稀疏台网反演区域地震偏量矩张量解的稳定性  

Stability of sparse station data inversion for deviatoric moment tensor solution of regional earthquakes

作　　者：郑建常[1,2] 陈运泰[1] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081 [2]山东省地震局,中国济南250014

出　　处：《地震学报》2012年第1期31-43,共13页Acta Seismologica Sinica

基　　金：中国地震局地震行业科研专项(200808068);中国地震局监测预报司震情跟踪定向工作任务(201002220102);山东省地震局重点科研项目(JJ1103y);博士基金项目(10B05)联合资助

摘　　要：使用区域地震台网的波形资料,研究了2010年2月26日台湾以东海域MW5.4地震的偏量矩张量,所得结果与Havard CMT目录给出的解之间的Kagan角为9.5°,两者较为一致;反演得到这次地震的震源深度为41km,接近USGS给出的定位结果,可能更接近真实的震源深度.选择不同的台站组合,分析了台站布局对矩张量解的影响.结果显示,3个台站的组合基本上都可以较为准确地得到矩张量解,台站方位覆盖越好,反演得到的解的偏差越小;在合适的情况下,两个台站的组合也可以得到较为可靠的解.Observations from regional seismic network are used m stuctymg tacw atoric moment tensor for the Mw5.4 earthquake of 26 Febuary 2010 in Taiwan adiacent area. The smallest rotation angle defined by I4agan （1991） between our result and the Havard GCMT solution is 9. 5°, and the focal depth we determined is 41 km, which is close to USGS location result and possibly closer to the real source. The paper also discusses the effect of station distribution on de- viatoric moment tensor inversion by selecting different station combinations. The result shows that, for the data sets from three 3-component stations, the solutions are mostly accurate. The better station coverage, the less departure from real solutions. In appropriate case, the data set from two S-components stations may result in relatively reliable solution.

关 键 词：偏量矩张量 稀疏台网 离散波数法 波形反演 

分 类 号：P315.33[天文地球—地震学]