摘要
首次利用三峡重庆地区GPS、钻孔应变及数字地震资料,综合研究该地区水平形变场及构造应力场。结果表明,各站点相对丰都龙河站运动速率在0~3mm/a,呈现一定的右旋特征;整个区域表现为压性特征,区域主压应变方向为NW向及NE向;最大剪应变等值线在渝西南、渝东北及与渝东南分别出现高梯度带,与主要地震活动区域相对应。
Using GPS, borehole strain and digital seismic data, we study the horizontal deformation and tec- tonic stress fields in the Chongqing area. The results show that the inside of the Chongqing region presents relative motion of 043 mm/a and presents certain features of the dextral. The region as a whole performs as pressure characteristic. The predominant principal compressive strain direction of the local region is in a NWW direction, the direction of the tectonic stress field direction is consistent, the direction of the part of the region near the impact fracture appears to be a NNE direction, and the maximum shear strain contour line is southwest of Chongqing. Northeast and southeast Chongqing show a high gradient zone, and the gradient belt corresponds to the Chongqing area of the main area of seismic activity.
出处
《大地测量与地球动力学》
CSCD
北大核心
2018年第2期129-131,146,共4页
Journal of Geodesy and Geodynamics
基金
中国地震局"三结合"课题(3JH-162206)
中国地震局地震科技星火计划(XH15035Y)~~
关键词
重庆:GPS
钻孔应变
形变场
应力场
Chongqing
GPS
borehole strain
deformation field
tectonic stress field
