SyntheticP wave seismograms from Longshot,Milrow and Cannikin explosions

The effect of spalling and other transfer functions is considered on the amplitude spectra and waveforms of telese mis short periodP wave seismograms generated due to Longshot. Milrow and Cannikin underground nuclear explosions. Source models of Haskell and Seggern were used for computingP wave seismograms from these events. Step-by-step variations of the amplitude spectra and waveforms ofP wave signal as is propagates from source to various seismometer array stations show that the source function, the source crust transfer function, the mantle transfer function and the spalling function are the most important factors that influence shaping of spectra and waveforms ofP seismograms. Comparison of computed and observedP wave seismograms at various seismometer array stations for Longshot explosion shows that computed seismograms do reproduce many of the features of observed seismograms. The results also support the conclusion that overburdenP wave velocity inferred from observed seismograms is less as compared to its value obtained from on-site measurements.