Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..927o&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 7, p. 927-930
Physics
15
Geodesy And Gravity: Crustal Movements-Intraplate, Geodesy And Gravity: Crustal Movements-Interplate, Tectonophysics: Plate Motions-Present And Recent
Scientific paper
We investigate interplate coupling between the Philippine Sea and the Eurasian plates at the Nankai Trough off southwest Japan during the interseismic period. Plate coupling is modeled by imaginary backward normal slip superposed on the steady-state subduction. We divide the plate interface into several segments, and estimate coupling on each segment from GPS horizontal velocity data. Estimated coupling is in general agreement with the rate of steady-state subduction predicted from a plate motion model. This implies that current coupling at the Nankai Trough is so strong that much of the relative plate motion is taken up by shortening of the leading edge of the overriding plate. It seems that stronger interseismic coupling is realized on the segment where larger coseismic dislocation occurred, and vice versa. Time fluctuation of plate coupling from 1995 to 1996 is found on a small segment.
Miyazaki Shin'ichi
Ozawa Taku
Tabei Takao
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