摘要
为了研究三峡坝库区的地壳稳定性，根据奥陶－侏罗纪地层中构造变形的实际观测资料，计算了秭归龙会观５．１级震区及其邻区新生代以来区域应力场的主应力方向。结果表明：主压应力为北东东向，主张应力为北北西向；现代构造应力场与新生代以来应力场基本一致；晚第三纪以来，该区构造应力场相对稳定和统一。
On the basis of observations of tectonic deformation in strata of the Ordovician- Jurassic period,the orientations of maximum principal stress since the cenozoic Era in the epicentral area and its vicinity of Zigui Longhuiguan earthquake(Ms=5. 1) are calculated. The results show that the orientations of principal compressive stress and principal tensile stress are NEE and NNW respectively. The modern tectonic stress field is in keeping with that since cenozoic Era. Thus,it is considered that crustal stress field in the area investigated are relatively stable and uniform since Neogene.
出处
《地壳形变与地震》
CSCD
2000年第2期61-65,共5页
Crustal Deformation and Earthquake
关键词
构造应力场
地震活动
地壳应力场
水库区
crustal stress, tectonic stress field, cenozoic era, seismic activity
