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本文以首都圈数字地震台网记录的2006年文安地震为例,拓展了基于P波初动波形和区域格林函数库的中小地震震源机制格点搜索方法。通过利用P波初动及随后几个波动周期的波形信息,获取文安5.1级震源机制解。应用示例表明,采用格点搜索方法可以获得较为可靠的中小地震震源机制解,证实了利用P波初至后几个周期的波形信息自动搜索获取中小地震震源机制的可行性。
Taking the 2006 Wen’an earthquake recorded by the Digital Earthquake Network in the Capital Region as an example, this paper expands the grid search method for focal mechanisms of small and medium earthquakes based on the initial waveforms of P waves and the regional Green’s function library. By using the waveform information of the initial and subsequent periods of P wave, the 5.1-magnitude focal mechanism solution is obtained. The application examples show that the lattice point search method can be used to obtain more reliable focal mechanism solutions for small and medium earthquakes, confirming the feasibility of using the waveform information of the first few cycles of P wave to automatically search for the source mechanism of medium and small earthquakes.