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d fo The Mw = 6.8 Chengkung earthquake on December 10, 2003 in eastern Taiwan was associated with abundant aftershocks. To The Chengkung earthquake (Mw = 6.8) occurred on shocks occurred, including 11 MLP 5.0 events that took The Longitudinal Valley (LV) of eastern Taiwan and Central Range faults. The southern segment of the Coastal Range fault (e.g., Chihshang fault) is the seismo-genic fault of 1951 Taitung earthquake (Hsu, 1962). Based on the patterns of surface rupture, this fault is segmented and has nearly equal components of vertical and horizontal slip. In order to understand the mechanism and geometr