Liquefaction Susceptibility Maps for the Idaho Falls-Rexburg Areas Idaho

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Keywords
Theme: Liquefaction Susceptibility
Place: Ammon, Firth, Goshen, Lewisville, Menan Buttes, Rexburg, Rigby, Ririe, Ucon, Woodville, Idaho Falls North, Idaho Falls South, Bingham County, Bonneville County, Jefferson County, Madison County

Description
Abstract
Liquefaction occurs during strong earthquake ground shaking when saturated, cohesionless earth materials lose strength due to high excess pore-water pressure.  The consequences of liquefaction can be catastrophic, including destruction of railways, roads, bridge abutments, and building foundations. Liquefaction susceptibility is highest in artificial fills and loose, sandy deposits that are saturated with water. Such deposits may occur adjacent to rivers, streams, and lakes, even in a semi-arid region like southern Idaho. Irrigation may also increase liquefaction susceptibility by saturating deposits.

Purpose
These maps are a general guide to outline areas with the potential for liquefaction. Because this map is based on regional geological and hydrological mapping, detailed geotechnical investigation is required to determine actual ground conditions for specific building sites. 

Map users should use both the susceptibility class and indicators of water table depth when evaluating liquefaction susceptibility. The highest liquefaction hazards are in areas underlain by young, sandy sediments with high water tables. Artificial fills that have not been properly compacted are especially hazardous. 

The maps are intended to be used at a scale of 1:24,000. As with all maps, users should not apply this map, either digitally or on paper, at more detailed scales.

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