摘要
对鲜水河断裂及两侧地块的GPS观测，得到欧亚框架下运动速度场．基于得到的运动速度，采用刚性地块假设下的最小二乘拟合方法，得到川滇地块与川青地块的运动速度分别为19．5±3．4和13．2±3．4mm/a，川滇地块相对川青地块的运动速度为8．3±3．4mm/a，鲜水河断裂的运动速度为7．9～8．8mm/a（甘孜-乾宁段为8.8±3.5mm/a，乾宁一康定段为7．9±3．3mm/a）．上述研究结果表明，鲜水河断裂、川滇地块与川青地块所围成的区域为重要构造活动区．
Based on the GPS measurement of the Xianshuihe fault and blocks on its both sides, Chuan-Dian block and Chuan-Qing block, a velocity field on the Eurasia reference frame was obtained. The movement velocities of GPS stations in the region were estimated using least-squares fitting under the hypotheses of rigid mass. The fitting result shows that the movement velocities of the Chuan-Dian and Chuan-Qing blocks are 19.5 ± 3.4 and 13.2 ± 3.4 mm/a respectively, and the Chuan-Qing block moves at a speed of 8.3 ±3.4 mm/a relative to the Chuan-Qing block. The movement velocity of the Xianshuihe fault is 7.9 to 8.8 mm/a （ it is 8.8 ± 3.5 mm/a in Garze- Qianning segment and 7.9 ± 3.3 mm/a in Qianning-Kangdin segment）. The above results show that the region covered the Xianshuihe fault, the Chuan-Dian and Chuan-Qing blocks is an important tectonic activity zone.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2005年第3期313-317,共5页
Journal of Southwest Jiaotong University
基金
中国地质调查局资助项目(200313000024)
国家自然科学基金主任基金资助项目(40342017)
美国自然科学基金资助项目(INT9005305)
