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对四川地区GNSS观测数据进行处理,获得如下结果:1汶川Ms 8.0级地震之前龙门山断裂带及其以北近150km的范围内几乎不存在可分辨的右旋走滑活动和压性形变,四川盆地以西-鲜水河安宁河断裂带以东约100km的范围内几乎也不存在可辨的形变;2汶川Ms 8.0级地震之后芦山Ms 7.0级地震之前,龙门山断裂带中、北段存在约5mm/a右旋走滑活动,芦山震源及附近地区的三维形变一直处在闭锁状态,鲜水河安宁河断裂带及其以东的左旋形变有所增强;3芦山地震可变的同震形变场基本分布于以震源为中心的数十km范围内,大致以震中为界东侧呈右旋形变,西侧呈左旋形变;4距震中较近约12km的LS05震时“永久性”垂向位移量约7cm,水平向逆冲量约4cm,走滑量约5cm。
The GNSS observations in Sichuan Province are processed to obtain the following results: 1. There is almost no resolvable dextral strike-slip events and compressive deformation in the Longmen Shan fault zone and its vicinity of 150km north of Ms 8.0 Wenchuan Ms 8.0 earthquake. Sichuan, There is almost no discernable deformation in the range of about 100 km to the east of the Anninghe fault zone in the west of the basin. Before the M Ms 8.0 MS 8.0 Ms 8.0 Wenchuan earthquake, 5mm / a dextral strike-slip event. The three-dimensional deformation of the Lushan earthquake source and its vicinity has been at a latching state, and the left-lateral deformation of the Anninghe fault zone and the east of the Xianshuihe River has been enhanced. 3 The variable coseismic deformation of the Lushan earthquake The field is basically distributed in the area of tens of km centered on the source, with dextral dextral on the east side and dextral dextral on the west side, and the “permanent” Vertical displacement of about 7cm, horizontal thrust to about 4cm, the amount of slip about 5cm.