In this paper,we make a primary analysis of the temporal-spatial dis-tributions characteristics of the amplitude ratio,including those of the imminent shock anomaly before the 4 strong and moderate earthquakes in kuche-kurle,Xinjiang.
The preliminary results show that:(1)The amplitude ratio of the maximum vertical displacements of the S and P waves remarkably decreased before and after the strong and moderate earthquakes.(2)During the four months before the shock,near the seismograph stations from their epicnters,the As/Ap appeared suddenly immediately was observed at times.(3)The temporal-spatial distribution of the As/Ap appeared su-ddenly is most concentrated in ten days before the shock.(4)The As/Ap anomalies correspond approximately with the velocity ratio anomalies of seismic waves and duration ratio of the seismic waves.
Finally,it is suggested that it be possible to make use of the anoma-lies of the amplitude ratio to predict earthquake.