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Microseismicity Induced by Heavy Rainfall Around Flooded Vertical Ore Veins |
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| Authors: | H Ogasawara K Fujimori N Koizumi N Hirano S Fujiwara S Otsuka S Nakao K Nishigami K Taniguchi Y Iio R Nishida K Oike Y Tanaka |
| Institution: | Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Noji Higashi, Kusatsu, 525-8577, Japan. E-mail: ogasawar@se.ritsumei.ac.jp, JP Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan., JP Geological Survey of Japan, 1-1-3, Higashi, Tsukuba, Ibraki, 305-8567, Japan., JP Research Center of Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, 611-0011, Japan., JP Geographical Survey Institute, 1 Kitasato, Tsukuba, 305-0811, Japan., JP Faculty of Humanities and Sciences, Kobe Gakuin University, 518 Arise, Ikawadani-cho, Nishi-ku, Kobe, 651-2180, Japan., JP Research Center for Disaster Reduction Systems, Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan., JP Kyoto University of Education, 1 Fukakusa-Fujinomori-cho, Fushimi-ku, Kyoto, 612-8522, Japan., JP Earthquake Research Institute, the University of Tokyo, 1-1-1 Yayoi Bunkyo Tokyo 113-0032, Japan., JP Department of Civil Engineering, Faulty of Engineering, Tottori University, 4-101, Koyama-Minami, Tottori, 680-8552, Japan., JP |
| Abstract: | —?Microseismicity (M?M?M?M??6 were also monitored at a crustal movement monitoring station located several hundred meters from the veins. It was found that the opening of the vertical ore veins primary led to significant strain and tilt, but not to seismicity, because the delay and the longer duration of the seismicity were significant. Most seismic events involve thrusting mechanisms that are consistent with the present stress state of E-W-oriented tectonic compression, but are not consistent with the opening of the deepest ore vein. Interstingly, all the events within a few months of the heavy rainfall occurred near the faults that offset the deepest ore veins, wheareas all those events located away from the deepest ore veins occurred many months after the heavy rainfall. Consequently, the delayed diffusion of water appears to have played a dominant role in reducing rock strength, which led to seismicity in the Ikuno mine. |
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