摘要
于华北板块南缘的北秦岭中段,在系统测量微断层的位移参数的基础上,通过采用滑动矢量拟合法,获得了该区自新生代以来的三期构造应力场的平均应力张量。三期应力场的方向及性质分别为:(1)以280°—310°方向拉伸为主的松弛期;(2)以305°—336°方向挤压为主的压缩期;(3)以294°—340°方向拉伸为主、辅以21°—68°方向挤压的现代扩张期。研究表明,最新一期即第三期构造应力场的特征与华北板块的区域构造应力场特征是基本一致的。
Obtained from the displacement of the microfaultssystematically measured along the middle section of northern Qinling on the southern borders of the North China Plate in Shaanxi Province by use of a method for fitting data of the fault-slip vector were the means stress tensors of the tectonic stress field since Cenozoic time. Three plases of stress field are:1) the stress relaxation in the direction of NW280-310°, 2) the compression in the direction of NW305-310° and 3) the relaxation (NW 294-340°) along with a secondary compression in the direction NE 21-68°. The result indicates that the characteristics of the third phase of the stress field in the area is essentially consistent with that of the regional stress field in the North China Plate.
出处
《地震地质》
EI
CSCD
北大核心
1991年第2期161-172,共12页
Seismology and Geology
关键词
构造应力场
新生代
陕西
秦岭
Shaanxi, Qinling Mt., Cenozoic, Micro-fault, Stress tensor, Tectonic stress field
