Q值的简易测定与地震前兆分析
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摘要
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
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.
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.
引文
1AkiK．Analysisoftheseismiccodaoflocalearthquakesasscateredwaves．J．Geophys．Res．1969，（74）：615～6312高龙生，华正兴，李瑞宣．用尾波的强度和衰减估算北京地区S波的平均自由程．地震学报，1987，9（4）：347～3633黄才中，葛焕称．中国东部的尾波衰减特征和QC值估计．地震学报，1995，17（2）：196～2024顾瑾平，杨彩霞，黄耘，黄才中．尾波特性指标变化与前兆分析．地震学报，1994，16（增刊）：73～81
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