HR: 0800h
AN: S41A-0933    [Abstracts]
TI: Physical Properties of TCDP Drill Hole in Ta-keng Taiwan
AU: * Wu, H
EM: sonata@eqkc.earth.ncu.edu.tw
AU: Ma, K
EM: fong@earth.ncu.edu.tw
AU: Wang, C
EM: wangcy@cc.ncu.edu.tw
AU: Hung, J
EM: jhung@earth.ncu.edu.tw
AU: Ito, H
EM: hisao.itou@aist.gp.jp
AB: The TCDP (Taiwan Chelungpu-fault Drilling Project) project was commenced on Feb, 2004. A comprehensive suit of geophysical logs was collected in TCDP from a depth of 500m to 1300m in the Cholan and ChinShui formation. We try to analysis the shear-wave waveform and wave components propagating into the formation. For sonic measurement, anisotropy may raise from intrinsic structural effects, such as aligned fractures and layering of thin zones. These effects lead to differences in formation elastic properties. Especially fault found with anisotropy evaluation. Using observations of dipole shear sonic velocity can identify the compressive failures and tensile fracture direction. The depths containing the shear zone and compare with geophysical properties such as P and S-wave velocity, Gamma ray, density and resistively to modify shear velocity anisotropy. The direction of the maximum horizontal principal stress will be derived. The stress tensor inverted from earthquakes and regional anisotropy analysis, the physical mechanism responsible for the anisotropy observed in the borehole will be examined.
DE: 7230 Seismicity and seismotectonics
DE: 7200 SEISMOLOGY
DE: 7209 Earthquake dynamics and mechanics
SC: Seismology [S]
MN: 2004 AGU Fall Meeting