Fault Zone Resistivity Structure and Monitoring at the Taiwan Chelungpu Drilling Project (TCDP)
- Resource Type
- article
- Authors
- Chih-Wen Chiang; Martyn J. Unsworth; Chow-Son Chen; Chien-Chih Chen; Andrew Tien-Shun Lin; Han-Lun Hsu
- Source
- Terrestrial, Atmospheric and Oceanic Sciences, Vol 19, Iss 5, p 473 (2008)
- Subject
- Audio-magnetotelluric
TCDP
Chelungpu fault
Resistivity structure
Geo-electrical strike
Time variations
Geology
QE1-996.5
Geophysics. Cosmic physics
QC801-809
- Language
- English
- ISSN
- 1017-0839
2311-7680
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.