利用Sato模型研究邢台震区尾波Q_C值特征

Using the Sato Model to Study Characteristics of S-code Qc Value in Xingtai Seismic Region

摘要:

利用Sato单次散射模型和红山台的近场数字地震记录研究了邢台震区尾波QC值的变化特征,得到QC值随频率的变化关系:即窗长为15~30 s时QC=(42.9±20.7)f(0.98±0.13);窗长为40~60 s时QC=(103.1±27.9)f(0.85±0.08)。通过分析不同频率点随时间的变化曲线,发现2002年4月22日邢台隆尧5.0级地震前高频部分QC值出现"升高—降低—再升高—发震"的发震模式,对预测邢台地区的中强震的发生有一定的参考意义。还发现相对Aki模型而言Sato模型更适合邢台震区的尾波计算和分析。

Abstract:

Using the Sato single isotropie scattering model and the near-field digital seismic records from Hongshan seismostation in Hebei province, the variation characteristics of S-code Qc value in Xingtai seismic region are studied. The relationship between the Qc value and frequency is ob- tained： while the length of windows are 15-30 s, Qc= （42.9±20.7）f^（0.98±0.13） ,and while the length of windows are 40 - 60 s, Qc = （ 103.1±27.9 ） f^（0.85±0.08）. Through analyzing the variation curves of Qc along with time in different frequency point, it is found that before Longyao Mt. 5.0 earthquake on April 22, 2002, in Xingtai seismic region, the high-frequency part of Qc value changed as ＂increasing→reducing→re-elevating→shocking＂ pattern, and this pattern has certain referent significance for moderate-strong earthquake prediction in Xingtai area. It is also found in the research that comparing with Aki model, the Sato model is better for the S-code computation and analysis in Xingtai seismic region.