【摘要】 本文依据大榭岛西北海域的测深、浅地层剖面和底质土工试验资料，详细分析了该海域海底地形形态、微地貌状况、浅部地层结构及底质工程性质，发现该海域海底地层断陷构造明显，并圈定了地层断陷的范围，探讨了其形成的原因和发生的时间。更多还原

【Abstract】 Based on the information about sounding, subbottom profile and substrate soil mechanics test obtained in the northwestern sea area of the Daxie island, the sea-floor relef, micro geomophological position, subbottom profile structure and sounding engineering characters of the area were analyzed in detail. The result shows that the subbottom fault structure is obvious.In addition,in this paper, the limits of the strate fault were defined,’and the origin and time of the strate fault were also discussed.更多还原