利用Sato模型研究宁夏及邻区尾波Q值分布特征  

The research on distribution characteristics of coda wave Q value in Ningxia and adjacent region based on the Sato model

作　　者：师海阔[1,2] 曾宪伟[2] 田小慧[2] 张立恒[2] 

机构地区：[1]中国科学技术大学,中国合肥230026 [2]宁夏回族自治区地震局,中国银川750001

出　　处：《地震地磁观测与研究》2016年第1期22-29,共8页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局三结合课题(143002)

摘　　要：利用Sato模型,选取2008年1月至2013年12月宁夏地震台网记录的波形清晰、噪声水平满足计算条件的ML≥2.0地震,计算宁夏及邻区各区域尾波Q值,与前人研究结果进行对比,得到研究区尾波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、灵武地区尾波Q值相对较高,与该区域存在高速区相对应;阿拉善左旗西南尾波Q值较低;盐池地区尾波Q值相对较高,对应该区稳定的地质构造;中卫、海原及附近地区尾波Q值相对较高,认为与该区域地壳深部的高温度与高热流值有关。Based on the Sato model, 565 earthquakes digital wave data above ML 2.0 from January,2008 to December, 2013 are adopted, which was recorded by Ningxia Earthquake Nets. The selected waveform records are clear and the noise levels meet requirements. By calculating the coda wave Q value of every area in Ningxia and adjacent region and comparing existing results,the distribution characteristics of coda wave Q value are obtained. The results show that the coda wave Q value in the north is higher than that in the south; The coda wave Q value in Wuzhong and Lingwu is relatively high, which corresponds with its high speed zone; Coda wave Q value of the southwest of Alashan Zuoqi is relatively low; Coda wave Q value in Yanchi is rather higher than other regions because of its steady geological structure. Coda wave Q value in Zhongwei,Haiyuan and their nearby regions is relatively high, and it is thought to be associated with the high temperature and heat-flow value in the deep crust of the area.

关 键 词：宁夏及邻区 SATO模型 尾波Q值 分布特征 

分 类 号：P315.7[天文地球—地震学]