| 综合利用多种地壳形变观测资料计算鲜水河断裂带现今滑动速率 |
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| 引用本文： | 李铁明,祝意青,杨永林,徐云马,安艳芬,张瀛,冯胜涛,槐岩珂,杨九元.综合利用多种地壳形变观测资料计算鲜水河断裂带现今滑动速率[J].地球物理学报,2019,62(4):1323-1335. |
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| 作者姓名： | 李铁明 祝意青 杨永林 徐云马 安艳芬 张瀛 冯胜涛 槐岩珂 杨九元 |
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| 作者单位： | 1. 中国地震局地质研究所, 北京 100029;2. 中国地震局第二监测中心, 西安 710054;3. 四川省地震局测绘工程院, 四川雅安 625000;4. 中国地震局第一监测中心, 天津 300180;5. 长安大学地质工程与测绘学院, 西安 710054 |
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| 基金项目： | 国家自然科学基金（41374026，41874092）资助. |
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| 摘 要： | 本文首先沿走向将鲜水河断裂带划分为炉霍、道孚、乾宁、康定和磨西五个断裂段,利用沿断裂带布设的跨断层短基线、短水准场地测量资料计算了近场的断层活动参数,利用覆盖断裂带相对较大区域的重力、GPS观测资料计算了重力场动态变化、GPS速度场.基于重力场动态变化和GPS速度场采用蚁群算法和粒子群算法(具有全局优化的优势)分别反演计算了五个断裂段断层活动参数,将结果中的走滑分量作为五个断裂段的现今走滑速率.通过对以上三类现今走滑速率及五个断裂段的地质平均滑动速率进行融合与对比分析,将重力资料反演计算结果作为断裂带整体走滑速率,与跨断层短基线、短水准测量计算的断层滑动速率结果进行对比分析,初步判定了各跨断层短基线、短水准场地所跨断裂的性质,最终给出了五个断裂段的现今整体左旋走滑速率和部分分支断裂左旋走滑速率,结果为:(1)炉霍段为9.13mm·a~(-1),虾拉沱区域西支断裂为2.46mm·a~(-1),东支断裂为5.84mm·a~(-1).(2)道孚段为8.57mm·a~(-1),东南段沟普区域西支断裂为1.78mm·a~(-1),东支断裂为6.79mm·a~(-1).(3)乾宁段为7.67mm·a~(-1).(4)康定段为6.14mm·a~(-1).(5)磨西段为4.41mm·a~(-1).本文还定性讨论了断裂带两侧重力、GPS测点覆盖范围内活动地块的三维弹塑性变形和古地震、历史地震造成的永久位错.
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| 关 键 词： | 鲜水河断裂带 地壳形变测量 分段 反演计算 滑动速率 |
| 收稿时间： | 2018-03-30 |
The current slip rate of the Xianshuihe fault zone calculated using multiple observational data of crustal deformation |
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| LI TieMing,ZHU YiQing,YANG YongLin,XU YunMa,AN YanFen,ZHANG Ying,FENG ShengTao,HUAI YanKe,YANG JiuYuan.The current slip rate of the Xianshuihe fault zone calculated using multiple observational data of crustal deformation[J].Chinese Journal of Geophysics,2019,62(4):1323-1335. |
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| Authors: | LI TieMing ZHU YiQing YANG YongLin XU YunMa AN YanFen ZHANG Ying FENG ShengTao HUAI YanKe YANG JiuYuan |
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| Institution: | 1. Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. Second Crust Monitoring and Application Center, China Earthquake Administration, Xi'an 710054, China;3. Survey Engineering Institute, Sichuan Earthquake Administration, Ya'an Sichuan 625000, China;4. First Crust Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China;5. College of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China |
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| Abstract: | The Xianshuihe fault zone is divided into five segments along its strike.Fault activity parameters are estimated by using crossing fault measuring data of short baselines and short leveling at sites along the fault zone.Regional dynamic gravity and GPS velocity fields are calculated by using gravity and GPS observational data of a large area covering the whole fault zone.We use the ant colony algorithm and particle swarm optimization (PSO) based on resulting data above to invert the fault activity parameters of the five fault segments,and the strike-slip component of each segment is taken as the current fault slip rate. Then we analyze the differences between the three types of the current slip rate as well as geological average slip rates of the five segments,taking the strike-slip rate inverted from gravity data as the slip rate of the whole fault zone. Comparing the whole near-field fault rate with the result of short baselines and short leveling,we determine the features of fault segments measured by short baselines and short leveling,and provide the current overall strike-slip rate of the five segments and several branch faults.The resulting slip rates are as follows:① 9.13 mm·a-1 on the Luhuo segment;2.46 mm·a-1 on the west branch fault and 5.84 mm·a-1 on the east branch fault in the Xialatuo area. ② 8.57 mm·a-1 on the Daofu segment;on its southeast section,the west branch in the Goupu is 1.78 mm·a-1,and the east branch is 6.79 mm·a-1.③ 7.67 mm·a-1 on the Qianning segment.④ 6.14 mm·a-1 on the Kangding segment.And ⑤ 4.41 mm·a-1 on the Moxi segment.Moreover,we also discuss qualitatively the 3D elastic-plastic deformation model of active blocks on both sides of the fault zone covered by gravity and GPS data and permanent displacements caused by paleo-and historical earthquakes. |
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| Keywords: | Xianshuihe fault zone Crust deformation measurement Segmentation Inversion calculation Slip rate |
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