Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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A Geoacoustic Model at the SSDP-101 Long-core Site in the Korea Strait

  • Woo-Hun Ryang (Division of Science Education and Institute of Science Education, Jeonbuk National University) ;
  • Seong-Pil Kim (Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources)
  • Received : 2023.08.17
  • Accepted : 2023.08.25
  • Published : 2023.08.31
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Abstract

The Korea Strait comprises a continental shelf in a shallow sea that experienced glacio-eustastic sea-level changes during the Quaternary period. A long core of 76.6 m in length was acquired at the South Sea Drilling Project site (SSDP-101; 34°19.666'E and 128°16.335'N) with a 60 m water deep. The uppermost massive sand beds were interpreted as sandy sediments of the nearshore marine sand ridge in the shallow sea during the transgression of sea level, whereas the lower parts of alternating sandy and muddy beds were interpreted as deposits in marsh, estuary, and tidal flat environments. A three-layered geoacoustic model was reconstructed for the sedimentary succession in the high-resolution seismic profile based on a 140-grain size and sediment type of core SSDP-101. For the actual underwater simulation and experiments, the in-situ P-wave speeds were calculated using the sound speed ratio of the Hamilton method.

Keywords

Acknowledgement

The original data of marine geophysics and geology were acquired from the Korea Strait science program: Study on Quaternary stratigraphy and environmental changes in Korean sea (KIGAM, 2000; KR-00(B)-02). We are grateful to anonymous reviewers and Prof. Park, Kyung-Ae (Seoul National University) for their critical and helpful comments. WHR thanks Ms. Kang, Sol-Ip (Jeonbuk National University) for working on the computer graphics. This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2022R1F1A1063126) and 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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