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 Q
0 increases with the length of coda window,but reduces when the length is 90~120 seconds.