Stability of sparse station data inversion for deviatoric moment tensor solution of regional earthquakes
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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9.5deg;，两者较为一致；反演得到这次地震的震源深度为41 km，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．Abstract: Observations from regional seismic network are used in studying deviatoric moment tensor for the MW5.4 earthquake of 26 Febuary2010 inTaiwanadjacent area. The smallest rotation angle defined by Kagan (1991) between our result and the Havard GCMT solution is 9.5deg;, and the focal depth we determined is41 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 deviatoric 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 3-components stations may result in relatively reliable solution.
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期刊类型引用(4)
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