A new type of submerged rock drill, “MD-300PT” |
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| Authors: | Y Kinoshita H Oshika E Inoue |
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| Institution: | 1. Geological Survey of Japan, Marine Geology Department, Kawasaki Japan;2. Koken Boring Machine Co., Ltd. Japan |
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| Abstract: | A new type of rock drill, which has compact size and a simple mechanism and which can be automatically operated in water, was developed. The drill can obtain 75 cm of rock core from a rocky bottom covered by thin sediments at a maximum depth of 300 m.The drill was operated under a current of 1.5 knots in Sagami Bay south of Tokyo and obtained a 40-cm core of volcanic conglomerate of Miocene age from the slope of a small bank at a depth of 130 m. During the operation the vessel was not anchored. |
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