MARGINAL GULLY AND SCANP ON THE OUTER CONTINENTAL SHELF MARGIN OF THE EAST CHINA SEA

The analysis of marginal gully and scarp on the north outer margin of continental shelf of the East China Sea north of 29°N and west of 128°20′E shows that they lie on the outer margin of continental shelf and the top of continental slope in water depth from 160 m to 230 m, which can be linked disjointedly to a line. The gully and scarp are about 150 km long, 12-15 m deep and 0. 3- 3. 2 m wide, in trend of NNE. They appear as the natural boundary between continental shelf and continental slope. The sediments near the gully and scarp are heavy coarse sandy materials. In sub- bottom profiles, some shallow faults are found near the continental shelf break, and some slumps and creeps are found in sediment strata, which are closely related to the formation of the marginal gully and scarp on the outer continental shelf margin.