青藏高原班公—怒江缝合带现今运动状况的GPS观测研究

Present-Day Movement of Bangong Co-Nujiang Suture Zone,Tibetan Plateau,Inferred from GPS Measurements

利用青藏高原改则地区一条跨越班公—怒江缝合带的10站GPS剖面在2007—2009年的3期流动观测资料,采用自洽的统一参考框架方法分析研究了改则地区的现今地壳差异运动,得出该区域现今地壳应变率以南北向挤压为主,量值达(104.0±28.6)×10-9/a,同时兼有东西向拉张,量值约为(25.4±17.7)×10-9/a。利用半无限弹性空间的断裂位错模型和GPS速度矢量的约束,反演获得班公-怒江缝合带在该地区(即改则—洞错断裂)的现今运动以右旋走滑为主,走滑速率约为(7.4±0.8)mm/a。

Based on the measurements of a GPS profile,which is composed of 10 GPS stations across the Bangong Co-Nujiang suture zone around Gaize area of the Tibetan Plateau,observed 3 times from 2007 to 2009 in campaign mode,we investigated the present-day crustal deformation of the Gaize area,and revealed that the principal strains of the region are north-south compression and east-west extension with the rates of（104.0±28.6）×10^-9/a and（25.4±17.7）×10^-9/a,respectively.Using the half-space elastic dislocation model and constrained with the GPS velocity vectors of the GPS profile,we inversed the present-day movement of the Bangong Co-Nujiang suture zone at Gaize area（known as Gaize-Dongcuo fault）is right-lateral with a rate of about（7.4±0.8）mm/a.