Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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A Geoacoustic Model at the YMGR-102 Long-core Site in the Middle of the Yellow Sea

  • Ryang, Woo-Hun (Division of Science Education and Institute of Science Education, Jeonbuk National University) ;
  • Kim, Seong-Pil (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources)
  • Received : 2022.08.02
  • Accepted : 2022.08.19
  • Published : 2022.08.31
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Abstract

The Yellow Sea experienced glacio-eustasy sea-level fluctuations during the Quaternary period. In the middle part of the Yellow Sea, the Quaternary successions were accumulated by alternating terrestrial, paralic, and shallow marine deposits that reflected the fluctuating sea levels. A long core of 69.2 m was acquired at the YMGR-102 site (33°50.1782'N and 123°48.3019'E) at a depth of 72.5 m in the middle of the Yellow Sea. A four-layered geoacoustic model was reconstructed for the sedimentary succession. It was based on seismic characteristics from 3.5 kHz SBP and air-gun seismic profiles and 96 grain-size properties in the core sample from YMGR-102. For the underwater simulation and experiments, the in-situ P-wave speeds were calculated using the sound speed ratio of the Hamilton method. The geoacoustic model of YMGR-102 can contribute to the reconstruction of geoacoustic models, reflecting the vertical and lateral variability of the acoustic properties in the continental shelf of the middle Yellow Sea.

Keywords

Acknowledgement

The original data of marine geophysics and geology were acquired from the Yellow Sea science program: Study on the marine geology and mineral resources in the Yellow Sea (KIGAM 2000-N-LO-01-A-03). We are grateful to anonymous reviewers for their critical and helpful comments. WHR thanks Ms. Kang, Sol-Ip (Jeonbuk National University) for working the computer graphics. This research was supported by research funds of Jeonbuk National University (2022. 3.-2024. 2.) and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2022R1F1A1063126). SPK was supported by the project of development of the integrated geophysical survey and real-scale data processing technologies for 3D high-resolution imaging of the marine subsurface (GP2020-023) of KIGAM.

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