基于sato模型的山西北部地区尾波Q值研究

Study on Q Value of Coda Wave in North of Shanxi Based on Sato Model

依据sato单次散射模型,对山西北部(北纬380～410)2001年至2011年13个数字遥测子台记录的地震波形资料进行计算和分析。拟合尾波窗长40 s时尾波Q值对频率的依赖关系,得到山西北部地区Q值随频率的变化关系式。其中,阳原台Q0值最高,大同台Q0值最低。研究区多数台站都表现为低Q0值,高η值,符合Q值与频率的依赖关系,表明该地区地下介质非均匀程度高,构造活动强烈;另外,研究区大同台、右玉台和偏关台相对于本次研究的其他台站为低Q0值区,这一区域正好位于我省西北部NNE走向的口泉活动断裂处,中间以盆地为分割,与恒山、六棱山断裂分开,表明研究结果与研究区活动断裂和沉积厚度有一定的关系。

Using Sato single scatter model, seismic waveform data recorded by 13 digital stations in north of Shanxi from 2001 to 2011 are calculated and analyzed. Correlation of Q value of coda wave to frequency is fitted for the coda wave window of 40s and variation of Q value with frequency in north of Shanxi is figured out. The highest Q0value, which is up to 31.82 ,is at Yangyuan Station , whereas the lowest, 31.82, is at Datong Station. That most stations in studied region show low Q0 value and high -q value , which coincide with correlation of Q value and frequency, illustrates that non-uniform degree of underground medium is high and that tectonic activity is intensive in the region. In addition, compared with other stations with low Q0 value, Datong, Youyu and Pianguan stations that show low Qo value just locate at Kouquan fault of NNE direction in northwest of Shanxi province, being detached with Hengshan and Liulengshan fault by the basin. The result indicates that activity faults have some relation with sediment thick of the studied region.