Little strong-motion data exists for seismic motions in the Intermountain seismic belt. Measurements of low-strain ground motions at 82 different locations in the urban areas of the Intermountain seismic belt were made to investigate the variations of ground-motion characteristics of a seismic data base for ground-motion hazards study. The low-strain ground-motion data used in this report were measured from underground nuclear testing at the Nevada Test Site, Nevada.
The ground-motion data seismograms, derived spectra, and spectral ratios of alluvium to rock sites are presented in this report. The average spectral amplification on soils observed using induced horizontal ground motions varied from a factor of 1.2-18.3.
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Wasatch Front urban area seismic response data report, Utah