How thick are sediment deposits in parts of the East China Sea?

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In the East China Sea, sediment deposits vary in thickness depending on the location. Seismic profiling has identified geologic structures beneath the ocean floor that include nearly parallel folds and rock ridges. These ridges, located near the northern limits of the sea, the edge of the continental shelf, and along the Ryukyu Islands, have acted as barriers for sediment transported by the Yangtze and Huang He rivers. Between these ridges, sediment deposits can reach a thickness of up to one mile.1