By: William R. Lund

The Utah Geological Survey has revised and updated the Utah fault database used with the Federal Emergency Management Agency’s Hazus Earthquake Model. The Hazus Earthquake Model loss estimation software is designed to produce loss estimates for use by federal, state, regional, and local governments in planning for earthquake risk mitigation, emergency preparedness, response, and recovery. The model’s loss estimates are based on a scenario earthquake on a fault in an area of interest. This revised Hazus Utah fault database provides parameters for scenario earthquakes on significant Utah Quaternary-active faults statewide and for select faults/fault sections in adjoining states. The previous Utah Hazus fault database contained 27 Quaternary faults/fault sections taken largely from fault sources on the United States National Seismic Hazard Maps. This revised database expands the Utah Hazus fault database to include all known Late Quaternary and younger faults/fault segments capable of generating a ≥M 6.75 earthquake in Utah, and includes 82 Quaternary-active faults/fault segments, and nine credible multisegment rupture scenarios.

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