Abstract
Hypotheses that typical building foundations attenuate amplitudes of incident earthquake motions by scattering mechanism has been investigated. By analysis of normalized spectra of motions recorded inside building foundations it is found that the effect of size of building foundation if present is much smaller than the inherent variance of the data so far recorded in 57 building. Through comparison with theoretical results for vibration of rigid hemispherical and the disk foundation it is concluded that the relative rigidity of foundation may play a major role in influencing the degree to which foundation size influences strong motion recorded in building basements.
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