State-Of-The-Art for Assessing Earthquake Hazards in the United States. Report 7. Specifying Peak Motions for Design Earthquakes.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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The large dispersion of data for components of earthquake motion requires that the spread be appraised in design applications. Instrumental data also must be related to historic records of intensity. The near field and the far field contribute greatly to differences in peak motions. Site conditions, soil versus rock, affect duration. With these considerations, and with geological studies and the probability of recurrence, peak values can be specified from parameters of motions related to Modified Mercalli intensities. These peak values can be used for rescaling selected strong motion records or alternatively for the generation of synthetic seismograms. The procedure incorporates the wide variability in ground motions that have occurred during earthquakes. Author