Moment-tensor inversion for offshore earthquakes east of Taiwan and their implications to regional collision

Honn Kao, Pei Ru Jian, Kuo Fong Ma, Bor Shouh Huang, Chun Chi Liu

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

Reliable determination of source parameters for offshore earthquakes east of Taiwan with mb<5.5 was a difficult task because of the poor azimuthal coverage by local network and the lack of signals at teleseismic distances. We take advantage of the recently established `Broadband Array in Taiwan for Seismology' (BATS) to invert seismic moment tensors for 7 such events occurred in 1996. To cope with different patterns of background noise and unknown structural details, we utilize variable frequency bands in the inversion and adapt a two-step procedure to select best velocity models for individual epicenter-station paths. Our results are consistent with the overall patterns of regional collision and indicate that the resulting compressive stress has caused significant intraplate deformation within the Philippine Sea plate. Simulation of the region's geological evolution and orogenic processes should take this factor into account and allow the Philippine Sea plate to deform internally.

Original languageEnglish
Pages (from-to)3619-3622
Number of pages4
JournalGeophysical Research Letters
Volume25
Issue number19
DOIs
StatePublished - 1 Oct 1998

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