HR: 0800h
AN: T51A-1320    [Abstracts]
TI: Correlations Among Various Physical Properties of Fault Zone Cores Retrieved From TCDP Hole-B
AU: * Lin, W
EM: lin@jamstec.go.jp
AF: Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Hirono, T
EM: hirono@jamstec.go.jp
AF: Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Yeh, E
EM: yeh@jamstec.go.jp
AF: Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Soh, W
EM: soh@jamstec.go.jp
AF: Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Ito, H
EM: hisao.itou@aist.go.jp
AF: Center for Earth Exploration (CDEX), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3173-25 Showa-machi, Kanazawa-Ku, Yokohama, 236-0001 Japan
AU: Aoike, K
EM: bluepond@jamstec.go.jp
AF: Center for Earth Exploration (CDEX), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3173-25 Showa-machi, Kanazawa-Ku, Yokohama, 236-0001 Japan
AU: Matsubayashi, O
EM: matsubayashi-osamu@aist.go.jp
AF: Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba, 305-8567 Japan
AU: Hashimoto, Y
EM: hassy@cc.kochi-u.ac.jp
AF: Kochi University, Akebonocyo 2-5-1, Kochi, 780-8520 Japan
AU: Sone, H
EM: hirokisone@kueps.kyoto-u.ac.jp
AF: Kyoto University, Sakyoku, Kyoto, 606-8502 Japan
AU: Song, S
EM: srsong@ntu.edu.tw
AF: Dept. Geosciences, National Taiwan University, P.O. Box 13-318, Taipei, 106 Taiwan
AU: Hung, J
EM: jhung@earth.ncu.edu.tw
AF: Dept. of Earth Sciences, National Central University, Zhong Da Road 320, Chung-Li, 32054 Taiwan
AB: The 1999 Chi-Chi, Taiwan earthquake (Mw7.6) produced spectacular surface faulting with vertical displacements of up to 8 m on the Chelungpu-fault. In order to solve the riddles about the mechanism of earthquake generation and the mysterious rupture propagation of the earthquake faulting, Taiwan Chelungpu-fault Drilling Project (TCDP) was undertaken. In the second drilling hole, Hole-B, core samples with the depth of 950-1350m were continuously retrieved. Almost the core of total length 400m taken from the Hole-B is being used to do various non-destroyed measurements in Kochi Institute for Core Sample Research, JAMSTEC, Japan. Measurement items include optical and X-ray CT images, Multi-Sensor Core Logger (density, magnetic susceptibility, natural gamma ray, and color reflectance spectrum), XRF core logger (major component elements), water content, thermal properties etc. In the coring depth range of the Hole-B, three fault zones were encountered at 1137m, 1194m and 1243m respectively. The fault zone at 1137m which is believed to be the most potential fault slipped during Chi-Chi earthquake in Hole-B consists of fractured zone, breccia zone, gray gouge, foliated gouge, black gouge, breccia zone and fractured zone in top-to-bottom order. The black gouge may be the portion of displacement-concentrated zone during the earthquake. We observed some abnormalities of physical properties corresponding to the fault structure. In particular, the magnetic susceptibility of the black gouge was higher than that of wall rocks, fractured zones and gray gouge. In addition, various physical and chemical parameters on fault zone cores showed obvious correlations which can be thought to be valuable to deepen the understanding of the fault rupture mechanism.
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 8010 Fractures and faults
DE: 8102 Continental contractional orogenic belts and inversion tectonics
DE: 8150 Plate boundary: general (3040)
SC: Tectonophysics [T]
MN: Fall Meeting 2005