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Geophysical Responses of the Yangsan Fault Zone at Eonyang Area  

Kwon Byung-Doo (Department of Earth Science Education, Seoul National University)
Lee Heuisoon (Department of Science Education, GyeongIn National University of Education)
Lee Choon-Ki (Department of Earth Science Education, Seoul National University)
Park Gyesoon (Department of Earth Science Education, Seoul National University)
Oh Seokhoon (Korea Institute of Water and Environment (KWE), KOWACO)
Lee Duk Kee (Marine Meteorology & Earthquake Res. Lab., METRI)
Publication Information
Journal of the Korean earth science society / v.26, no.5, 2005 , pp. 436-442 More about this Journal
Abstract
We have performed multiple geophysical surveys comprised of gravity, magnetic and resistivity methods at the Yangsan fault zone which runs through the Eonyang area, the eastern part of Kyeongsang in southeast Korea. The gravity and magnetic data provide information about geological structures. Furthermore, sections of electrical resistivity show the sharp contrast of electrical resistivity distribution across the fault zone. Since the fractured zone tends to be more conductive than fresh host rocks, the electrical resistivity survey is effective in determining the detailed structure of the fault zone. We have made gravity measurements at a total of 71 points alongside two profiles across the fault zone, and carried out an electrical resistivity survey with a dipole-dipole array at the same location using 40m dipole length. In addition, we have analyzed the aeromagnetic data on the corresponding area. The multiple geophysical properties appear to be abruptly changed in electrical resistivity, gravity and aeromagneticclearly show the different appearance across the fault zone. The fault is identified by its sub vertical attitude which is well known in the Yangsan fault zone. We have also confirmed that the magnitude of the response of the fault is much larger in the southern part of the survey area than the northern area. These results most likely to provide basic information for the further studies about the physical properties and the structures at the Yangsan fault.
Keywords
Yangsan fault; Gravity; Aeromagnetic; Resistivity;
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