基于KiK-net数据的偏振分析方法计算震中方位角影响因素分析
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摘要
基于日本KiK-net强震动观测记录,以提高计算震中方位角的准确性为目标,研究记录参量(加速度、速度、位移)、计算时间窗和滤波频带对偏振分析方法计算震中方位角结果的影响。结果表明,在该研究的地震数据条件下,采用位移记录、计算时间窗为1s、滤波频带取0.1～20Hz时,可以获得最佳的震中方位角计算结果,震中方位角的计算偏差为45°时所占比例为88%。
In this paper,three main factors which directly influence the precision of determining the epicentral azimuth,namely ground-motion type,time window length and filter band,are analyzed by the polarization analysis method,based on part of KiK-net strong motion data.Results show that azimuth determined by ground displacement is outstanding compared to that determined by ground acceleration and ground velocity.Meanwhile,with calculation-time window to be valued around 1sand filtering band to be valued between 0.1-20 Hz makes the epicentral azimuth determination results best.The results of 45-degree deviation percentage can be 88%.
In this paper,three main factors which directly influence the precision of determining the epicentral azimuth,namely ground-motion type,time window length and filter band,are analyzed by the polarization analysis method,based on part of KiK-net strong motion data.Results show that azimuth determined by ground displacement is outstanding compared to that determined by ground acceleration and ground velocity.Meanwhile,with calculation-time window to be valued around 1sand filtering band to be valued between 0.1-20 Hz makes the epicentral azimuth determination results best.The results of 45-degree deviation percentage can be 88%.
引文
[1]范涛.数字滤波与偏振分析在强震动数据处理中的应用[D].哈尔滨:中国地震局工程力学研究所,2014(Fan Tao.Digital Filter and Polarization Analysis’s Application of Data Processing of Strong Motion Records[D].Harbin:Institute of Engineering Mechanics,CEA,2014)
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[3]宋晋东.高速铁路运行控制用地震动参数及单台地震预警技术研究[D].哈尔滨:中国地震局工程力学研究所,2013(Song Jindong.Research on Seismic Ground Motion Indices for Operation Control and Single Station Earthquake Early Warning Applied for High-Speed Railway[D].Harbin:Institute of Engineering Mechanics,CEA,2013)
[4] Flinn E.Signal Analysis Using Rectilinearity and Direction of Particle Motion[J].Proceedings of the IEEE,1965,53(12):1 874-1 876
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[7]马强.地震预警技术研究及应用[D].哈尔滨:中国地震局工程力学研究所,2008(Ma Qiang.Study and Application on Earthquake Early Warning[D].Harbin:Institute of Engineering Mechanics,CEA,2008)
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[9]马亮.用于地震预警的单台定位技术研究[D].哈尔滨:中国地震局工程力学研究所,2013(Ma Liang.Research on Earthquake Location Using Single Station for Earthquake Early Warning[D].Harbin:Institute of Engineering Mechanics,CEA,2013)
[10]杜玉静.三分量地震极化滤波[D].西安:长安大学,2010(Du Yujing.Polarization Filter for Three-Component Seismic Data[D].Xi’an:Chang’an University,2010)
[11]肖梅.三分量地震极化滤波与波场分离方法研究[D].西安:长安大学,2005(Xiao Mei.Three-Component Seismic’s Wave Polarization Analysis and Wavefield Separation[D].Xi’an:Chang’an University,2010)
[12]Jurkevics A.Polarization Analysis of Three-Component Array Data[J].Bulletin of the Seismological Society of America,1988,78(5):1 725-1 743
[13]李铜基.极化滤波[J].海洋技术,1996,15(4):130-137(Li Tongji.Polarization Analysis[J].Ocean Technology,1996,15(4):130-137)
[14]Reading A M,Mao W,Gubbins D.Polarization Filtering for Automatic Picking of Seismic Data and Improved Converted Phase Detection[J].Geophysical Journal International,2001,147(1):227-234
[15]林建民,杨微,陈蒙,等.偏振分析法在地震信号检测中的应用[J].中国地震,2012,28(2):133-143(Lin Jianmin,Yang Wei,Chen Meng,et al.The Application of Polarization Analysis in Seismic Signaldetection[J].Earthquake Research in China,2012,28(2):133-143)
[2]宋晋东,李山有,马强.日本新干线地震监测与预警系统[J].世界地震工程,2012,28(4):1-10(Song Jindong,Li Shanyou,Ma Qiang.Overview on Earthquake Monitoring and Early Warning System for High-Speed Railway(Shinkansen)in Japan[J]. World Earthquake Engineering,2012,28(4):1-10)
[3]宋晋东.高速铁路运行控制用地震动参数及单台地震预警技术研究[D].哈尔滨:中国地震局工程力学研究所,2013(Song Jindong.Research on Seismic Ground Motion Indices for Operation Control and Single Station Earthquake Early Warning Applied for High-Speed Railway[D].Harbin:Institute of Engineering Mechanics,CEA,2013)
[4] Flinn E.Signal Analysis Using Rectilinearity and Direction of Particle Motion[J].Proceedings of the IEEE,1965,53(12):1 874-1 876
[5] Lockman A B, Allen R M.Single-Station Earthquake Characterization for Early Warning[J].Bulletin of the Seismological Society of America,2005,95(6):2 029-2 039
[6]周彦文.基于单台P波记录的早期地震预警方法研究[D].兰州:中国地震局兰州地震研究所,2008(Zhou Yanwen.Study on the Early Warning System Method Based on a Single Station’s P Wave Record[D].Lanzhou:Lanzhou Institute of Seismology,CEA,2008)
[7]马强.地震预警技术研究及应用[D].哈尔滨:中国地震局工程力学研究所,2008(Ma Qiang.Study and Application on Earthquake Early Warning[D].Harbin:Institute of Engineering Mechanics,CEA,2008)
[8] Noda S,Yamamoto S,Sato S.New Method for Estimating Earthquake Parameters for Earthquake Early Warning[J].QR of RTRI,2012,53(2):102-106
[9]马亮.用于地震预警的单台定位技术研究[D].哈尔滨:中国地震局工程力学研究所,2013(Ma Liang.Research on Earthquake Location Using Single Station for Earthquake Early Warning[D].Harbin:Institute of Engineering Mechanics,CEA,2013)
[10]杜玉静.三分量地震极化滤波[D].西安:长安大学,2010(Du Yujing.Polarization Filter for Three-Component Seismic Data[D].Xi’an:Chang’an University,2010)
[11]肖梅.三分量地震极化滤波与波场分离方法研究[D].西安:长安大学,2005(Xiao Mei.Three-Component Seismic’s Wave Polarization Analysis and Wavefield Separation[D].Xi’an:Chang’an University,2010)
[12]Jurkevics A.Polarization Analysis of Three-Component Array Data[J].Bulletin of the Seismological Society of America,1988,78(5):1 725-1 743
[13]李铜基.极化滤波[J].海洋技术,1996,15(4):130-137(Li Tongji.Polarization Analysis[J].Ocean Technology,1996,15(4):130-137)
[14]Reading A M,Mao W,Gubbins D.Polarization Filtering for Automatic Picking of Seismic Data and Improved Converted Phase Detection[J].Geophysical Journal International,2001,147(1):227-234
[15]林建民,杨微,陈蒙,等.偏振分析法在地震信号检测中的应用[J].中国地震,2012,28(2):133-143(Lin Jianmin,Yang Wei,Chen Meng,et al.The Application of Polarization Analysis in Seismic Signaldetection[J].Earthquake Research in China,2012,28(2):133-143)