对四川区域网多年数据进行处理,得到欧亚框架下的测站运动速度,采用刚性地块假设下的最小二乘拟合方法,得到川滇、川青、扬子地块的运动速度分别为(17.6±1.0)mm/a、(11.4±0.7)mm/a、(9.6±1.1)mm/a,地块运动方向逐渐由SE向SEE变化;作为川滇地块东边界的鲜水河断裂、安宁河-则木河断裂运动速度远大于龙门山断裂,显示了其较强的活动性。
GPS data of long duration from Sichuan regional network were processed by GAMIT/GLOBK,and a velocity field relative to the Eurasian reference frame was obtained.Using the GPS stations velocities involved,crustal block horizontal movement velocity was estimated by least-square fitting under the hypotheses of rigid mass.The fitting result shows that the velocities of Chuan-dian,Chuan-qing and Yang-zi block are(17.6±1.0)mm/a,(11.4±0.7)mm/a,(9.6±1.1)mm/a respectively and the direction of their movement changes ...