安徽地区尾波<i>Q<sub>c</sub></i>值特征研究

安徽地区尾波Q_c值特征研究

摘要: 基于Sato单次散射模型,利用安徽省数字化测震台网2001年以来记录到的M_L≥2.3级地震的波形资料,计算得到了安徽地区不同台站周围地壳介质的尾波Q_c值,发现省内不同地区尾波Q_c值存在着明显的差异,霍山地区尾波Q_c值相对省内其余地区较低,拟合得到了安徽地区尾波Q_c值与频率之间的依赖关系,为Q_c=(104.9±36.4)f^(0.85±0.08)。对安徽霍山地区2009年2—12月的震群序列尾波Q_c值变化特征进行了分析,发现主震前后尾波Q_c值发生显著的变化。

Abstract: Based on digital waveform data of M_L≥2.3 earthquakes recorded by Anhui digital seismic network, the Q_c value of the medium below seismic stations in Anhui area is calculated using the Sato single scattering model.The results show that the Q_c value is inhomogeneous and much lower in Huoshan area.The formula for the relationship between Q_c value and frequency in Anhui area is determined using curve fitting, which is Q_c= (104.9±36.4)f^(0.85±0.08).Particularly, the Q_c value of Huoshan earthquake swarm sequences occurred from February to December of 2009 is calculated and analyzed, which shows significant difference between before and after the main shock.