Abstract:
Based on digital waveform data of local earthquakes,using coda Aki single scattering model the coda
Qc value of stations around 50 km in 1830 CiXian,
M7.5 earthquake region are calculated through seismic casualties fitting.The result indicate that when lapse time is 20 s,the coda
Qc is:
Qc=(70.2±29.3)
f(0.8054±0.1615);when the lapse is 40 s,the coda
Qc is:
Qc=(96.6±25.3)
f(0.777 2±0.109 8).The results show that
Qc value of coda is lower and the attenuation of seismic waves in Cixian'seismic area are faster than that in Xingtai,Tangshan Earthquake area;η values show that the dependence of
Qc value to frequency is weaker than that in the Xingtai and Tangshan earthquake area.