【摘要】 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。更多还原

【Abstract】 Based on the GNSS data processing results from the Sichuan area,following conclusions are obtained:1 Before the Ms 8.0earthquake in Wenchuan,there was almost no dextral strike-slip activity distinguished or compressional deformation on the Longmenshan fault zone and nearly 150 km north of it,and was deformation distinguished in the area of 100 kms west of Sichuan Basin——the Xianshuihe Anninghe Fault.2 Between the Ms 8.0earthquake in Wenchuan and Ms 7.0earthquake in Lushan,there was about a 5mm/a dextral strike-slip activity in the middle and northern sections of the Longmenshan fault zone,with no 3Ddeformation distinguished in and near the seismic source region.Meanwhile the sinistral deformation increased on the Xianshuihe Anninghe fault and east of the zone.3 The co-seismic deformation field of the Lushan earthquake was basically distributed for 10 kilometers around the seismic source region,with an epicenter bounded,on the east side as a dextral deformation,on the west side with a sinistral deformation.4 LS05 was about 12 km to the epicenter;the permanent vertical displacement momentum was around 7cm,with a horizontal thrust momentum of about 4cm,the horizontal strike-slip was about 5cm from the station.更多还原