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针对2008年1月至2011年12月发生在新疆北天山西段的地震事件,分析新源、温泉和巴仑台3个台站记录到的波形资料,采取尾波归一化方法,计算出P、S波在多个频率点f的衰减系数Q-1P、Q-1S,利用最小二乘法拟合得到Q-1=Q0fη,得到该区域P波衰减系数和S波衰减系数。结果表明,新源研究区关于P波、S波的衰减指数为-0.982 1、-0.978 1;温泉研究区关于P波、S波的衰减指数为-1.049 7、-0.773 8;巴仑台研究区关于P波、S波的衰减指数为-0.870 0、-0.956 8。与中国云南地区关于P波、S波衰减结果相比,新源研究区域与云南的禄劝研究区地下介质衰减特性比较一致。
According to the seismic events that occurred in the western section of North Tianshan from January 2008 to December 2011, the waveform data recorded by the three stations of Xinyuan, Hot Spring and Balintai were analyzed and the tail wave normalization method was used to calculate P and S wave attenuation coefficients Q-1P, Q-1S at multiple frequency points f, and Q-1 = Q0fη are obtained by least-squares fitting to obtain the P-wave attenuation coefficient and S-wave attenuation coefficient in this region. The results show that the attenuation index of P wave and S wave in the research area of Xinyuan is -0.982 1 and -0.978 1 respectively; the attenuation index of P wave and S wave in hot spring research area is -1.049 7 and -0.773 8; The attenuation index of the S wave in the region about P wave is -0.870 0, -0.956 8. Compared with the attenuation results of P-wave and S-wave in Yunnan region of China, the decay characteristics of the underground medium in the new source study area and the Luquan study area in Yunnan are similar.