Evaluation of Potential Geological Hazards in the Sea of Okhotsk from Conventional 3D Seismic Observations

The study presents novel data on the potential geological hazards on the shelf of the Sea of Okhotsk. The near-surface characterization is mainly based on the analysis of the conventional 3D seismic dataset (5–100 Hz). The special processing of the 3D data and the amplitude-based approach to the interpretation (AVO-analysis, seismic inversion) allows us to evaluate geohazards at different scales over a wide range of depths from the first meters to nearly 1 km from the sea bottom. The main types of the potential geohazards in the area are the gas-bearing sediments, zones of a focused fluid discharge, intervals with abnormal pore pressure and faults.