The form of sedimentary layers revealed on the continuous seismic profiling records

Abstract

Hydrographic Department of Japan has been earring out continuous seismic reflection profiling surveys of the Japanese waters since 1967. These surveys cover continental margin and ocean floor of the Western Pacific. Various kinds of sedimentary layers form are revealed to these records. The deposition process of sedimentary particles is grouped into two types ; (1) blanket layers covering submarine relieves as snow fall, and (2) depression filling layers as dammed up water. These two types are however basic forms which change features from difference of submarine topography, sedimentary supply, crustal movement, sea level changing, etc. Moreover, these original forms are often modified by later deformation and dislocation.