Abstract: By means of sampling and analyzing the real-time earthquake waveform data with high resolution and precision produced by the seismic digital monitor network, the authors discover that the period and amplitude of earth pulsation waveform have evidently changed before moderately strong earthquakes. The exploration of change characteristics and regularity of earth pulsation before moderately strong earthquake will provide reliable information for the regional earthquake prediction and research.

Key words: Digital seismic information, Earth pulsation change characteristics, Seismic prediction method