多种岩石的Qp、Qs、Qc  

QP,QS AND QC OF VARIED ROCKS

作　　者：许昭永[1] 段永康[1] 王杉[1] 赵晋明[1] 胡毅力[1] 华培中 

机构地区：[1]云南省地震局,云南大学地球科学系

出　　处：《地震研究》1996年第2期192-198,共7页Journal of Seismological Research

摘　　要：本文采用脉冲传播谱振幅比法、能量法、尾波法分别测多种岩样的Ｐ波Ｑ值、Ｓ波Ｑ值及尾波Ｑ值。结果表明，能量法所得Ｑｐ、Ｑｓ较小。谱振幅比法所得Ｑｐ一般居中，Ｑｓ较大。尾波Ｑｃ有的偏大，有的偏小。谱振幅比法及尾波法都表明，不同岩石的振幅谱不同，主频不同。尾波Ｑｃ值与（岩石）尾波振幅谱特征及峰值频率有关。对于宽带谱，大于峰值频率时Ｑｃ随频率增大而减小，小于峰值频率时Ｑｃ随频率减小而减小。对于窄带谱，与主频相应的Ｑｃ最小。Q values of P,S and coda of varied rocks have been measured by methods of amplitude ratio,energy, and coda from pulse propagational spectra. The results show that Qp and Qs measured by energy method are smaller, Qp by spectral amplitude ratio are usually in middle, Qs are bigger, some of Qc measured by coda are bigger and some are smaller.Methods of spectral amplitude ratio and coda all indicate that different amplitude spectra for different rocks have different major frequencies.Qc values of coda are related to features of coda amplitude spectra and peak frequencies. Qc greater than peak frequency is decreasing with the frequancy increase for the broad band spectra,Qc less than peak frequency is decreasing with frequency decrease for the narrow band frequency. Qc corresponding to the major frequency is minimum for the narrow band spectra.

关 键 词：岩石 Q值 岩样 谱振幅比 

分 类 号：P585.1[天文地球—岩石学]