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Liquefaction Susceptibility and Site Class Maps of Washington State, by County In response to the Nisqually earthquake of 2001, DGER was awarded a grant by the Federal Emergency Management Agency and Washington Emergency Management Division to develop two types of earthquake hazard maps for every county in the state—liquefaction susceptibility maps, which outline areas where water-saturated sandy soil loses strength during earthquake shaking, and NEHRP (National Earthquake Hazards Reduction Program) site class maps, which outline areas where soils amplify ground shaking. The maps will be used by state and local governments to update existing hazard mitigation plans and to delineate geologically hazardous areas under the Growth Management Act. In response to the Nisqually earthquake of... Categories: Data; Types: ArcGIS REST Map Service, Map Service; Tags: Class, DNR, Geology, Natural Resources, Site, All tags... Wshington, liquefaction, susceptibility, Fewer tags