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对渤海及周围地区地质构造、地球物理场特征及地震活动特征进行了分析和研究 .结果表明 :该区域发育有NNE、NW和NWW向 3组断裂 .在渤海海域NNE向的郯庐断裂被NWW向断裂分割为 3段 ,中段地震活动最强 ,发生过 3次 7级以上地震和 3次 6级以上地震 .在空间上 ,地震活动可以划分为 2个带 ,即郯庐地震带和燕山 渤海地震带 .渤海中部地区热流值偏高 ,莫霍界面和康腊界面隆起 ,上地幔高导层埋深浅 ,为 30～ 5 0m .
The geological structure, geophysical field characteristics and seismic activity characteristics of the Bohai Sea and the surrounding area are analyzed and studied.The results show that there are three sets of NNE, NW and NWW faults in this area.The NNE-directed Tanlu fault in the Bohai Sea area is NWW The fault is divided into three segments, the strongest seismic activity in the middle, three earthquakes of magnitude 7 or more, and three earthquakes of magnitude 6 or above.Seismic activities can be divided into two zones in space, namely, the Tanlu seismic belt and the Yanshan Bohai Sea Seismic zone.The value of heat flow is high in the central Bohai Sea, the Moho interface and the Kang’la interface are uplifted, and the upper mantle high conductivity layer is shallow, ranging from 30 to 50 m.