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Waveforms generated by the 50t explosion of project Brightlight(Ⅰ) were recorded by HILR array.Using array techniques,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 beamforming was obviously enhanced,and the signal could be clearly shown.The energy from this explosion was mainly concentrated in the 1 ～ 8Hz range from f-k analysis.The velocity spectrum gave clear positions of event phases,which could not be seen in the original weak signals.The maximum energy distribution obtained by the Beaman method is close to the theoretical value in the azimuth-slowness domain.
Waveforms generated by the 50t explosion of project Brightlight (I) were recorded by HILR array. Using array techniques, the author performed identification, fk analysis, velocity spectrum analysis, etc. of the weak signals. The analysis results show that the signal-to -noise ratio after beamforming was obviously enhanced, and the signal could be clearly shown. The energy from this explosion was mainly concentrated in the 1 ~ 8Hz range from fk analysis. The velocity spectrum gave clear places of event phases, which could not be seen in the original weak signals. The maximum energy distribution obtained by the Beaman method is close to the theoretical value in the azimuth-slowness domain.