Quaternary reactivation of Tertiary faults in the southeastern Korean Peninsula: Age constraint by optically stimulated luminescence dating |
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| Authors: | Jin-Han Ree Young-Joon Lee Ed J Rhodes Youngdo Park Sung-Tack Kwon Ueechan Chwae Jeong-Soo Jeon Bongjoo Lee |
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| Institution: | ;Department of Earth and Environmental Sciences, Korea University, Seoul 136-701, South Korea (email: ), Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford OX1 3QJ, UK,; Department of Earth System Sciences, Yonsei University, Seoul 120-749, South Korea and; Korea Institute of Geoscience and Mineral Resources, Taejon 305-350, South Korea |
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| Abstract: | Abstract Two groups of Quaternary faults occur in the southeastern Korean Peninsula. The first group is north-northeast-striking, high-angle dextral strike–slip faults. The second group is north-northeast-striking, low-angle reverse faults that represent the reactivation of the pre-existing normal faults. Optically stimulated luminescence dating of Quaternary sediments cut by one of the reverse faults constrains the faulting age to post-32 Ka. These faults seem to be capable of further slip under the current tectonic stress regime, as determined by recent earthquake events in northeast Asia. Therefore, the traditional concept that the southeastern Korean Peninsula is seismically stable should be reappraised. |
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| Keywords: | optically stimulated luminescence dating Quaternary faults reactivation southeastern Korean Peninsula stress regime |
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