唐山地区尾波Q<sub>c</sub>值研究

唐山地区尾波Q_c值研究

摘要: 利用首都圈地震数字台网资料,计算了唐山地区不同尾波窗长的Q_c值。尾波窗长为15~30s时,Q_c(f)=53f^1.1;尾波窗长为30~60s时,Q_c(f)=256f^0.8;尾波窗长为60~90s时,Q_c(f)=304f^0.72;尾波窗长为90~120s时,Q_c(f)=240^0.68。可以看出,同一地点的Q₀值随尾波窗长的增加而增大,但尾波窗长为90~120s时,Q₀反而减小。

Abstract: The Q_C values of different coda in Tangshan region are calculated with the data recorded by digital seismic network in Capital area.The results show that,when the length of coda window is at 15~30 seconds,Q_C(f)=53f^1.1;when the length of coda window is at 30~60 seconds,Q_C(f)=256f^0.8;when the length of coda window is at 60~90 seconds;Q_C(f)=304f^0.72,when the length of coda window is at 90~120 seconds Q_C(f)=240f^0.68.It is concluded that Q₀ increases with the length of coda window,but reduces when the length is 90~120 seconds.