ESTIMATION OF RELATIVE VELOCITY SPECTRA.

This paper summarizes a new method of empirical scaling of relative velocity spectrum amplitudes of a single-degree-of-freedom viscously damped oscillator subjected to strong earthquake ground motion. Regression models are presented for scaling of spectral amplitudes in terms of earthquake magnitude and epicentral distance, and of Modified Mercalli Intensity at a site. The effects of geologic setting of the station and the distribution of spectral amplitudes have been included. Refs.