陕西中南部现今地壳垂直形变研究

收集陕西中南部1970年以来的多期精密水准测量数据，用基于GPS垂直运动速率约束的动态平差方法获得区域垂直运动速度场。分析表明，地壳垂直运动总体表现为山地、高原相对隆升，盆地相对下沉。相对于关中盆地，西部秦岭、陇山上升速率为4~5 mm/a，北秦岭造山带为2~3 mm/a，盆地北部的鄂尔多斯南缘为3~4 mm/a；相对于北秦岭，汉中盆地下沉速率为1.0 mm/a左右，安康等北大巴山裂谷下沉速率接近20 mm/a；秦岭北缘断裂垂直滑动速率为1.3~1.8 mm/a，华山山前断裂为2.0~2.8 mm/a，渭河断裂小于1.0 mm/a,渭河盆地北缘断裂为1.0~2.5 mm/a,南部断裂为0.7~1.1 mm/a。

Study of Crustal Vertical Movement in Central-Southern Shaanxi

We collect multi-period precision leveling data from the 1970s in central-southern Shaanxi and obtain the vertical velocity field of the area using the dynamic adjustment method based on GPS vertical velocity constraints. The result shows that the vertical movement of the crust is generally mountainous, the plateau relatively rises, and the basin’s relative subsidence. Relative to the Guanzhong basin, the rate of its rise in the west of Qinling mountains and Longshan in the west is 4~5 mm/a, that of the north Qinling orogenic belt is 2~3 mm/a, and that of the Ordos in the northern part of the basin is 3~4 mm/a. The subsidence rates of north Qinling and the north Dabashan rift at Ankang are about 1 mm/a and 2.0 mm/a, respectively. The vertical slip rate of the northern margin of Qinling fault is 1.3~1.8 mm/a, the frontal fault of Huashan is 2.0~2.8 mm/a, the Weihe fault is less than 1.0 mm/a, the northern margin fault of Weihe basin is 1.0~2.5 mm/a, while the southern faults of are 0.7~1.1 mm/a.