渤海及邻区地震地质、地球物理场和地震活动特征
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摘要
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 .
Characteristics of geological structure ,geophysical field and seismic activity of the Bohai Sea and its vicinity are analysed and studied. The results show three groups of fault of NNE,NW and NWW developed in the region .The Tan Lu fault of NNE is divided into three section by faults of NWW. The seismicity is the strongest in the middle section among them .Three M≥7 earthquakes and three M≥6 earthquakes occurred in the section .The earthquakes are distributed along two belts,forming the Tan Lu seismic belt and Yanshan Bohai seismic belt.In the middle part of the Bohai Sea ,the values of heat flow are the highest, the Moho discontinuity and the Conrad discontinuity have risen ,depth of the low resistivity layer of the upper mantle is 30～50 km, being more shallow.
Characteristics of geological structure ,geophysical field and seismic activity of the Bohai Sea and its vicinity are analysed and studied. The results show three groups of fault of NNE,NW and NWW developed in the region .The Tan Lu fault of NNE is divided into three section by faults of NWW. The seismicity is the strongest in the middle section among them .Three M≥7 earthquakes and three M≥6 earthquakes occurred in the section .The earthquakes are distributed along two belts,forming the Tan Lu seismic belt and Yanshan Bohai seismic belt.In the middle part of the Bohai Sea ,the values of heat flow are the highest, the Moho discontinuity and the Conrad discontinuity have risen ,depth of the low resistivity layer of the upper mantle is 30～50 km, being more shallow.
引文
①山东省工程地震研究中心 .东营市城区及八分场地区地震小区划报告 .1999.
②国家地震局地球物理研究所 ,山东省地震局 .胜利油田部分地区地震小区划报告 .1991.
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②国家地震局地球物理研究所 ,山东省地震局 .胜利油田部分地区地震小区划报告 .1991.
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[2 ] 史志宏 ,殷秀华 ,魏梦华 ,等 .华北地区地壳深部结构与地震活动 [J].地震科学研究 ,1983 ,(5 ) :30— 36 .
[3] 李家正 ,刘敬宽 .华北地区重磁场特征与地震关系 [J].地震科学研究 ,1983 ,(5 ) :19— 2 2 .
[4 ] 吴乾藩 ,谢毅真 ,祖金华 ,等 .华北地热场研究 [J].中国地震 ,1988,4(1) :15— 19.
[5 ] 陈墨香 .华北地热 [M ].北京 :科学出版社 ,1988.
[6 ] 魏光兴 ,刁守中 ,周翠英 ,等 .郯庐带地震活动性研究 [M].北京 :地震出版社 ,1993 .
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