用地震波频谱计算Q值的新方法

在研究用频谱比率法计算Ｑ值局限性的基础上，提出了基于地震波频谱计算Ｑ值的新方法。利用相邻两个反射信号频谱的主频及其斜率，或对第二个反射信号的频谱进行Ｑ扫描补偿，使该频谱与第一个反射信号频谱间的相似系数最大或两者主频相同的方法计算Ｑ值。这些方法克服了频谱比率法的不稳定性。

NEW METHODS CALCULATING Q VALUE USING SPECTRUM OF SEISMIC RECORD

On the basis of studing the limitations of spectrum ratio method forcalculating the seismic quality factor Q,this article puts forward several new methods.These methods make use of the main frequancies computed from reflection signals whichare reflected by two interfaces of a layer and the slope of the spectrum,or compensate thesecond spectrum by different Q value.When the main frequencies are the same,or theresemblance coefficient of the spectrums is maximal,Q can be obtained.These methodsare better than spectrum ratio method in some aspects.