滦县地区尾波Q值及其与频率关系的研究  

A STUDY OF THE CODA Q-VALUE AND ITS RELATIONSHIP WITH FREQUENCY OF THE LUANXIAN DISTRICT

作　　者：李松林[1] 樊计昌[1] 惠乃玲 杨健[1] 孙桂香[1] 

机构地区：[1]国家地震局地球物理勘探大队

出　　处：《地震学报》1990年第4期357-366,463,共10页Acta Seismologica Sinica

基　　金：地震科学联合基金

摘　　要：利用国家地震局地球物理勘探大队在滦县地震区取得的高精度的数字化地震记录资料,由尾波分析法计算了对应于7个不同频率(f=1.5,3.0,6.0,10.0,15.0,20.0,25.0Hz)的介质Q_c值.发现在该频率范围内Q_c随频率的变化近似服从幂函数关系Q_c=af^b.对流逝时间较短(40 s左右)的尾波资料,求得a=46,b=0.85.对流逝时间较长(60 s左右)的资料,a=72,b=0.90.b值较大,表明Q_c值对于频率的强依赖关系,a值(1Hz的Q_c值)较小.这些结果表明该地区为一较强的构造活动区.Through processing the data of digital seismic records with high precision collected in the Luanxian Region,the Qc values of the medium corresponding to seven different frequencies (f=1.5,3.0,6.0,10.0,15.0,20.0,25.0 Hz) have been obtained by using the coda wave analysis method. It is found that the Qc value versus frequency can be approximated by the relation We have obtained a= 46,b=0.85 for shorter lapse time and a= 72,b=0.90 for longer. The large values of b show the strong dependence of Qc on frequency. The value of a (for Qc at 1 Hz) is quite small. These results indicate that Luanxian is a region with strong' tectonic motion.

关 键 词：尾波 Q值 地震波 频率 衰减 关系 

分 类 号：P315.3[天文地球—地震学]