中国东部海域断裂构造格架与地震活动研究  

Fault Structure Frame and Seismicity in the Sea on the EastSide of Chinese Mainland

作　　者：高战武 缑亚森 钟慧 任治坤[2] 周本刚[2] 徐杰[2] Gao Zhanwu;Gou Yasen;Zhong Hui;Ren Zhikun;Zhou Bengang;Xu Jie(China Earthquake Disaster Prevention Center,Beijing 100029,China;Institute of Geology,China Earthquake Administration,Beijing 100029,China)

机构地区：[1]中国地震灾害防御中心,北京100029 [2]中国地震局地质研究所,北京100029

出　　处：《震灾防御技术》2021年第1期11-18,共8页Technology for Earthquake Disaster Prevention

基　　金：国家重点研发计划(2017YFC1500401)。

摘　　要：渤海、黄海和东海等中国东部海域在地质构造上是大陆向海的自然延伸,海域内的构造方向与大陆一致,均为NNE-NE向,但属于不同的二级大地构造单元,渤海和北黄海属于华北地块,南黄海属于扬子地块,东海属于华南地块。由于各地块与现今活动板块边界位置不同,构造与地震活动性差异较大,渤海和北黄海地区地震活动主要受印度板块与欧亚板块碰撞形成的东喜马拉雅构造节远场效应影响,地震活动强烈;南黄海地区以中强地震活动为主;东海地区地震活动主要受菲律宾海板块与欧亚板块碰撞形成的琉球俯冲带影响。冲绳海槽是正在形成的(活动的)边缘海盆地,不仅有浅源地震,且有中源地震活动。东海陆架盆地由于受冲绳海槽扩张的影响,停止发育,构造与地震活动相对较弱。The sea on the east side of Chinese mainland are Bohai,the Yellow Sea and the East China Sea from notrh to south.The tectonics in the sea area are natural extensions of the mainland.The tectonic direction of the sea area is the same as that of the continent,which is NNE-NE,but belongs to different secondary tectonic units.The Bohai Sea and the North Yellow Sea belong to the North China block,the South Yellow Sea belongs to the Yangtze block,and the East China Sea belongs to the South China block.The tectonic and seismic activities are quite different due to the different positions of the boundaries between the blocks and the active plates.The seismicity in the Bohai Sea and the North Yellow Sea is mainly affected by the far-field effect of the eastern Himalayan tectonic syntaxis which is formed by the collision between the Indian plate and the Eurasian plate.The South Yellow Sea area is dominated by moderate earthquakes.The seismicity in the East China Sea is mainly affected by the Ryukyu subduction zone formed by the collision between the Philippine Sea plate and the Eurasian plate.Okinawa trough is an active marginal sea basin which is forming.There are not only shallow focus earthquakes,but also intermediate focus earthquakes.Due to the expansion of Okinawa Trough,the East China Sea shelf basin stopped developing,and its tectonic and seismic activities were relatively weak.

关 键 词：断裂构造格架 地震活动 中国东部海域 

分 类 号：P315[天文地球—地震学] P542[天文地球—固体地球物理学]