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Probabilistic Liquefaction Triggering and Lateral Spread Hazard Maps for Davis, Weber, Salt Lake, and Utah Counties, Utah
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2020-05-01
[PDF-9.05 MB]
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Edition:June 2018 to May 2020
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Abstract:Utah’s intermountain valleys along the western edge of the Wasatch Front contain widespread deposits of loose, saturated, cohesionless soils that are susceptible to liquefaction during major, nearby earthquakes. Liquefaction can induce ground deformations that can be very damaging to buildings, roadways, bridges, pipelines, buried structures, etc. The most pervasive type of liquefaction-induced ground deformation is lateral spreading, where blocks of mostly intact soil above a layer of liquefied soil may displace down gentle slopes up to tens of feet, thereby compressing or tearing apart foundations, crippling utility lines, damaging roadways, etc. To address this hazard, probabilistic-based hazard assessment is an important component in quantifying the risk and reducing potential losses from earthquakes. The development of probabilistic national seismic hazard maps and the adoption of these maps by various building codes and government agencies allow for the development of complementary liquefaction triggering and ground deformation hazard maps. Liquefaction and ground deformation hazard maps assist hazard planners, emergency responders, risk analysts, and public/private decision makers in the preliminary and/or regional assessment of liquefaction hazard. In addition, they help prioritize and complement site-specific liquefaction and lateral spread hazard evaluation procedures. This report presents the development of an improved, fully-probabilistic procedure for mapping liquefaction triggering and lateral spread displacements at multiple return periods. It incorporates performance-based models for liquefaction triggering (Kramer and Mayfield 2007) and lateral spread displacement (Franke and Kramer 2014). The procedure is applied to develop liquefaction triggering and lateral spread displacement hazard maps for Weber, Davis, Salt Lake, and Utah Counties, Utah at return periods of 475, 1033, and 2475 years. In addition to this report and the PDF maps herein, project deliverables included a database structure, a Davis County geotechnical database, and TIF and GIS formats of the new maps.
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