The calculation formula and parameter of sediment siltation should accord with the arenaceous and silt coast condition. The back and sudden magnitude siltation quantity is calculated here.

Silt turbidite (landslide) layers on the deep sea floor far off the coast from underwater landslides, likely caused by strong seismic shaking.

The consolidated silt is found in silty sand coast, river mouth etc., which brings lots of engineering problems, which make it necessary to research on.