甘肃及邻近地区构造应力场特征研究及有关问题的讨论  

STUDY ON CHARACTERS OF TECTONIC STRESS FIELD IN GANSU AND ITS ADJACENT AREAS AND DISCUSSION ON THE CONCERNED PROBLEMS

作　　者：何秀琴[1] 王多杰[1] 

机构地区：[1]国家地震局兰州地震研究所

出　　处：《甘肃地质学报》1994年第2期31-41,共11页Acta Geologica Gansu

摘　　要：通过大量的实际资料，研究了甘肃及邻近地区的新构造应力场和现代构造应力场。并根据研究结果，对新构造应力场和现代构造应力场之间的继承性、随时间推移而发生的变化以及动力来源和构造应力场作用下活动断裂与地震的关系等问题进行了讨论。Studying the Neogene folds ,asaemblage forms and structural features of Cenozoic active basins,and neotectonic stress field reflected by active faults and their mechanical properties,it is consideredthat the trajectories of neotectonic principal compressive stresses in Gansu and its adjacent areas showNE-SW in direction,and from west to east and from north to south,their directions gradually turnfrom NNE to NE,NEE up to EW.Based on the investigation,the recent crustal deformation bands due to great earthquakes andmechanism data of earthquake foci are analyzed and discussed.The results show that the dominant di-rection of principal compressive stress in tecton ic stress field is NE. In Hexi Corridor to the west of theGulang-Lanzhou Line and in the north of Qinghai-Xizang Plateau,the principal compressive stressfields show NE-SW in direction.Though there is a small error,they overall are consistent,about N35°E. On the north segment of the South-North Tectonic Belt to the east of the Gulang-Lanzhou Line,thedirection of principal compressive stress field is NE-NEE. In the region of Longxi and its south, thestress field show NEE-DE in direction . Based on the above-mentioned results.the authors discussed the inheritability between neotectonicstress field and current tectonic stress field, their changes with time and dynamic source,as well a the relationship between earthquakes and active fault under the action of tectonic stress field,etc.

关 键 词：甘肃 构造应力场 地震 

分 类 号：P554[天文地球—构造地质学]