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The quality of seismic is important for interpretation. Prestack Depth Migration produce better quality of seismic imaging. The seismic generated through PSDM method has better seismic reflector and geological structure appearance compared to Prestack Time Migration (PSTM) method. Accurate interval velocity modeling is a key in PSDM process, involving dix transformation, coherency inversion, and tomography. Comparison between PSTM and PSDM show that PSDM offer better imaging for interpretation because PSDM has better seismic reflector continuity and good geological appearance.

Gas-charged sediment is one of the parameter for geohazard study in infrastructure, especially in a swamp area. Instability of sediment layer for example subsidence and landslide result in geohazard potential is caused by gas-charged sediment. The seismic single channel can be used to identify gas charged sediment location. Seabed morphology is collected from bathymetry and tidal survey. From the seismic profile, interpretation shows gas-charged sediment indication in Line A and Line B. Those indications emerged by the presence of acoustic turbid zone and acoustic blanking. The location of Line A and Line B will be the spotlight in next geotechnical port construction study.