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2008年汶川MS 8.0地震后GPS资料反映的龙门山断裂带南段地壳水平变形动态特征分析
熊小慧1,2) 江在森2) 武艳强3) 王启欣4) 李胜乐1)
1)中国地震局地震研究所,武汉 430071;2)中国地震局地震预测研究所,北京 100036;3)中国地震局第一监测中心,天津300180;4)中国地震局地质研究所,北京 100029
摘要:
本文对龙门山断裂带南段GPS位移时间序列进行了欧拉基准转换、最小二乘配置插值和滤波分析等数据后处理,并利用块体刚性一弹塑性运动一应变模型计算了龙门山南段各区域应变参数时间序列。结合各站点位移时间序列、速度场及各区域应变参数序列,分析发现2008年汶川M 8.0地震对龙门山南段的影响由西北至东南由大变小,引起最大变形速度达背景速度6倍,增强了隐伏断层对两侧地表影响的差异,使南段的地震危险性由北至南增加。根据龙门山南段的历史地震及构造背景,对各区域地震危险性进行了比较,发现东南侧危险性最大,历史应变的积累及汶川地震的加速影响导致了芦山地震的提前发生和破裂断层的左旋错动。汶川地震对较远的鲜水河断裂南段也有持续两年的应力微释放影响,但其远不及川滇块体的应力压缩作用。
关键词:  地壳形变  龙门山断裂带南段  汶川地震  GPS时间序列  最小二乘配置  芦山地震
DOI:
分类号:
基金项目:
Characteristics of Crustal Horizontal Deformation in the South Segment of Longmenshan Fault Zone Revealed by GPS Data after the Wenchuan Earthquake
Xiong Xiaohui1,2),Jiang Zaisen2),Wu Yanqiang3),Wang Qixin4) and Li Shengle1)
1)Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,Wuhan 430071,China/2)Institute of Earthquake Science,CEA,Beijing 100036,China/3)First Crust Deformation Monitoring and Application Center,CEA,Tianjin 300180,China/4)Institute of Geology,CEA,Beijing 100029,China
Abstract:
In order to obtain deformation parameters in the south segment of Longmenshan fault zone,Euler datum transformation and the least square collocation for data interpolation and smoothing are used to process GPS displacement time series data in the south segment of Longmenshan fault zone,and the rigid and elastic-plastic block motion model is used to calculate the strain parameters in each subarea. Conjoint analysis of displacement, velocity of each station and strain parameters of each subarea reveals that the influence of the Wenchuan earthquake on the south segment of Longmenshan fault zone increases from southeast to northwest,causing a highest deformation rate 6 times the background value and heightening the influence of the hidden faults on the difference of the earth surface along its two sides,which leads to the seismic risk of the southern segment increasing from north to south. The comparison of seismic risk among subareas based on the tectonic and seismicity background indicates that the most dangerous area is on the southeast of Longmenshan faults,and the background strain accumulation and the promoting effect of the Wenchuan earthquake advanced the occurrence of Lushan earthquake and the sinistral strike-slip on the rupture plane. The Wenchuan earthquake also caused a slight two-year long continuous strain release in the south segment of Xianshuihe fault,but the influence is far less than the effect of the compressive strain caused by the Sichuan-Yunnan block.
Key words:  South segment of Longmenshan fault zone the Wenchuan earthquake  GPS time series  The Least Square Collocation  Euler transform  Strain parameters  Lushan earthquake