Abstract
A method for seismic microzonation of a large metropolitan area is examined. It utilizes information on the location of active faults and their relative levels of seismicity, the three-dimensional source to station geometry, the frequency dependent attenuation, the effects of local amplification of wave amplitudes in terms of the depth of sedimentary deposits beneath the site, and the scaling in terms of earthquake magnitude. The method presented here does not require any new or difficult steps to gather data, when compared to other microzonation procedures employed in the United States or abroad. The advantage of the method lies in its ability to properly balance different contributing factors to the seismic risk at a point, in time, space and frequency of strong ground shaking.
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