SEISMIC WAVES GENERATED BY CHEMICAL EXPLOSIONS
Final rept., 1 Aug 1960-31 July 1963
SAINT LOUIS UNIV MO INST OF TECH
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The spectrum of explosion-generated Rayleigh waves, even at close range, may be so narrow that the source fuction computed by phase equalization is oscillatory. The data suggest that the medium at the shot and the geologic layering may have more influence on the spectrum than the yield does. The radiation of Rayleigh waves from a shot distributed in space and time can be explained by single superposition. Delays due to both spartial distribution and the interval between detonations must be taken into account. The effect of shot depth on body wave properties cannot be separated easily from the effect of changing material properties with depth. The shots in clay is the result of combining the oscillatory P-wave emanating from the source with reflections from near-surface boundaries. SH motion is a normal effect of buried explosions. Shots in brittle media produce relatively longer shear waves. The shear energy is radiated in a lobed pattern. Shear waves radiating directly from the shot have been identified vertically above a buried source.