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Fault Zone Resistivity Structure and Monitoring at the Taiwan Chelungpu Drilling Project (TCDP)
並列摘要
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, the AMT 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 500m 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.
延伸閱讀
- Song, S. R., Wang, C. Y., Hung, J. H., & Ma, K. F. (2007). Preface to the Special Issue on Taiwan Chelungpu-Fault Drilling Project (TCDP): Site Characteristics and On-Site Measurements. Terrestrial, Atmospheric and Oceanic Sciences, 18(2), i-vi. https://www.airitilibrary.com/Article/Detail?DocID=10170839-200706-18-2-i-vi-a
- Hung, J. H., Wu, Y. H., Yeh, E. C., Wu, J. C., & Party, T. S. (2007). Subsurface Structure, Physical Properties, and Fault Zone Characteristics in the Scientific Drill Holes of Taiwan Chelungpu-Fault Drilling Project. Terrestrial, Atmospheric and Oceanic Sciences, 18(2), 271-293. https://www.airitilibrary.com/Article/Detail?DocID=10170839-200706-18-2-271-293-a
- Yeh, E. C., Sone, H., Nakaya, T., Ian, K. H., Song, S. R., Hung, J. H., Lin, W., Hirono, T., Wang, C. Y., Ma, K. F., Soh, W., & Kinoshita, M. (2007). Core Description and Characteristics of Fault Zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project. Terrestrial, Atmospheric and Oceanic Sciences, 18(2), 327-357. https://www.airitilibrary.com/Article/Detail?DocID=10170839-200706-18-2-327-357-a
- 李千里（2006）。Investigating geometry of the Chelungpu fault, Central Taiwan, by the Seismic Reflection Method〔博士論文，國立中央大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0031-0207200917340622
- Tanaka, H., Wang, C. Y., Chen, W. M., Sakaguchi, A., Ujiie, K., Ito, H., & Ando, M. (2002). Initial Science Report of Shallow Drilling Penetrating into the Chelungpu Fault Zone, Taiwan. Terrestrial, Atmospheric and Oceanic Sciences, 13(3), 227-251. https://www.airitilibrary.com/Article/Detail?DocID=10170839-200209-13-3-227-251-a