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Interactions between the vibrations and the propagating
media give rise to several types of waves, including direct compressional
and shear body waves, refracted body waves, and both horizontally and vertically
polarized surface waves. These vibrational waves are of primary importance
in studies of the earth's interior and earthquake characteristics, but
their individual effects have been totally neglected
in blasting seismology. Analysis of damage to structures does not
require knowledge of what happens between the source and the receiver or
type of wave. It requires only the vibrational input to the house at its
foundation. Additionally, multiplydelayed shots are sufficiently complex
vibration sources to make identification of individual waves difficult,
if not impossible, under most conditions.
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