利用Aki模型对宁夏及邻区尾波Q值分布特征的研究

摘要

从2008年1月至2013年12月宁夏地震台网记录的 665次ML≥2.0 地震的数字地震波形资料中,选取波形记录清晰、噪声水平满足计算条件的数字地震波形记录,利用 Aki 模型,计算宁夏及邻区各区域尾波Q值,并与前人已有结果进行对比,得到该区尾波Q值的分布特征.结果表明:宁夏及邻区尾波Q值整体呈北高南低分布;吴忠、灵武地区该值相对较高,与该区域存在高速区相对应;阿拉善左旗西南该值较低;中卫、海原及附近地区该值相对较低,认为与该区域地壳深部的高温度与高热流值有关.%In this study,we analyze the distribution characteristics of Q value of seismic coda in Ningxia and neighboring areas by considering 665 digital wave data points of earthquakes with ML≥2.0 from January,2008 to December,2013 recorded by the Ningxia Earthquake Network using the Aki model.The selected waveform records are clear,and the noise levels satisfy the require-ments.By comparing the Q values of seismic coda in each area of the Ningxia Province and its ad-j acent region with existing results,the distribution characteristics of Q value of seismic coda are obtained.The results show that the Q value of seismic coda is higher in the north than in the south.The Q values of seismic coda in Wuzhong and Lingwu areas are relatively high,corre-sponding to the high-speed zone.The Q values of seismic coda in the region southwest of Alashan Zuoqi and those in Zhongwei,Haiyuan,and their adjacent regions are relatively low.These re-sults may be associated with the high temperatures and heat-flow values in the deep crust of those areas.