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http://dx.doi.org/10.5467/JKESS.2014.35.2.131

Seafloor Morphology and Surface Sediment Distribution of the Southwestern Part of the Ulleung Basin, East Sea  

Koo, Bon-Young (Department of Geology and Earth Environmental Sciences, Chungnam National University)
Kim, Seong-Pil (Department of Petroleum and Marine Research, Korea Institute of Geoscience and Mineral Resources)
Lee, Gwang-Soo (Department of Petroleum and Marine Research, Korea Institute of Geoscience and Mineral Resources)
Chung, Gong Soo (Department of Geology and Earth Environmental Sciences, Chungnam National University)
Publication Information
Journal of the Korean earth science society / v.35, no.2, 2014 , pp. 131-146 More about this Journal
Abstract
Multi-beam echosounder data and grain size analysis data of surface sediment were acquired and analyzed in order to investigate the shelf-to-slope morphology, geological character, and their geological controlling factors in the southwestern margin of the Ulleung Basin. According to the morphological character, the continental shelf can be divided into two parts: (1) shallow (~100 m) and steep ($0.5^{\circ}$) inner shelf, (2) deep (100-300 m) and gentle ($0.2^{\circ}$) outer shelf. The continental slope is featured with eight distinct topographic depressions of various spatial dimension (~121 $km^2$ in area) and head wall gradient (${\sim}24.3^{\circ}$). They are developed adjacent to each other and presumably formed by submarine landslides which have recurred under the strong influences of earthquakes and eustatic sea-level change. The inner continental shelf and the continental slope are dominated by fine-grained sediment, whereas the outer continental shelf is dominated by coarse-grained sediment. The surface sediment distribution seems dominantly influenced by eustatic sea-level change. The outer continental shelf is mostly covered by coarse relict sediment deposited during lowstand sea-level, while the inner shelf is covered with recent sediment during highstand sea-level. The surface of the continental slope is covered with fine-grained sediments which were supplied by hemipelagic advection process.
Keywords
morphology of submarine landslide; surface sediment distribution; geological controlling factor; Ulleung Basin; East Sea;
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Times Cited By KSCI : 4  (Citation Analysis)
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