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针对2000年姚安6.5级、2001年施甸5级、2001年永胜6.0级和2003年大姚6.2、6.1级地震序列,分别采用多台法和固定台站方法计算了这些地震序列的波速比。由于采用的均是数字波形资料,到时读取精度达到0.02s。考虑台站因素,计算波速比的置信度最低达到95%。文中讨论强余震之前波速比的变化特征,发现强余震前出现波速比趋势性下降的特征,这对强余震的短临预测有实用价值;主震发生时和发生以后波速比的波动范围的对比,对震区的震情趋势判定有一定的指示和参考。
Aiming at the sequence of Yao’an 6.5 in 2000, Shidian 5 in 2001, Yongsheng 6.0 in 2001 and 6.2 and Dayao 2003 earthquakes in 2003, the wave velocities of these seismic sequences are calculated by using multiple methods and fixed stations respectively ratio. As a result of the digital waveform data are used, when the reading accuracy of 0.02s. Taking station factors into consideration, the confidence of calculating the wave velocity ratio is as low as 95%. In this paper, the changing characteristics of wave velocity ratio before strong aftershock are discussed. It is found that the tendency of wave velocity ratio declines before strong aftershock, which has practical value for short-term prediction of strong aftershocks. The fluctuation range of wave velocity ratio at occurrence of mainshock and after occurrence , There is a certain indication and reference to the earthquake tendency trend judgment.