Provisional seismic hazard zones for earthquake-induced ground failures have been delineated for portions of the three-county area most affected by the Northridge earthquake using a simplified hazard assessment methodology. The procedure integrates surface geology, topography, and groundwater information using GIS technology. While not a replacement for “official” seismic hazard zones, which are based on a more detailed and comprehensive analysis of hazard, these provisional zones will assist in the immediate and cost-effective distribution of postearthquake hazard mitigation funds.

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