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

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

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3619k&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 19, p. 3619-3622

Mathematics

Logic

24

Seismology: Earthquake Parameters, Seismology: Seismicity And Seismotectonics, Seismology: Instruments And Techniques

Scientific paper

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.

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