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
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摘要
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 of a station,due to the influence of propagation path and the response of the site and instrument of the station are basically identical, therefore the correlation coefficient of the observed spectrum directly reflects the similarity of radiation pattern factors of seismic source,namely,the similarity of focal mechanism 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.
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 of a station,due to the influence of propagation path and the response of the site and instrument of the station are basically identical, therefore the correlation coefficient of the observed spectrum directly reflects the similarity of radiation pattern factors of seismic source,namely,the similarity of focal mechanism 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.
引文
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梁尚鸿,李幼铭,等.利用区域地震台网P、S振幅比资料测定小震震源参数[J].地球物理学报,1984,27(3) :249 256．
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吴大铭,王培德,等.用SH波和P波振幅比确定震源机制解[J].地震学报,1989,11(3) :275 278．
许忠淮,汪素云,等.由多个小震推断的青甘和川滇地区地壳应力场的方向特征[J].地球物理学报,1987,30(5) :476-486．
许忠淮,阎明,等.由多个小地震推断的华北地区构造应力场的方向[J].地震学报,1983,5(3) :268-279．
朱航,刘杰,等.采用体波谱振幅相关系数方法研究地震序列的震源机制变化过程[J].地震,2006,26(2) :1-11．
朱航,龙锋.单台振幅比方法在马尔康Ms 4． 7地震序列判断中的应用[J].地震地磁观测与研究,2005,26(4) :29 35．
Lund B,Boovarsson R. Correlation of Microearthquake Body-Wave Spectral Amplitudes[J]. Bull Seism Soc Amer,2002,92: 2419-2433．
Snoke J A. Earthquake mechanism//James DE,Encyclopedia of Geophysics[M]. New York:Van Nostrand Reinhold Company. 1989:239-245．
冯德益.近地震S、P波振幅比异常与地震预报[J].地球物理学报,1974,17(3) :73-78．
国家地震局监测预防司.测震学分析预报方法[M].北京:地震出版社,1997:131 136．
华祥文.唐山强震前后北京、天津周蟊地区应力的变化过程[J].地震学报,1980,2(2) :130 146．
梁尚鸿,李幼铭,等.利用区域地震台网P、S振幅比资料测定小震震源参数[J].地球物理学报,1984,27(3) :249 256．
刘杰,郑斯华,等.利用P波和S波的初动和振幅比计算中小地震的震源机制解[J].地震,2004,24(1) :19-26．
吴大铭,王培德,等.用SH波和P波振幅比确定震源机制解[J].地震学报,1989,11(3) :275 278．
许忠淮,汪素云,等.由多个小震推断的青甘和川滇地区地壳应力场的方向特征[J].地球物理学报,1987,30(5) :476-486．
许忠淮,阎明,等.由多个小地震推断的华北地区构造应力场的方向[J].地震学报,1983,5(3) :268-279．
朱航,刘杰,等.采用体波谱振幅相关系数方法研究地震序列的震源机制变化过程[J].地震,2006,26(2) :1-11．
朱航,龙锋.单台振幅比方法在马尔康Ms 4． 7地震序列判断中的应用[J].地震地磁观测与研究,2005,26(4) :29 35．
Lund B,Boovarsson R. Correlation of Microearthquake Body-Wave Spectral Amplitudes[J]. Bull Seism Soc Amer,2002,92: 2419-2433．
Snoke J A. Earthquake mechanism//James DE,Encyclopedia of Geophysics[M]. New York:Van Nostrand Reinhold Company. 1989:239-245．
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