Service Description: (This is an extract and reclassification of WGS statewide liquefaction susceptibility layer, for a King County 2023 earthquake debris study. Original metadata purposely retained. The TYPE field is a reclassification of the original data. Individual polygons dissolved into multi-part polygons based on TYPE field)
The Washington State Department of Natural Resources, Division of Geology and Earth Resources received grant funding through the Hazard Mitigation Grant Program (HMGP) following the Nisqually earthquake of February 2001 (FEMA-1361-DRWA). This grant required the Division of Geology and Earth Resources to develop statewide liquefaction susceptibility and NEHRP (National Earthquake Hazards Reduction Program) site class maps.
Regional earthquake hazard maps such as these support hazard mitigation, emergency planning and response, planning of local zoning ordinances, and building code enforcement. The primary reason for producing this series of earthquake hazard maps is to support revisions to the State Hazard Mitigation Plan required in the implementation of final rules 44CFR201.4 and 44CFR201.6. These Federal code regulations require both state and local agencies to describe the location and extent of earthquake hazards that affect their jurisdictions. Additionally, these maps will serve a great variety of end-users that are crucial partners in earthquake hazard mitigation.
Service ItemId: 8a2b791a8ccb4a30a17f7abd40be54ab
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: True
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Description: These data contain polygons that provide information regarding the relative liquefaction potential for Washington State. This feature class is part of a geodatabase that contains statewide ground response data for Washington State. Other feature classes are seismic_design_class_d, seismic_design_site_class, and seismic_site_class. Liquefaction is a natural phenomenon in which saturated, sandy soils lose their strength and behave as liquid. Liquefaction is a caused by severe ground shaking during earthquake events. Polygons are classified as having 'very low' to 'high' relative liquefaction susceptibility. Areas underlain by bedrock or peat are mapped separately as these earth materials are not liquefiable, although peat deposits may be subject to permanent ground deformation caused by earthquake shaking and require site-specific analysis under the International Building Code. Water and ice are also separately designated. Liquefaction susceptibility is assigned based on criteria described in: Palmer, Stephen P.; Magsino, Sammantha L.; Bilderback, Eric L.; Poelstra, James L.; Folger, Derek S.; Niggemann, Rebecca A., 2007, Liquefaction susceptibility and site class maps of Washington State, by county: Washington Division of Geology and Earth Resources Open File Report 2004-20, 78 plates, with 45 p. text. [http://www.dnr.wa.gov/ResearchScience/Topics/GeologyPublicationsLibrary/Pages/pub_ofr04-20.aspx]
(For the 2023 King County earthquake debris study, the following reclassification was done for Hazus importing purposes: N/A (bedrock, ice water), “very low”: 1 “very low to low”, “low” : 2 “low to moderate”, “moderate”: 3 “moderate to high”: 4 “high”: 5 )
Stephen P. Palmer, Sammantha L. Magsino, James L. Poelstra, Eric L. Bilderback, Derek S. Folger, and Rebecca A. Niggemann of the Washington State Department of Natural Resources, Geology and Earth Resources Division
Spatial Reference: 2926 (2926)
Initial Extent:
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YMin: 180105.64041438
XMax: 1326294.92216802
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Spatial Reference: 2926 (2926)
Full Extent:
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YMin: 30856.6441990192
XMax: 1583277.02427853
YMax: 305970.825782268
Spatial Reference: 2926 (2926)
Units: esriFeet
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