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GEOPHYSICAL RESEARCH LETTERS,
VOL. 28, NO. 23,
PP. 4379-4382, 2001
doi:10.1029/2001GL013225
Slip distribution and tectonic implication of the 1999 Chi‐Chi, Taiwan, Earthquake
Seismological Laboratory, California Institute of Technology, Pasadena
Seismological Laboratory, California Institute of Technology, Pasadena
Seismological Laboratory, California Institute of Technology, Pasadena
Institute of Geophysics, National Central University, Chung‐Li, Taiwan
U.S. Geological Survey, Pasadena
We report on the fault complexity of the large (M w = 7.6) Chi‐Chi earthquake obtained by inverting densely and well‐distributed static measurements consisting of 119 GPS and 23 doubly integrated strong motion records. We show that the slip of the Chi‐Chi earthquake was concentrated on the surface of a ”wedge shaped” block. The inferred geometric complexity explains the difference between the strike of the fault plane determined by long period seismic data and surface break observations. When combined with other geophysical and geological observations, the result provides a unique snapshot of tectonic deformation taking place in the form of very large (>10m) displacements of a massive wedge‐shaped crustal block which may relate to the changeover from over‐thrusting to subducting motion between the Philippine Sea and the Eurasian plates.
Received 26 March 2001; accepted 5 September 2001; .
Citation: (2001), Slip distribution and tectonic implication of the 1999 Chi‐Chi, Taiwan, Earthquake, Geophys. Res. Lett., 28(23), 4379–4382, doi:10.1029/2001GL013225.
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