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根据尾波观测的经验公式，选用北京遥测台网东部9个台站所记1989—1990年唐山地区10个地震的数字化记录，采用多台多震综合求解法，得到各地震的震源因子，并和单台多震法求得震源因子的平均值进行了比较．多台法所得震源因子精度明显优于单台法；且两者均比直达S波所求波谱比的精度提高1倍以上。提出了以一定的震源模型为基础，由震源因子求震源谱的方法．结果表明，ω一次方模型（即震源港高频部分与角频率ω的一次方成反比）较二次方模型更适合于本文所用的数据（震级范围为ML，3．0－5．2）．由于尾波能有效地消除震源辐射因子和单一路径的影响，故易于得到较多的资料和较高的精度，为研究震源的性质提供了一个有效的方法．
According to the empirical formula of coda wave observation, the digital records of 10 earthquakes recorded in Tangshan area from 1989 to 1990 recorded by 9 stations in the east of Beijing telemetry station are selected, and the multi-seismic multi-earthquake method is used to obtain the focal factor of each earthquake. Compared with the average of the source factors obtained by single multi-seismic method. The accuracy of the source factors obtained by the multiple methods is obviously better than that of the single method; and the precision of the spectral ratio obtained by the direct S wave is more than doubled. Based on a certain source model, a method of seeking source spectrum from the source factor is proposed. The results show that the ω first-order model (that is, the high frequency part of the source port is inversely proportional to the square of the angular frequency ω) is more suitable for the data used in this paper than the quadratic model (magnitude range is ML, 3.0-5.2) . Because the coda wave can effectively eliminate the impact of source radiation factor and single path, it is easy to get more information and higher accuracy, which provides an effective method for studying the nature of the source.