体波谱振幅相关系数法在肥东地震序列震后判定中的应用

The application of correlation coefficient of body-wave spectral amplitudes in the tendency determination after the Feidong earthquake sequence

地震直达体波记录的观测谱包含震源、传播路径和台站信息,而发生在同一震源区的不同地震,如:序列地震,在同一地震台站的记录,受传播路径影响基本相同,地震台站的场地响应、仪器响应也完全相同。因此,序列地震体波观测零频谱的相关系数直接反映震源辐射图型因子的相似性,即震源机制解的相似性。将该方法用于2009年安徽肥东地震序列,与传统方法计算的震源机制解作比较,结果显示,谱振幅相关系数法能反映序列地震震源机制解的变化过程。

The observation spectrum of direct wave seismogram contains seismic source, propagation path and station information. When many events occur within a same focal region, such as the earthquake of a earthquake sequence and the seismic o{ a station, due to the influence of propagation path and the response of the site and instrument of the station are basically iden- tical, therefore the correlation coefficient of the observed spectrum directly reflects the simi- larity of radiation pattern factors of seismic source, namely, the similarity of focal mecha- nism solutions. According to this principle, this method is used in the Feidong earthquake sequence, and results are compared with the focal mechanism solutions which calculated by the traditional method. The results showed that correlation coefficient of body-wave spectral amplitudes can reflect the change process of focal mechanism solutions of earthquake sequence.