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| 2008年于田7.3级地震前西昆仑地形变的GPS初步研究 | |
| 引用本文： | 李杰,王晓强,王琪,方伟,宋和平.2008年于田7.3级地震前西昆仑地形变的GPS初步研究[J].西北地震学报,2012,34(3):256-263. |
| 作者姓名： | 李杰 王晓强 王琪 方伟 宋和平 |
| 作者单位： | 1. 中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430070;新疆维吾尔自治区地震局,新疆乌鲁木齐 830011 2. 新疆维吾尔自治区地震局,新疆乌鲁木齐,830011 3. 中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430070;中国地震局地震研究所,湖北武汉430071 |
| 基金项目： | 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) |
| 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1.2～2.5 mm/a;震中以北的阿尔金左旋走滑断裂滑动速率为5 mm/a；震中北西面的康西瓦断裂的左旋走滑平均速率约为3～7 mm/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. |
| 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 |
Crustal Deformation in Western Kunlun Tectonic Zone from GPS Measurements before the Yutian M_S7.3 Earthquake in 2008 |
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| LI?Jie,WANG?Xiao-qiang,WANG?Qi,FANG?Wei and SONG?He-ping.Crustal Deformation in Western Kunlun Tectonic Zone from GPS Measurements before the Yutian M_S7.3 Earthquake in 2008[J].Northwestern Seismological Journal,2012,34(3):256-263. | |
| Authors: | LI?Jie WANG?Xiao-qiang WANG?Qi FANG?Wei and SONG?He-ping |
| Institution: | 1.Institute of Geophysics & Geomatics,China University of Geosciences,Wuhan 430074,China; 2.Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,China; 3.Institute of Seismology,CEA,Wuhan 430071,China) |
| Abstract: | 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. |
| Keywords: | Yutian Ms7 3 earthquake GPS measurement The west Kunlun tectonics zone Hori-zontal movement Siiping rate Maximum shear strain rate |
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