum energy and splitting intensity) are
applied to obtain the splitting parameters for testing the reliability of the results. As a
result, the average delay time is 2.4 s, and the fast directions can be divided in three
parts from north to south along the Fujian coastline. The predominant polarizations
in the northern part are in the E-W and NNW-SSE directions. In the middle part,
the predominant polarizations are NNE-SSW direction, which are parallel to the
Fujian coastline. In contrast, the predominant polarizations in the southern part
are NW-SE directions, which are perpendicular to the coastline. The variations of
fast-polarizations could relate to the mantle flow from western China, influenced
by the Taiwan orogen (the collision between Eurasian and Philippine sea plates). |
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