Abstract
No abstract available. doi:10.2204/iodp.sd.s01.27.2007
Highlights
The 1999 Chi-Chi earthquake (Mw7.6) produced a > 9 0 -k m - l o n g s u r f a c e r u p t u r e z o n e a lo n g th e n o r t h -s o u th trending, west-vergent Chelungpu fault
Wellbore failure: In situ stresses SHmax determined from borehole breakouts and drilling-induced tensile fractures from Hole A and Hole B (Fig. 4) show that a significant change of SHmax azimuth occurs across the depth of 1300 m
The major scientific goal of the Taiwan Chelungpu-Fault Drilling Project (TCDP) boreholes is to understand the physical mechanism involved in the large displacement during the Chi-Chi earthquake
Summary
The 1999 Chi-Chi earthquake (Mw7.6) produced a > 9 0 -k m - l o n g s u r f a c e r u p t u r e z o n e a lo n g th e n o r t h -s o u th trending, west-vergent Chelungpu fault. To address the above questions two holes (A and B) w e r e d r i l le d fo r t h e T a i w a n Chelungpu Fault Drilling Project (TCDP) during 2004–2005 at Dakeng, west-central Taiwan, where large surface slip (~10 m) was observed. Data from the drilled holes provide a unique opportunity to understand deformation mechanisms and physical properties of the Chelungpu fault where large slip occurred in the Chi-Chi earthquake.
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