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http://dx.doi.org/10.9719/EEG.2017.50.2.129

Slope Stability and Development of Debris Flow Deposit in the Ulleung Basin, East Sea  

Lee, Sun-Jong (Department of Oceanography and Ocean Environmental Sciences, Chungnam National University)
Lee, Jeong-Min (Korea Seabed Information (KOSBI) Corporation)
Yoo, Dong-Geun (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Lee, Go-Eun (Department of Oceanography and Ocean Environmental Sciences, Chungnam National University)
Park, Soo-Chul (Department of Oceanography and Ocean Environmental Sciences, Chungnam National University)
Publication Information
Economic and Environmental Geology / v.50, no.2, 2017 , pp. 129-143 More about this Journal
Abstract
The shallow sediments in the southwestern Ulleung Basin consist of mass flow deposits such as slide/slump and debris flow deposits (DFD), caused by slope failure. These sediments are proven to be important in studying geological disaster and stability of the seafloor. In this paper, we analysised the flow accumulation and slope failure susceptibility of the Ulleung Basin on the basis of multi-beam data, collected in this area. We also studied the distribution pattern and the seismic characteristics of the DFD in the uppermost layer of the Ulleung Basin on the basis of seismic data. The slope susceptibility was calculated as the frequency ratio of each factors including slope, aspect, curvature and stream power index (SPI), which causes the slope failure. These results indicate that the slope failure is frequently to occur in the southern and western continental slope of the Ulleung Basin. The sediment flow (mass flow) caused by the slope failure converges to the north and northwest of the Ulleung Basin. According to the seismic characteristics, the uppermost layer in study area can be divided into four sedimentary unit. These sedimentary units develop from the south and southwest to the north and northwest in association with slope susceptibility and flow accumulation.
Keywords
Ulleung Basin; flow accumulation; slope failure susceptibility; debris flow deposits; seismic characteristics;
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Times Cited By KSCI : 8  (Citation Analysis)
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