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Title: Fault zone resistivity structure and monitoring at the Taiwan Chelungpu drilling Project (TCDP)
Authors: Chih-Wen Chiang
Martyn J. Unsworth
Chow-Son Chen
Chien-Chih Chen
Andrew Tien-Shun Lin
Han-Lun Hsu
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: Audio-magnetotelluric
Chelungpu fault
Resistivity structure
Geo-electrical strike
Time variations
Date: 2008-10
Issue Date: 2017-02-06T03:31:20Z
Publisher: Terrestrial, Atmospheric and Oceanic Sciences
Abstract: Abstract: The Taiwan Chelungpu-fault drilling project (TCDP) has undertaken scientific drilling and directly sampled the sub-surface rupture of the 1999 Chi-Chi earthquake. Audio-magnetotelluric (AMT) measurements were used to investigate electrical resistivity structure at the TCDP site from 2004 - 2006. These data show a geoelectric strike direction of N15 E to N30 E. Inversion and forward modeling of the AMT data were used to generate a 1-D resistivity model that has a prominent low resistivity zone (< 10 ohm-m) between depths of 1100 and 1500 m. When combined with porosity measurements, theAMT measurements imply that the ground water has a resistivity of 0.55 ohm-m at the depth of the fault zone.
Time variations in the measured AMT data were observed from 2004 - 2005 with maximum changes of 43% in apparent resistivity and 18 in phase. The change in apparent resistivity is greatest in the 1000 - 100 Hz frequency band. These frequencies are sensitive to the resistivity structure of the upper 500 m of the hanging wall of the Chelungpu Fault. The decrease in resistivity over time appears to be robust and could be caused by an increase in porosity and a re-distribution of the groundwater.
Relation: 19(5)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40673
Appears in Collections:[應用地球科學研究所] 期刊論文

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