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. DOI: 10.13203/j.whugis20160040
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. DOI: 10.13203/j.whugis20160040
XU Caijung, ZHOU Lixuan, YIN Zhi. Construction and Geodesy Slip Inversion Analysis of 2013 Ms 7.0 Lushan in China Earthquake's Curved Fault Model[J]. Geomatics and Information Science of Wuhan University, 2017, 42(11): 1665-1672. DOI: 10.13203/j.whugis20160040
Citation: XU Caijung, ZHOU Lixuan, YIN Zhi. Construction and Geodesy Slip Inversion Analysis of 2013 Ms 7.0 Lushan in China Earthquake's Curved Fault Model[J]. Geomatics and Information Science of Wuhan University, 2017, 42(11): 1665-1672. DOI: 10.13203/j.whugis20160040

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

Construction and Geodesy Slip Inversion Analysis of 2013 Ms 7.0 Lushan in China Earthquake's Curved Fault Model

  • 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。

     

    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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