中国东部海域及其邻区现代构造应力场研究  

The recent tectonic stress field of offshore of China mainland and adjacent areas

作　　者：徐杰[1] 周本刚[1] 计凤桔[1] 周庆[1] 高祥林[1] 吕悦军[2] 陈国光[1] 

机构地区：[1]中国地震局地质研究所,北京100029 [2]中国地震局地壳应力研究所,北京100085

出　　处：《地学前缘》2012年第4期1-7,共7页Earth Science Frontiers

基　　金：科学技术部地震行业专项研究项目(2007-08-55;202808018)

摘　　要：中国东部海域是指渤海、黄海和东海地区。前人利用震源机制解、井壁崩落和水压致裂等资料,分别对有关海区的现代构造应力场作过不同程度的研究。文中根据前人的工作并结合海陆地区新构造运动及其动力条件分析,对东部海域及邻区的现代构造应力场进行较深入的研究。该区现代构造应力场以水平至近于水平挤压作用为主要特征,压应力方向从北到南由NE逐渐转为NEE、EW、SEE至SE向,总体呈向东发散的扇形分布。构造应力作用强度具有非一致性,北强南弱。海域具有与大陆统一的现代构造应力场,相应可划为东北、华北和华南3个应力区。中国东部大陆和海域在青藏高原东部被印度板块挤出的构造块体往NE—SE方向滑动推挤及东边太平洋和菲律宾海板块向NWW俯冲推挡的共同作用下,形成现代构造应力场,且青藏高原东部被挤出块体东向滑动的推挤是现代构造应力场产生的主要动力。The offshore of China mainland includes the Bohai Sea,Yellow Sea and East China Sea.Using data of focal mechanism solutions,borehole breakouts and hydraulic fractures,there have been various degree studies on the recent tectonic stress field of this region and adjacent areas.Based on these previous work,in combination with analyses of neotectonic movements of marine area and land and dynamic conditions,we attempt to make a further research on this subject.Our result shows that the recent tectonic stress field of this region is characterized by nearly horizontal compression,which is in NE direction in the north and gradually turns to NEE,EW,SEE and SE in the south,exhibiting a fan shape of diverging toward east.The intensity of tectonic stress is not uniform,relatively strong in the north and weak in the south.The marine and continental areas share a common recent tectonic stress field,which can be divided into Northeast China,North China and South China stress provinces.The generation of such a stress field is associated with the extrusion toward northeast and southeast at the eastern margin of the Tibetan plateau due to the continued northward indentation of the India plate,as well as the effect of the westward subduction of the Pacific and Philippine Sea plates in the east.And the eastward extrusion by the Tibetan plateau seems to be the dominant driving force.

关 键 词：中国东部海域 震源机制解 井壁崩落 现代构造应力场 水平挤压作用 

分 类 号：P315.727[天文地球—地震学]