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; 34o19.666′E and 128o16.335′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.

Introduction
Regional Marine Geology
Materials and Methods
Results
    Seismic and sediment data
    Physical and geoacoustic property
    Geoacoustic Model
Conclusions
Acknowledgments

• Woo-Hun Ryang(Division of Science Education and Institute of Science Education, Jeonbuk National University, Jeonju 54896, Korea)
• Seong-Pil Kim(Marine Geology & Energy Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea) Corresponding author