| 利用长期GPS观测资料分析昆仑断裂现今滑动速率与地壳活动特性 |
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| 引用本文： | 郑刚.利用长期GPS观测资料分析昆仑断裂现今滑动速率与地壳活动特性[J].大地测量与地球动力学,2019,39(6):557-561. |
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| 作者姓名： | 郑刚 |
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| 作者单位： | 武汉大学卫星导航定位技术研究中心,武汉市珞喻路129号,430079;武汉大学地球空间环境与大地测量教育部重点实验室,武汉市珞喻路129号,430079 |
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| 基金项目： | 国家重点研发计划;中央高校基本科研业务费专项资金;武汉大学地球空间环境与大地测量教育部重点实验室开放基金 |
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| 摘 要： | 利用昆仑断裂区域的GPS观测资料，通过高精度数据处理获取区域地壳运动速度场，进而通过速度剖面线估算昆仑断裂现今形变速率。结果表明，昆仑断裂在94°E、101°E、103°E附近的现今滑动速率分别为12.8±1.9 mm/a、6.1±0.9 mm/a、0.7±2.1 mm/a。进一步分析得到如下结论：1）本文估算的昆仑断裂10 a尺度的现今滑动速率和万年尺度的地质学结果基本一致，说明现今滑动速率可以作为断裂地震风险性评估的有效输入数据；2）昆仑断裂东段具有向东逐渐减小的滑动速率，减少的速率可能主要被阿尼玛卿山的地壳增厚和断裂东段的顺时针旋转所吸收；3）昆仑断裂的西大滩-东大滩地震空区位于高应变区。
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| 关 键 词： | GPS观测 昆仑断裂 地壳形变 滑动速率 应变场 |
The Use of Long-Term GPS Observations to Analyze Present-Day Slip Rate and Crustal Activity Characteristic of the Kunlun Fault |
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| ZHENG Gang.The Use of Long-Term GPS Observations to Analyze Present-Day Slip Rate and Crustal Activity Characteristic of the Kunlun Fault[J].Journal of Geodesy and Geodynamics,2019,39(6):557-561. |
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| Authors: | ZHENG Gang |
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| Abstract: | In order to study the present-day slip rate and crustal activity characteristic of the Kunlun fault, this paper derives a regional GPS velocity field from GPS observations in the Kunlun fault region using high-precision data-processing strategy, and it then estimates present-day deformation rates of the Kunlun fault based on GPS velocity profiles. The result indicates that present-day slip rates of the Kunlun fault near 94°E, 101°E and 103°E are 12.8±1.9 mm/a, 6.1±0.9 mm/a and 0.7±2.1 mm/a, respectively. Further study and analysis show the following conclusions: (1) The present-day slip rates on the 10-year timescale along the Kunlun fault estimated by this paper are consistent with the geological results on the 104 years timescale, implying that the present-day slip rates can be a useful input data set for the seismic hazard assessment; (2) The eastern Kunlun fault has an eastward-decreasing slip rate. We argue that the crustal thickening across Anyemaqen mountains and the clockwise rotation of the eastern Kunlun fault accommodate most of the decrease; (3) The Xidatan-Dongdatan seismic gap in the Kunlun fault lies in the high-strain region. |
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| Keywords: | GPS observations Kunlun fault crustal deformation slip rate strain field |
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