浙江及邻区尾波Q值研究

Research on Coda Q Value in Zhejiang Province and Neighbouring Areas

摘要:

基于单次散射(Aki)模型,利用2000年至今浙江及安徽台网记录的37次ML3.0以上地震的数字地震波资料,计算了浙江及邻近省区平均尾波Q值,并拟合了Q值对频率的依赖关系数据。结果为:Q(f)=212±33.5f0.62±0.11,与国内其它区域相比,本区域为Q值高值、对频率低依赖性区域。认为本研究区内构造活动弱,地震活动水平低。本文就Q值对频率、尾波窗长等的依赖性特征及影响Q值计算的噪声水平、滤波器、数据采样等因素进行了深入分析。

Abstract:

Based on the single scatter model（ Aki ）, using 37 earthquake digital wave data above ML3.0 from 2000 to now recorded by Zhejiang and Anhui earthquake nets, the average Q value of coda in relative region is calculated, and relationship between Q value and frequency is polyfited. The result isQ（f）=212±33.5f^0.62±0.11. Contrasting the result with that of other domestic region, the coda scatter feature is that the Q value is higher but dependence on frequency is lower, so it is considered that tectonic activity and seismisity are low in this region. Also the effects from those factors including coda windows length, noise level, filter type and so on, which are thought to change Q value in data processing, are analysed deeply in this paper.