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由CDSN数据测定IPz分量谱震级初探
引用本文:陈海通,吴建平.由CDSN数据测定IPz分量谱震级初探[J].地震地磁观测与研究,1994,15(6):43-49.
作者姓名:陈海通  吴建平
作者单位:国家地震局地球物理研究所
摘    要:本文尝试用CDsN的IPz分量强震记录来测定谱震级。通过对测出的谱震级m_(T)与体波震级m_(B)、m_(b)的相关分析,得出其反映震源特性的峰值,出现在周期T=1秒左右。此外,谱震级还有随周期而变化的特性。根据谱震级与能量的关系,推导了它的通用形式为am_(T)=log(E/E0)(式中a=2,logE_0=5.6)。它的最高震级为9.6级。运用谱震级的通用形式对本文测定的4个谱震级进行检验,结果表明它比传统方法测定的IPz分量体波震级m_(B)系统偏小0.31级。因谱震级是扣除了介质滞弹性吸收影响后的产物,故这种偏差是比较合理的。

关 键 词:谱震级  介质滞弹性  周期变量  地震  CDSN

Preliminary research on IPz component spectral magnitude de-termined by data of CDSN
Chen Haitong,Wu Jianping and Sun Cichang.Preliminary research on IPz component spectral magnitude de-termined by data of CDSN[J].Seismological and Geomagnetic Observation and Research,1994,15(6):43-49.
Authors:Chen Haitong  Wu Jianping and Sun Cichang
Abstract:This paper tries to determine the spectral magnitude by use of records of the IP ver-tical component of CDSN. Through relative analysis of the measured spectral magnitudem_(T) and body wave magnitude m_(B) and_(b),the peak of m_(T) reflects the source charac-teristics and it appears at the period T=about l second.In addition,the spectral magni-tude possesses the characteristics changing with the period.According to the relation be-tween spectral magnitude and energy,the authors deduce that its general form is am_(T)=log(E/E_0)(a=2,logE_0=5.6 in the formula)and its grade system is m_(T) max=magni-tude 9.6(if using the general boy-wave magnitude system,the magnitude will be slight-ly lower 0.31).As the spectral magnitude is the product which has been deducted the ef-fect of the medium anelasticity absorption,this deviation is more reasonable.
Keywords:spectral magnitude  medium anelasticity  periodic variable  high-grade system
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