Finite fault inversion of the September 25, 1999 (Mw = 6.4) Taiwan earthquake: Implications for GPS displacements of Chi-Chi, Taiwan earthquake sequence

Details Finite fault inversion of the September 25, 1999 (Mw = 6.4) Taiwan earthquake: Implications for GPS displacements of Chi-Chi, Taiwan earthquake sequence Finite fault inversion of the September 25, 1999 (Mw = 6.4) Taiwan earthquake: Implications for GPS displacements of Chi-Chi, Taiwan earthquake sequence

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n..39c&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 14, pp. 39-1, CiteID 1694, DOI 10.1029/2002GL015237

Physics

1

Geodesy And Gravity: Seismic Deformations (7205), Seismology: Earthquake Parameters, Seismology: Earthquake Ground Motions And Engineering, Seismology: Seismicity And Seismotectonics, Tectonophysics: Continental Contractional Orogenic Belts

Scientific paper

The September 25, 1999 Chi-Chi Taiwan aftershock (Mw = 6.4) occurred on a down dip extension of the fault ruptured in the mainshock. Strong motion data were used to invert for the finite-source process and test for the causative fault plane. We performed a grid-search over a range of focal mechanisms and found a preferred model (strike = 5°, dip = 30°, slip = 100°) different from teleseismic studies (strike = 28+/-10°, dip = 27+/-5°, slip = 106+/-9°) but similar to the mainshock (strike = 5°, dip = 34°, slip = 65°). The aftershock asperity has a dimension of 10 km × 10 km with a maximum slip of ~1.8 m and a static stress drop of 8 MPa. We forward-predict the GPS displacements and found up to 0.033 m of surface horizontal displacements at some GPS sites, indicating that studies of post-seismic deformation may need to account for the effects of large aftershocks.

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