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Ground displacements around the fault of the September 20th, 1999, Chi‐Chi Taiwan Earthquake

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.