The seabed stability zonation based on the marine geohazards evaluation in China

This paper analyzes and evaluates the seabed stability based on the marine geohazards in order to reflect the appropriate level of the geological environment of China's offshore to the human engineering activities. This paper proposes the concept of the evaluation of the seabed stability, and the indicator system of the evaluation of the seabed stability is set based on the earthquake zonation, engineering geology zonation, topography zonation, direct geohazards and restricted geohazards. And the weighted value of all evaluation indicators has been determined by using analytic hierarchy process. The seabed of China's offshore is divided into 6'×6' grid cells and the evaluation result is calculated by the map layer data of the marine geohazards map, earthquake zonation map, topography map and other digital layers with fuzzy comprehensive evaluation method. The seabed stability of China's offshore is divided into five grades from stable status to unstable status.