HR: 1340h
AN: T43B-1356    [Abstracts]
TI: Deformation History And Paleoseismic Importance Of The Eupcheon Fault, SE Korea
AU: * Kim, Y
EM: ysk7909@pknu.ac.kr
AF: Pukyong National University, Dep. of Environmental Geosciences, Pukyong National University, Busan, 608-737, Korea, Republic of
AU: Kihm, J
EM: jung0209@hitel.net
AF: Seoul National University, School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Korea, Republic of
AB: The Korean Peninsula was widely regarded as being located at the relatively stable platform of the Asian continent. However, recently over 20 Quaternary faults have been discovered and reported in SE Korea. The concern on the activities of the faults is increasing, because new unclear power plants and low and medium nuclear waste disposal sites are decided to be located around this area. Especially, the Eupcheon Fault, one of the Quaternary faults, is very close to a nuclear power plant. We carried out tracing and trench surveys to know the characteristics and evolution of the fault. Our research is mainly focused on the fault contacts between Cretaceous sedimentary rocks and Tertiary volcanic rocks, and faulting events inferred from the trench sections. The fault is interpreted as a reactivated reverse fault (N20¢®¨¡E/40¢®¨¡SE) with ~ 6 m displacement. The fault may be developed as a normal fault in the Tertiary period under extensional regime, and it was repeatedly reactivated as a reverse fault at least three times during the Quaternary period under compressional regime, indicating inversion tectonics. Based on the data and interpretation, we suggested an evolution model for the area around the fault.
DE: 8010 Fractures and faults
DE: 8036 Paleoseismology (7221)
DE: 8107 Continental neotectonics (8002)
DE: 8108 Continental tectonics: compressional
DE: 8118 Dynamics and mechanics of faulting (8004)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting