【摘要】 通过对乌鲁木齐、石场和库尔勒地震台十几年来地震波振幅比的系统追踪研究，发现在中强地震前，振幅比无论是在空间分布还是在时间进程上都显示出比较明显的异常变化特征。研究结果表明，当监测范围内的孕震介质发生变化时，单台地震波振幅比可以反映出介质的异常变化过程，该方法具有一定的预报效能。更多还原

【Abstract】 In this paper, the systematic study on the amplitude ratio of the seismic wave recorded at Wulumuqi, Shichang and Kuerle Stations seperately in tens years indicated that the amplitude ratio shows anomalous variation more clearly in space and time distributions before moderate earthquakes. It might be indicated that when the change of seismogenic medium in the monitoring area, the amplitude ratio of seismic wave recorded at a single station coule show this variation process,and this method has a certain predicta bitity.更多还原