尾波Q_c值随时间变化在地震预测中应用的研究

Research of temporal change of Coda Q_c applied in earthquake prediction

利用云南地区22个区域数字地震台站记录到的,自1999年下半年至2004年下半年的1 403条数字地震波形资料,采用Sato单次散射模型,计算了各台站周围50 km内的尾波Qc值;并给出了其中14个资料相对较为丰富的台站的尾波Qc值随时间变化结果。依据这14个台的3 Hz、10 Hz、18 Hz频率点的2002年1月1日前后平均Qc值的变化,研究认为在未来几年内,云南地区比较危险的区域可能位于滇中块体的东南边界附近、滇中块体的西南部及其西边界附近。

The coda-wave attenuation quality factor Qc values in the periphery areas of seismic stations in Yunnan Province were estimated using the single-scattering attenuation model of Sato from 1403 local seismic events recorded by a regional network of 22 digital stations from the latter half of 1999 to the latter half of 2004. And temporal changes of coda Qc of 14 stations with relative richer data were given out. Based on the temporal changes of average coda Qc at 3 Hz, 10 Hz, and 18 Hz at these 14 stations around January 1, 2002, the risky areas were predicted in the vicinity of the southeastern boundary and the southwestern as well as the western boundary of Dianzhong Active-tectonic Block.