Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Characteristics of Pockmark Topography in Hupo Basin, East Sea

동해 후포분지의 Pockmark 해저지형 특성 연구

  • Kim, ChangHwan (Korea Institute of Ocean Science & Technology, East Sea Research Institute) ;
  • Park, ChanHong (Korea Institute of Ocean Science & Technology, East Sea Research Institute) ;
  • Lee, MyoungHoon (Korea Institute of Ocean Science & Technology, East Sea Research Institute) ;
  • Choi, SoonYoung (Korea Institute of Ocean Science & Technology, East Sea Research Institute) ;
  • Kim, WonHyuck (Korea Institute of Ocean Science & Technology, East Sea Research Institute)
  • 김창환 (한국해양과학기술원 동해연구소) ;
  • 박찬홍 (한국해양과학기술원 동해연구소) ;
  • 이명훈 (한국해양과학기술원 동해연구소) ;
  • 최순영 (한국해양과학기술원 동해연구소) ;
  • 김원혁 (한국해양과학기술원 동해연구소)
  • Received : 2019.10.30
  • Accepted : 2019.12.18
  • Published : 2019.12.28
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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 ㎢ in the northern part of the three areas and about 8 pockmarks/1 ㎢ in the central part. The southern part has about 5 pockmarks/1 ㎢. 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.

동해 후포분지는 동해안의 울진군과 영덕군에 걸쳐 있는 대륙주변부의 분지이고 후포분지 동쪽 경계부에는 주변 해저지형보다 높은 지형인 후포퇴(Hupo Bank)가 위치하고 있다. 한국해양과학기술원에서는 2011년부터 2013년까지 후포분지 북부해역, 왕돌초가 위치한 중부해역과 남부해역의 세 지역에 대하여 정밀 해저지형 조사를 실시하였다. 이 후포분지는 서쪽 연안부터 동쪽으로 가면서 점점 깊어져 최대 수심은 약 250 m에 이르며 후포퇴 급경사면을 만나면서 분지경계가 나타난다. 후포분지의 북부, 중부, 남부 세지역 모두에서 좁은 수로가 나타나며 그 수로에서 가장 깊은 수심대를 보인다. 후포분지 정밀 해저지형 자료에서 약 150 ~ 250 m 수심의 범위 해저에 수많은 pockmark들이 나타나고 있다. 이 pockmark들은 전반적으로 지름이 약 20 ~ 50 m이고 그 깊이는 약 4 ~ 6 m로 다양한 크기의 원형 화구형태(crater-like)의 해저지형구조를 보인다. Pockmark 지역의 표층 퇴적물은 세립한 실트로 구성되어 있다. 후포분지 pockmark의 형태와 크기를 해외 다른 지역들의 pockmark와 비교해보면 정상(normal) pockmark로 분류되는 것으로 판단된다. 후포분지 북쪽지역은 pockmark가 약 7개/1 ㎢ 있으며, 중앙부는 pockmark가 약 8개/1 ㎢ 나타난다. 남쪽의 조사구역은 pockmark가 약 5개/1 ㎢ 분포하는 것으로 파악된다. Pockmark 존재 가능성이 있는 구역을 후포분지 전체 약 150 ~ 250 m 수심지역으로 확대하면 그 pockmark 수가 약 4800개 이상일 것으로 판단된다. 후포분지의 pockmark는 가스보다는 액체와 같은 유체에 의해 생성되었을 가능성이 많은 것으로 생각되지만 생성원인에 대한 정밀 조사와 지속적인 모니터링이 필요할 것으로 판단된다.

Keywords

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