Q值的简易测定与地震前兆分析

依据尾波衰减特征，采用测量尾波包络体最大双振幅方法，分别用单次散射和多次散射模式处理了苏、皖、鲁、冀四省４２个ＤＤ－１台站，５１个地震的尾波资料，求出与散射有关的地球介质Ｑ因子，并对Ｑ值随尾波推移时间窗、震中距的变化进行归一法处理，公式如文中式（１１）、（１２），用归一法求得的多次散射模式Ｑ０２值分布图象表明，高Ｑ值与中强地震的活动背景有关，这种简易测定地球介质Ｑ值的方法在地震前兆分析中有着良好的应用前景

FACILE DETERMINATION OF Q VALUE AND ANALYSIS FOR EARTIQUAKE PRECURSOR

According to the characteristics of coda attennation, and maximum double amplitude of envelope, Q of crust medium associated with scatter was obtained through treating 42 DD-1 stations and 51 coda data of Jiangsu, Anhui, Shandong and Hebei Provinces using single and multiple scatter models. The variation of Q value with the motive time windows of coda and change of epicentre distance was treated using reduction method. The Q value pattern of multiple scatter model indicates that high Q value relates to the active background of moderate earthquakes.