Parent Layer: Geologic

Name: Liquefaction Prone Areas

Display Field: LIQUEFACTION_SUSCEPT

Type: Feature Layer

Geometry Type: esriGeometryPolygon

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]

Copyright Text: 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

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Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

Drawing Info:

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Field 1: LIQUEFACTION_SUSCEPT
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Field 3: N/A
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• Value: low to moderate
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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• LIQUEFACTION_SUSCEPT_ID ( type: esriFieldTypeDouble, alias: Polygon ID )
• LIQUEFACTION_SUSCEPT ( type: esriFieldTypeString, alias: Liquefaction Susceptibility, length: 18 )
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