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。
Using the data of GPS measurements, the velocity field of present crustal movement before the Yutian MsT. 3 earthquake in 2008 in the Western KunIun 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 Altyntagh 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 MsT. 3 earthquake occurred at faults intersection zone and also the maximum shear strain rate zone.
出处
《西北地震学报》
CSCD
北大核心
2012年第3期256-263,共8页
Northwestern Seismological Journal
基金
地震科技星火计划(XH1030)
地震联合基金(A08056)
新疆维吾尔自治区科学研究和技术开发(含攻关)项目(200741121)
地震行业科研专项(201008004)
关键词
于田7.3级地震
GPS测量
西昆仑构造带
水平运动
滑动速率
最大剪应变
Yutian Ms7.3 earthquake
GPS measurement
The west Kunlun tectonics zone
Hori-zontal movement
Siiping rate
Maximum shear strain rate