【摘要】 利用GPS观测资料计算并获取了2008年新疆西昆仑地区于田7.3级地震发生前的现今地壳运动速度场,通过速度场分布研究了区域内主要断层的活动速率。结果表明:震中以南的龙木错断裂呈左旋走滑性质的运动特征,走滑速率为1.2～2.5mm/a;震中以北的阿尔金左旋走滑断裂滑动速率为5mm/a;震中北西面的康西瓦断裂的左旋走滑平均速率约为3～7mm/a。区域应变场分布一定程度上受断裂带分布的影响。7.3级地震就位于断裂活动交汇的部位和最大剪应变率高值区的边缘。更多还原

【Abstract】 Using the data of GPS measurements,the velocity field of present crustal movement before the Yutian MS7.3 earthquake in 2008 in the Western Kunlun tectonic zone,Xinjiang region,is calculated,and the active rates of regional maijor faults are estimated by analyzing the velocity field.The result shows that the active feature of Longmucuo fault at south of the earthquake epicenter is left-lateral strick sliping with rate of 1.2~2.5 mm/a,the sliping rate of Altyn-tagh left-lateral fault at north of the epicenter is about 5 mm/a,and the sliping rate of Kangxiwa left-lateral fault at northweast of the epicenter is 3~7 mm/a.The distribution of regional strain field is affected in some extent by the distribution of faults in the region.Yutian MS7.3 earthquake occurred at faults intersection zone and also the maximum shear strain rate zone.更多还原