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Ground displacements around the fault of the September 20 th , 1999, Chi‐Chi Taiwan Earthquake
Author(s) -
Shin T. C.,
Wu F. T.,
Chung J. K.,
Chen R. Y.,
Wu Y. M.,
Chang C. S.,
Teng T. L.
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl011281
Subject(s) - geology , seismology , fault (geology) , geodesy , fault trace , displacement (psychology) , vertical displacement , thrust fault , ground motion , thrust , geomorphology , physics , thermodynamics , psychology , psychotherapist
Ground displacements in the meizoseismal area of the September 20, 1999, Chi‐chi earthquake are derived from accelerograms at 39 stations. On the hanging wall side a maximum horizontal, NW‐directed motion of 8 meters and a vertical rise of 3.7 meters are found near the northern end of the N‐S trending surface trace of the fault. On the footwall side and next to the fault a maximum horizontal motion of 1.3 meters and a maximum downward vertical motion of 1 meter are observed. The displacement field describes the source as a thrust fault with left‐lateral motion. The displacements increase from south to north along the fault, and so does the left‐lateral component of the fault motion, from about 10% to 60% of the total horizontal displacement. The recorded motions, especially ground velocities and accelerations, are noticeably stronger on the hanging wall side than on the footwall side.