Significant resistivity changes in the fault zone associated with the 1999 Chi-Chi earthquake, west-central Taiwan

Yang, Chia‐Ning; Cheng, Ping-Hu; You, Jiunn-I; Tsai, Lung Chih

doi:10.1016/s0040-1951(02)00146-4

Cited by 21 publications

(20 citation statements)

References 12 publications

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“…By using nondestructive geophysical investigation techniques, such as the two-dimensional (2D) electrical resistivity imaging (ERI) method, we can quantify the magnitude and variability of sediment covering bedrock faster, cheaper, and over a broader area than drilling a well or digging a trench (Hauck et al, 2003;Crook et al, 2008). The 2D ERI method has been a powerful technique to investigate shallow subsurface electrical structures in various environments (Cheng, 2000;Yang et al, 2002;Hauck et al, 2003;Sass, 2007;Cheng et al, 2008;Crook et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Bedrock detection using 2D electrical resistivity imaging along the Peikang River, central Taiwan

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Bedrock detection using 2D electrical resistivity imaging along the Peikang River, central Taiwan

et al. 2010

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“…Good examples can be seen in Verma (1979), Honkura et al (1985), Uri Basson et.al. (1994), Cai et al (1996), Yang and Hung (1996), Unsworth et al (1999) and Yang et al (2002). With proper field design and data processing, the results yield a wealth of information about the nature of a fault (Yang et al 2002).…”

Section: Introductionmentioning

confidence: 99%

“…(1994), Cai et al (1996), Yang and Hung (1996), Unsworth et al (1999) and Yang et al (2002). With proper field design and data processing, the results yield a wealth of information about the nature of a fault (Yang et al 2002). In addition to site-specific assessment, detailed mapping of active fault zones around a site is also of utmost importance for regional earthquake risk analysis.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to site-specific assessment, detailed mapping of active fault zones around a site is also of utmost importance for regional earthquake risk analysis. However, due to the fact that each geoelectrical method has different sounding depth and structural resolution power, joint or multiple interpretation of geoelectrical data may render better subsurface features than a single geoelectric method can perform (Tong and Yang 1990;Yang, et. al.…”

Section: Introductionmentioning

confidence: 99%

“…The newly developed automatic multi-electrodes (AME) system has been used successfully in resistivity image profiling (RIP) surveys on both land and water surfaces (Griffiths and Barker 1993;Yang and You 2002). RIP is a surveying technique developed to elucidate complex subsurface structures.…”

Section: Introductionmentioning

confidence: 99%

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Verification of the Suspected Ta-chia-tung Fault by Ground Penetrating Radar and Resistivity Image Profiling Methods

Yang¹,

Yu²,

Guo³

et al. 2005

Terr. Atmos. Ocean. Sci.

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Ground penetration radar imaging reveals a prominent reflector which is offset vertically by about 2.6 m at depth about 2.3 m across the scarp. Schlumberger depth sounding exhibits a disrupted marker that links the loci of maximum apparent resistivity at greater depths.Resistivity image profiling (RIP) surveys across the scarp yield either zones of low resistivity (two profiles) or disruption of high resistivity zones (one profile); those anomalies are suggestive of a low angle thrust fault.

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Low resistivity and permeability in actively deforming shear zones on the San Andreas Fault at SAFOD

2015

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The San Andreas Fault Observatory at Depth (SAFOD) scientific drill hole near Parkfield, California, crosses the San Andreas Fault at a depth of 2.7 km. Downhole measurements and analysis of core retrieved from Phase 3 drilling reveal two narrow, actively deforming zones of smectite‐clay gouge within a roughly 200 m wide fault damage zone of sandstones, siltstones, and mudstones. Here we report electrical resistivity and permeability measurements on core samples from all of these structural units at effective confining pressures up to 120 MPa. Electrical resistivity (~10 Ω‐m) and permeability (10−21 to 10−22 m2) in the actively deforming zones were 1 to 2 orders of magnitude lower than the surrounding damage zone material, consistent with broader‐scale observations from the downhole resistivity and seismic velocity logs. The higher porosity of the clay gouge, 2 to 8 times greater than that in the damage zone rocks, along with surface conduction were the principal factors contributing to the observed low resistivities. The high percentage of fine‐grained clay in the deforming zones also greatly reduced permeability to values low enough to create a barrier to fluid flow across the fault. Together, resistivity and permeability data can be used to assess the hydrogeologic characteristics of the fault, key to understanding fault structure and strength. The low resistivities and strength measurements of the SAFOD core are consistent with observations of low resistivity clays that are often found in the principal slip zones of other active faults making resistivity logs a valuable tool for identifying these zones.

show abstract

Significant resistivity changes in the fault zone associated with the 1999 Chi-Chi earthquake, west-central Taiwan

Cited by 21 publications

References 12 publications

Bedrock detection using 2D electrical resistivity imaging along the Peikang River, central Taiwan

Bedrock detection using 2D electrical resistivity imaging along the Peikang River, central Taiwan

Verification of the Suspected Ta-chia-tung Fault by Ground Penetrating Radar and Resistivity Image Profiling Methods

Low resistivity and permeability in actively deforming shear zones on the San Andreas Fault at SAFOD

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