基于Aki、Sato模型的阿克陶M_S6.7地震尾波Q值特征研究

QCCODA WAVES CHARACTERESTICS OF AKETAO EARTHQUAKE WITH M_S6.7 BASED ON AKI AND SATO MODEL

利用新疆地震台网吉根单台所记录的阿克陶M_S6.7地震发生前后的数字地震波形资料,采用Aki、Sato等两种单次散射模型,系统地研究了该次地震序列尾波Q值随时间的变化,分析了尾波Q值在强震前后的变化特征。两种模型拟合Q_C与对应频率之间的关系表达式为Q_C=110.5±35.37f1.192±0.235,Q_C=60.85±14.78f0.975±0.088,阿克陶地震序列计算得到Aki和Sato模型的Q_C值都相对较低,该地区是以高η值、低Q_C为特征的构造活跃区。根据2012年1月至2017年1月吉根台记录的数字波形尾波Q值时序进程特征表明,地震序列前的Q_C值的变化特征为上升—下降—持续—发震的趋势。

With digital seismic waveform data recorded by Jigen seismic station before and after Aketao earthquake with Ms6.7, using Aki and Sato single scattering models, it systematically studied earthquake sequence of coda Qc value with time, and analyzed characteristics of Qc value before and after strong motion. The relationship between the fitting of Qc and corresponding frequency of two models were Qc = 110. 5 ± 35.37f 1.192 ±0. 235, Qc = 60. 85 ± 14. 78f 0.975 ±0.088 Qc value of Aketao earthquake sequence calculated by Aki and Sato model was relatively low, the area was in high value of rl, active tectonic characteristics of low Qc. Jigen station recorded digital waveform coda Qc value in chronological order from January 2012 to January 2017, and it indicated that variation of Qc value before earthquake sequence went to up -down -continued -earthquake trend.