Determination of slip rate by optical dating of fluvial deposits from the Wangsan fault,SE Korea |
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| Institution: | 1. RISKNAT Group, GEOMODELS, Departament de Geodinàmica i Geofísica, Facultat de Geologia, Universitat de Barcelona, c/Martí i Franquès, s/n, 08028 Barcelona, Spain;2. Barcelona Center for Subsurface Imaging (B-CSI), Departament de Geociències Marines - Institut de Ciències del Mar - CSIC, 08003 Barcelona, Spain;3. Institut de Radioprotection et Sûreté Nucléaire - Seismic Hazard Division (BERSSIN), BP 17, 92262 Fontenay-aux-Roses, France;4. Área de Geodinámica Externa, Facultad de CC. Ambientales, Universidad de León, Campus de Vegazana s/n, 24071, León, Spain;5. Departamento de Geodinamica, Universidad Complutense, Instituto de Geociencias IGEO (UCM, CSIC), 28040 Madrid, Spain;6. Department of Geological Sciences, San Diego State University, San Diego, CA 92182, USA;7. Berkeley Geochronology Center, Berkeley, CA 94709, USA;8. Landscape Dynamics, Department of Geography, University of Sheffield, Sheffield S10 2TN, UK;1. Department of Earth Science and Engineering, King Abdullah University of Science and Technology, KAUST, Thuwal 23955-6900, Saudi Arabia;2. Tectonics and Mechanics of the Lithosphere, Institute de Physique du Globe de Paris, IPGP, 75252 Paris Cedex 05, France;3. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA |
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| Abstract: | The time-integrated slip rate in fault zones can be determined if the deformed deposits are reliably dated. Here, we report optically stimulated luminescence (OSL) ages of Late Pleistocene fluvial deposits cut by the Wangsan fault, southeastern Korea, which displaces a hanging wall block of about 28 m. Five sandy samples of the deformed Quaternary deposits were dated by quartz OSL using the single aliquot regenerative-dose (SAR) protocol. Three samples taken from the footwall block show stratigraphically consistent OSL ages of 54±7, 76±5 and 90±6 ka, from top to bottom. Two samples collected from the same layer in the hanging wall block show reproducible OSL ages of 81±5 and 82±5 ka, which are also in good agreement with the stratigraphic relationships. Our OSL ages yield an average sedimentation rate of the Quaternary deposits as around 0.04 mm a?1, and a minimum value of time-integrated slip rate as 0.52 mm a?1. This minimum slip rate is considerably higher than those reported earlier for Quaternary faults in southeastern Korea. The youngest OSL age (54±7 ka) constrains the maximum value of the recurrence interval of the fault movement. |
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