一种三分向地震台站慢度方位角校正方法的实现
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摘要
方位角和慢度是表征地震信号的两个关键参数,在地震信号的识别、震相的关联和地震定位等多个方面都起着十分重要作用。三分向地震台站常用Jurkevics提出的偏振算法估计信号的慢度与方位角,在实际运行中,台站的方位角和慢度会出现一定的系统偏差。对此,文章提出了一种分层校正三分向地震台站方位角、慢度的方法,该方法根据每个三分向地震台站得出的慢度、方位角残差统计,首先校正全局的慢度、方位角估计,然后,在预定义的方位角和慢度格点空间调整校正。测试显示了台站慢度和方位角估计性能的提高。
Azimuth and slowness are the key attributes for identifying phase,associating them with events,and estimating the location of events.Polarization analysis based on the method of Jurkevics is used to determine azimuth and slowness of signals detected in three-component data.There are systematic biases of azimuth and slowness of those stations in the practical operation.To solve the problem,this paper presents a method of hierarchy slowness-azimuth station corrections for three-component seismic stations.It firstly corrects the global systematic biases in the slowness estimation,derived from statistical analysis of residuals at each station.Then it fine-tunes corrections in predefined small bins of slowness and azimuth.The testing with new corrections show improvement of slowness and azimuth estimation.
Azimuth and slowness are the key attributes for identifying phase,associating them with events,and estimating the location of events.Polarization analysis based on the method of Jurkevics is used to determine azimuth and slowness of signals detected in three-component data.There are systematic biases of azimuth and slowness of those stations in the practical operation.To solve the problem,this paper presents a method of hierarchy slowness-azimuth station corrections for three-component seismic stations.It firstly corrects the global systematic biases in the slowness estimation,derived from statistical analysis of residuals at each station.Then it fine-tunes corrections in predefined small bins of slowness and azimuth.The testing with new corrections show improvement of slowness and azimuth estimation.
引文
[1]Jurkevics,A.Polarization Analysis of Three-Com-ponent Array Data[J].Bulletin of the SeismologicalSociety of America,1988,78:1725-1743.
[2]Bullen,K.E.An Introduction to the Theory ofSeismology[D].Cambridge University press,Lon-don,1963:128-130.
[3]Bondar,I.,R.G.North,and G.Beall.Teleseis-mic slowness-azimuth station corrections for theInternational Monitoring System Seismic Network[J].Bull.Seism.Soc.Am.,1999,89:989-1003.
[2]Bullen,K.E.An Introduction to the Theory ofSeismology[D].Cambridge University press,Lon-don,1963:128-130.
[3]Bondar,I.,R.G.North,and G.Beall.Teleseis-mic slowness-azimuth station corrections for theInternational Monitoring System Seismic Network[J].Bull.Seism.Soc.Am.,1999,89:989-1003.
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