【摘要】 利用磁县数字地震台记录到的近震波形资料,采用Aki尾波单次散射模型,计算1830年磁县7.5级大地震震源区50 km范围内的尾波Qc值;经多地震拟合得出在尾波流逝时间为20 s时,Qc=(70.2±29.3)f(0.8054±0.1615);40 s,时Qc=(96.6±25.3)f(0.7772±0.1098)。结果表明,磁县震源区Q0值较低,震区地震波衰减比邢台、唐山震区快;η值表明Qc值对频率的依赖性弱于邢台和唐山震区。更多还原

【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(0.865 4±0.161 5);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.更多还原