Anisotropy in the subducting slab: Observations from Philippine Sea plate events in Taiwan

Kate Huihsuan Chen, Yu Lung Tseng, Takashi Furumura, Brian L.N. Kennett

    研究成果: 雜誌貢獻期刊論文同行評審

    3 引文 斯高帕斯(Scopus)

    摘要

    In the southernmost Ryukyu subduction zone, slab-guiding behavior from intermediate-depth earthquakes is well documented with a low-frequency (<2 Hz) first P arrival followed by sustained high-frequency (3-10 Hz) wave trains. Such waves developed by propagating along a long path within the slab are expected to have high sensitivity to anisotropy within the slab. We determine shear wave splitting parameters from 178 intraplate events that are deeper than 100 km. The possible slab-anisotropy-associated polarization pattern shows the fast direction at N65°E and delay time of 0.13-0.45 s. This is stronger than the previously documented crust effect (<0.1 s), similar to the mantle wedge effect (0.28 s in average), but weaker than the upper mantle effect (1.3 s in average) in Taiwan. The fast axis reflects the fossil spreading direction of Philippine Sea plate with minor clockwise rotation due to the collision to Eurasian plate.

    原文英語
    頁(從 - 到)10248-10255
    頁數8
    期刊Geophysical Research Letters
    42
    發行號23
    DOIs
    出版狀態已發佈 - 2015 十二月 16

    ASJC Scopus subject areas

    • Geophysics
    • Earth and Planetary Sciences(all)

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