Abstract: Waveforms generated by the first Brightlight 50t explosion were recorded by the Hailar array. Using array technique, the author performed identification, f-k analysis, velocity spectrum analysis, etc of the weak signals. The analysis results show that the signal-to-noise ratio after beaming was enhanced obviously and the signal can be shown clearly. The energy of this explosion is mainly concentrated in 1~8 Hz range from the f-k analysis. The velocity spectrum analysis gave clear positions of event phases, which can not be seen in the original weak signals. The maximum energy distribution resulted from beaman method is near the theoretical value in the azimuth-slowness domain.

Key words: Brightlight explosion, Hailar seismic array, Identification of weak signals