渭河盆地中部区域地壳形变及应变的分布特征

摘要

On the basis of the "digital seismic network engineering" GPS monitoring results, and combined with regional tectonic features,the 2D finite element model of the Weihe basin central region is built. According to the above, the present crustal deformation-strain distribution characteristics of the studied area are obtained. The results show that the Xi' an-Xianyang area is of significantly high value of the surface expansion and mainly tensile strain within the area, the value respectively reaches more than 2. 0 × 10-6 /a and 3.5×10-6/a. Thus the present crustal tensile tectonic activity of Xi' an-Xianyang area is strong.%基于中国地壳运动观测网络工程项目的GPS监测成果,结合区域构造特点构建了渭河盆地中部区域二维有限元模型,以此获取了该区域现今地壳形变-应变分布特征.结果表明:该区域内西安、咸阳地区是面膨胀及主张应变显著高值区,量值分别为2.0×10-6/a及3.5×10-6/a,说明西安、咸阳地区现今地壳拉张构造活动较强烈.