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Characteristics of Pockmark Topography in Hupo Basin, East Sea
동해 후포분지의 Pockmark 해저지형 특성 연구
Econ. Environ. Geol. 2019 Dec;52(6):561-71
Published online December 31, 2019;  https://doi.org/10.9719/EEG.2019.52.6.561
Copyright © 2019 the Korean society of economic and environmental gelology.

ChangHwan Kim*, ChanHong Park, MyoungHoon Lee, SoonYoung Choi and WonHyuck Kim
김창환* · 박찬홍 · 이명훈 · 최순영 · 김원혁

Korea Institute of Ocean Science & Technology, East Sea Research Institute
한국해양과학기술원 동해연구소
Received October 30, 2019; Accepted December 18, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
The Hupo Basin, continental marginal basin, of the East Sea extends to Uljin-gun and Yeongdeok-gun. The Hupo Bank, a terrain that is higher than the surrounding seabed, is located at the eastern boundary of the Hupo Basin. KIOST(Korea Institute of Ocean Science and Technology) conducted detailed bathymetry surveys in the northern, central and southern areas of the Hupo Basin from 2011 to 2013. The Hupo Basin, bounded by steep slopes of the Hupo Bank, is deepened from the west coast to the east and deepest to a maximum depth of about 250 m. A narrow seafloor channel appears in the northern, central, and southern areas with the deepest depths. Numerous pockmarks appear on the seafloor at depths of about 150 ~ 250 m in all the three areas of the detailed bathymetry surveys. These pockmarks generally have diameters of about 20 to 50 m and depths of about 4 to 6 m, with craterlike submarine topography of various sizes. Seafloor sediments in the pockmark areas consist of fine silt. Comparing the shape and size of the pockmark of the Hupo Basin with that of other regions of the world, it is considered to be classified as a normal pockmark. There are about 7 pockmarks/1 km2 in the northern part of the three areas and about 8 pockmarks/1 km2 in the central part. The southern part has about 5 pockmarks/1 km2. If the area with the possibility of pockmarks is extended to the depth area of about 150 ~ 250 m in the entire Hupo Basin, the number of pockmarks is estimated to be more than about 4800. The pockmark of the Hupo Basin is more likely to be generated by a fluid such as a liquid than a gas. But it is necessary to scrutinize the cause and continuously monitor the pockmark.
Keywords : Hupo Basin, detailed bathymetry survey, pockmark, crater-like, fluid

 

December 2019, 52 (6)