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Electrokinetic phenomena associated with a water injection experiment at the Nojima fault on Awaji Island, Japan |
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| Authors: | Hideki Murakami Takeshi Hashimoto Naoto Oshiman Satoru Yamaguchi Yoshimori Honkura Norihiko Sumitomo |
| Institution: | Department of Natural Environmental Science, Faculty of Science, Kochi University, Akebono-cho, Kochi 780-8520, Japan (email:;),Aso Volcanological Laboratory, Faculty of Science, Kyoto University, Aso, Kumamoto 869-1400, Japan,;Disaster Prevention Research Institute, Kyoto University, Gokasyo, Uji 616-0011, Japan,;Department of Earth and Planetary Sciences, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan, and;Department of Earth and Planetary Sciences, Faculty of Science, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan |
| Abstract: | Abstract Self-potential variations were measured to estimate the magnitude of electrokinetic and hydrological parameters (zeta potential and permeability) of the Nojima Fault zone in Awaji, Japan. The study observed self-potential variations that seemed to be associated with water flow from the injection well to the fracture zone, which were induced by turning the injection on and off. Amplitudes of the variations were a few to 0.03 V across 320–450 m dipoles. These variations can be explained well with an electrokinetic model. The quantity k/ζ (permeability/zeta potential) is in the range 1.6 × 10 |
| Keywords: | 1995 Hyogo-ken Nanbu earthquake electrokinetic phenomena Nojima Fault Zone Probe streaming potential water injection experiment |