由CDSN数据测定IPz分量谱震级初探  

Preliminary research on IPz component spectral magnitude de-termined by data of CDSN

作　　者：陈海通[1] 吴建平[1] 孙次昌[1] 

机构地区：[1]国家地震局地球物理研究所

出　　处：《地震地磁观测与研究》1994年第6期43-49,共7页Seismological and Geomagnetic Observation and Research

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。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.

关 键 词：谱震级 介质滞弹性 周期变量 地震 CDSN 

分 类 号：P315.9[天文地球—地震学]