Abstract
Abstract High‐resolution seismic‐reflection data acquired in the Pearl River mouth region of the South China Sea show the following seafloor instabilities: shallow faults, buried channels, gas‐charged sediments, mud diapirs and sand waves. This paper focuses on the interpretation of their depositional environments and models by means of an analysis of the seismic facies, a study of the dynamic characteristics of seismic facies parameters, and a determination of the velocity‐density properties of the geological units, depths, and stratification continuity. The causes of the instabilities are briefly discussed with examples in three aspects: (1) sea‐level change since Quaternary; (2) neotectonic movement mainly represented by earthquakes and fractures in this region; and (3) oceanographic‐hydrodynamic processes such as waves, tides, and currents. This paper shows that the high‐resolution seismic prospecting technique is a highly valuable means of discerning and studying the subbottom geohazards, and evaluat...
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