基于三峡重庆库区2008—2012年GPS观测资料,利用块体的整体旋转线性应变模型,首次获取了该地区的地壳水平运动及应变场特征.结果表明:三峡重庆库区主应变以压应变为主,方向近似为北西向;最大剪应变高值区集中分布在该地区的华蓥山断裂与金佛山断裂,量值均达到1.4×10^-8;区域主压应力方向与大范围构造应力场基本一致,但方位角在华蓥山断裂与金佛山断裂两侧具有明显偏转的特征,反映出上述地区是三峡重庆区内的地壳构造活动区域.
Based on the GPS data between 2008 and 2012 in Chongqing area of Three Gorges Reservoir, by using of the integral-rotation linear strain model, the crustal horizontal deformation-strain characteristics in this area are obtained for the first time. The results show that in Chongqing area of Three Gorges Reservoir the principal strain is mainly the compressive strain and its direction is approximately north-west, the maximum shear strain concentrates in the regions of Huayingshan fracture and Jinfo fracture, whose value reaches to 1.4 ×10^-8, and the direction of regional principal compressive stress is same with the tectonic stress field in the wide range, but the azimuth on both sides of Huayingshan fracture and Jinfo fracture have the characteristics of significant deflection, which reflects that the above areas are the active tectonic regions in Chongqing area of Three Gorges Reservoir.