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Seismic Imaging of a Tidal Flat: A Case Study for the Mineopo Area  

Jou, Hyeong-Tae (Korea Ocean Res. & Dev. Inst.)
Kim, Han-Joon (Korea Ocean Res. & Dev. Inst.)
Lee, Gwang-Hoon (Dept. of Env. Expl. Eng., Pukyong Nat'l Univ.)
Lee, Sang-Hoon (Korea Ocean Res. & Dev. Inst.)
Jung, Baek-Hoon (Korea Ocean Res. & Dev. Inst.)
Cho, Hyun-Moo (Sch. Of Earth & Env. Sci., Seoul Nat'l Univ.)
Jang, Nam-Do (Korea Ocean Res. & Dev. Inst.)
Publication Information
Geophysics and Geophysical Exploration / v.11, no.3, 2008 , pp. 197-203 More about this Journal
Abstract
A shallow high-resolution seismic reflection survey was carried out at the Mineopo tidal flat on the western coast of Korea. The purpose of the survey was to investigate shallow sedimentary structure of the tidal flat associated with the recent sea level change. A total of 795 shots were generated at 1 m interval from a 5-kg hammer source and recorded on 48 channels of 100 Hz geophones along two mutually perpendicular profiles. The water-saturated ground condition resulted in suppressed ground rolls by significantly decreasing rigidity. In addition, seismic velocities over 1500 m/s provided easy segregation of reflected arrivals from lower velocity noise. As a consequence, seismic sections from the study area show significantly higher resolution and signal to noise ratio than conventional land seismic sections. The tidal flat consists of 5 sedimentary sequences above acoustic basement. The seismic sections reveal the continuous structure of the tidal flat formed in association with sea level rise during the Holocene.
Keywords
near-surface seismic survey; seismic reflection method; tidal flat; sea level change;
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