Abstract
Geoelectric surveys are made in areas of probable seismic segment boundaries along the Yangsan fault zone (between 36.2°N and 35.5°N) in order to investigate resistivity structure. These segment boundaries are proposed on the basis of reduced seismicity recorded in historical earthquake data. Wenner horizontal profilings reveal resistivity of about 300 ohm-m with electrode separation of 30 m, which compares with that of 100 ohm-m in other parts of the Yangsan fault zone. Schlumberger vertical soundings indicate that the fault fracture zone diminishes in depth from about 100 m (north) to 20 m (south). Previous vertical soundings in other parts of the Yangsan fault zone show that the fault fracture zone extends to a depth greater than 100 m. Electrical profilings and soundings appear to indicate poor development of fault fractures in the study area. Geoelectrical surveys support the existence of boundaries between the northern and the central segments as well as between the central and the southern seismic segments in the Yangsan fault zone.
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References
Aki, K., 1984, Asperites, barriers, characteristic earthquakes, and strong motion prediction. Journal of Geophysical Research, 89, 5867–5872.
Allen, C.R., 1968, The tectonic environments of seismically active and inactive areas along the San Andreas fault system. Conference on Geologic Problems of the San Andreas Fault System (Proceeding), Geological Science (Stanford University), 11, 70–82.
dePolo, C.M., Clark, D.G., Slemmons, D. and Ramelli, A.R., 1991, Historical surface faulting in the basin and range province, western north America: implications for the fault segmentation. Journal of Structural Geology, 3, 123–136.
Kang, P.J., 1984, A Study on Remote Sensing Application for the Tectonic Framework of the Korean Peninsula. Ph.D. thesis, Korea University, Seoul, 110 p.
Kim, I.S. and Kim, J.Y., 1983, Electrical resistivity survey in the Eon-Yang fault area, southeastern Korean Peninsula. Journal of Korean Institute of Mining Geology, 16, 11–18.
Kim, Y. and Lee, K., 1987, A study on the structure of the Yangsan Fault in the southern part of Kyeongju. Journal of Korean Institute of Mining Geology, 20, 247–260.
Kim, Y. and Lee, K., 1988, A geoelectric study on the structure of the Yangsan Fault in the south of Kyeongju. Journal of the Geological Society of Korea, 24, 47–61.
Kim, Y., Lee, K. and Seong, I.K., 1990, A geoelectric study on the structure of the Yangsan Fault, north of Kyeongju. Journal of the Geological Society of Korea, 26, 393–403.
Lee, K. and Na, S.H., 1983, A study of microearthquake activity of the Yangsan Fault. Journal of the Geological Society of Korea, 21, 227–240.
Lee, K. and Jin, Y.G., 1991, Segmentation of the Yangsan fault system: geophysical studies on major faults in the Kyeongsang basin. Journal of the Geological Society of Korea, 27, 434–449.
Lee, K. and Um, C.R., 1992, Geoelectric survey of the Ulsan fault: geophysical studies on major faults in the Kyeongsang basin. Journal of the Geological Society of Korea, 28, 32–39.
Lee, K. and Lee, J., 1993, Segmentation of the boundary between the Ogcheon Belt and Ryeongnam Massif: geophysical studies on major faults in the Ogcheon Belt. Journal of the Geological Society of Korea, 29, 576–584.
Lee, K. and Lee, J., 1995, Segmentation of the Chugaryeong fault set: geophysical studies on major faults in the Kyeonggi Massif. Journal of the Geological Society of Korea, 31, 116–124.
Lee, Y.J. and Lee, I.K., 1972, Explanatory Text of the Geological Map of Eon Yang Sheet (1∶50,000). Geological Survey of Korea, Seoul, 22 p.
Mogi, T., Katsura, I. and Nishimura, S., 1991, Magnetotelluric survey of an active fault system in the northern part of Kinki District, southwest Japan. Journal of Structural Geology, 13, 235–240.
Oh, I.S. and Jeong, G.S., 1975, Explanatory Text of the Geological Map of Gi-Gae Sheet (1∶50,000). Geological and Mineral Institute of Korea, Seoul, 25 p.
Okada, A., Watanabe, M., Sato, H., Jun, M.S., Jo, W.R., Kim, S. K. and Oike, K., 1993, Active fault topography and trench survey at the central part of the Yangsan fault, southeast Korea. Joint Conference of Seismology in East Asia (Proceeding), Seismological Society of Japan, Tottori, Oct. 29–Nov. 2, p. 64–65.
Olorunfemi, M.O., Olarewaju, V.O. and Avci, M., 1986, Geophysical investigation of a fault zone—case history from Ilelfe, southwest Nigeria. Geophysical Prospecting, 34, 1277–1284.
Schwartz, D.P. and Coppersmith, K.J., 1984, Fault behavior and characteristic earthquakes from the Wasatch and San Andreas faults. Journal of Geophysical Research, 89, 5681–5698.
Verma, R.K. and Bandyopadhyay, T.K., 1983, Use of the resistivity method in geological mapping—case histories from Raniganj Coalfield, India. Geophysical Prospecting, 31, 490–507.
Verma, R.K., Bhuin, N.C. and Rao, C.V., 1980, Use of electrical resistivity methods for study of some faults in the Jharia Coal-field, India. Geoexploration, 18, 201–220.
Ward, S.H., 1990, Resistivity and induced polarization methods. In: Ward, S.H. (ed.), Geotechnical and Environmental Geophysics. Vol. 1. Review and Tutorial. Society of Exploration Geophysicists, Special Publication, 5, 147–189.
Zohdy, A.A.R., 1989, A new method for the automatic interpretaion of Schlumberger and Wenner sounding curves. Geophysics, 54, 245–253.
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Lee, K., Lee, J. Geoelectric study on the probable seismic segment boundaries of Yangsan fault zone. Geosci J 1, 16–25 (1997). https://doi.org/10.1007/BF02910446
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DOI: https://doi.org/10.1007/BF02910446