利用Aki模型对宁夏及邻区尾波Q值的研究

Research on Q Value of Seismic Coda in Ningxia and Adjacent Region Based on Aki Model

摘要:

利用单次散射的Aki模型,选取2008年1月-2009年12月宁夏地震台网记录的82次ML≥2.0地震的数字地震波资料,计算宁夏及邻区尾波Q值,拟合Q值对频率的依赖关系。全区域数据结果为Q(f)=(212±87.62).f0.7584±0.19。与国内其它区域相比,本区域Q值较低、对频率依赖性较高。结合区域地震地质构造特征及同期地震活动性将研究区划分为四个小震密集区:吉兰泰地震区、银川地震区、卫宁同地震区和固海地震区,分区对Q值进行数据统计,对比表明,尾波Q值较好地反映了小区地震活动特征。

Abstract:

Based on the Aki model,adopting 82 digital wave datas of earthquake with ML≥2.0 from January,2008 to December,2009,which were recorded by Ningxia earthquake network,the average Q values of seismic coda in Ningxia and adjacent region are calculated,and the relationship between Q value and frequency is polyfited.The whole region＇s result is Q（f）=（212±87.62）·f0.7584±0.19.Compared with other domestic regions,the Q value of seismic coda is relatively lower,but the dependence on frequency is higher.According to the regional seismic geology,tectonic characteristics and the homochronous seismic activity,the research region is divided into four concentrated minor-earthquake areas： Ji Lantai,Yin Chuan,Wei Ningtong and Gu Hai,and the Q values of four regions are counted.Comparison shows that Q values of seismic coda reflects the characteristics of seismicity in each area.