| 2013年Ms 7.0级中国芦山地震断层曲面模型的构建及其滑动分布的大地测量反演 |
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| 引用本文： | 许才军,周力璇,尹智.2013年Ms 7.0级中国芦山地震断层曲面模型的构建及其滑动分布的大地测量反演[J].武汉大学学报(信息科学版),2017,42(11):1665-1672. |
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| 作者姓名： | 许才军 周力璇 尹智 |
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| 作者单位： | 1.武汉大学测绘学院, 湖北 武汉, 430079 |
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| 基金项目： | 国家自然科学基金41431069国家自然科学基金41274030国家973计划2013CB733303 |
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| 摘 要： | 根据中国芦山地震的余震序列分布和地质构造情况，联合GPS同震位移和水准测量数据，采用格网搜索法和方差分量估计（variance covariance component，VCE）方法建立了芦山地震的断层曲面模型。以建立的断层曲面模型为基础进行滑动分布反演，反演结果表明此次地震以明显的逆冲滑动为主，存在左旋趋势，断层的滑动主要发生在4.56~18.25 km深度范围内，最大滑动量为0.70 m，在深度12.64 km附近，释放的能量为8.77×1018 N/m（相当于Mw 6.57级）。对曲面模型进行棋盘检验，结果表明其能够较好地分辨出断层深度浅于13 km的凹凸体，其面积最小为8 km×8 km。
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| 关 键 词： | 2013年Ms 7.0级中国芦山地震 GPS 水准测量 断层曲面模型 棋盘检验 |
| 收稿时间： | 2016-06-23 |
Construction and Geodesy Slip Inversion Analysis of 2013 Ms 7.0 Lushan in China Earthquake's Curved Fault Model |
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| Affiliation: | 1.School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China2.Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan 430079, China3.Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China |
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| Abstract: | Based on the distribution of aftershock sequences and the geology of Lushan, using the GPS and level measurement coseismal displacement data near the Lushan Earthquake, we constructed a curved fault model of the 2013 Ms 7.0 Lushan earthquake using the grid search and variance component estimation method. We executed a fault slip distribution inversion based on this curved fault model. The result shows that the fault is mainly a thrust fault with a sinistral trend. The earthquake occurred at 4.56~18.25 km in depth, the maximum slip was 0.70 m at the 12.64 km depth, and the corresponding seismic moment release was 8.77×1018N/m, equivalent to a Mw 6.57 earthquake. Based on a check board test of the curved fault model, we can distinguish an asperity shallower than 13 km in the fault depth, with a minimum area of 8 km×8 km. |
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