Description: These data contain points representing all known trenches and excavations along known or suspected active faults in the state of Washington.
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Description: NOTICE: Seismic Hazard Area, Within 200 ft. of an Active Fault (SCC 30.62B.350)These data contain arcs representing the location of faults with known or suspected Quaternary (<1,600,000 yrs) activity in the state of Washington. Data were gathered from numerous sources, including the Washington State portion of the U.S Geological Survey's 2010 "Quaternary fault and fold database of the United States". Faults were attributed with information such as age, visibility, method of detection, and in most cases, the corresponding ID number for the fault from the USGS database (for easy correlation between the two data sources). This dataset contains multiple interpretations of the same faults or fault systems by different authors, which may be only partially co-located. Differing interpretations are the result of different methods used to detect the faults and the scale of the investigation.
Service Item Id: bf7b1d5807da412c9dc71211488b7dee
Copyright Text: Washington Division of Geology and Earth Resources
Buffered and modified by PDS-GIS, 20151027
Description: The polygons in this dataset represent National Earthquake Reduction Program (NEHRP) site class, which provides a general guide to areas where earthquake shaking will be the strongest and where the potential damage to buildings and other structures may be elevated because of soil effects. Please note that it is only a general guide, and does not incorporate other factors affecting the actual severity of ground shaking, such as earthquake size or the distance of the area in question from the earthquake's focus. 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.
Service Item Id: bf7b1d5807da412c9dc71211488b7dee
Copyright Text: 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, 45 p. text].
Description: The polygons in this dataset provide information regarding relative liquefaction potential across Washington State. Liquefaction is a natural phenomenon in which saturated, sandy soils lose their strength and behave as a liquid. Liquefaction is caused by severe ground shaking during earthquake events. Please note that it is only a general guide, and does not incorporate other factors affecting the actual severity of ground shaking, such as earthquake size or the distance of the area in question from the earthquake's focus. 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.
Service Item Id: bf7b1d5807da412c9dc71211488b7dee
Copyright Text: 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, 45 p. text].