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pp.93-101
The P-wave refraction prospecting was carried out using the 12 channel enhancement seismograph in Reclaimed Land Region A of Cheonsu Bay, which has been stabilized for agriculture by Hyundai Construction Co. since 1984. The subsurface layer structure was interpreted in terms of the seismic velocity of sediments, the depths of the velocity boundaries estimated from timedistance curves of 6 prospecting lines and the drilling core data in adjacent sites. The velocity distribution of subsurface layer is divided into the 1st layer, the 2nd one, the 3rd one and the deepest one, and their velocity ranges are respectively less than 800 m/s, 800-1700 rNs, 1700-2700 rNs and more than 2700 m/s. The 1 st layer is aeration zone, the 2nd one Cheonsuman Formation deposited in the Holocene intertidal environment, the 3rd one the semi-consolidated Pre-Holocene Kanweoldo Formation and weathered zone of the baserock, and the deepest one the base-rock of schist or granite. In general, the thickness of the 1st layer is about 2 m, the 2nd one 5-20 m and the 3rd one 15-22 m. The estimated depth to the base-rock varies locally from 22 m to 33 m and on the whole increases as it comes near the lake.
