Parent Layer: Landslide Hazards

Name: Lahar Hazard Areas

Display Field: CREATOR_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Last updated on 10/9/2015 by KLB.This dataset contains inundation zones for Case 1 lahars which are defined as areas that could be affected by cohesive lahars that originate as enormous avalanches of weak, chemically altered rock from the volcano. case I lahars can occur with or without eruptive activity. The average time interval between Case I lahars on Mount Rainier is about 500 to 100 years.This data is part of a dataset that contains lahar_case_1, lahar_case_2, lahar_case_3, postlahar, and pyroclastic, lahar_parcel, and lahar_study_area. Lahar_parcel and lahar_study_area were added by The Washington Division of Geology and Earth Resources. Lahar_case_1, Lahar_case_2, lahar_case_3, postlahar, and pyroclastic originated from USGS Open-File Report 2007-2005: Schilling, S. P.; Doelger, S.; Hoblitt, R. P.; Walder, J. S.; Driedger, C. L.; Scott, K. M.; Pringle, P. T.; Vallance, J. W., 2008, Digital data for volcano hazards from Mount Rainier, Washington; Revised 1998: U.S. Geological Survey Open-File Report 2007-1220, ArcInfo coverages and shapefiles. [http://pubs.usgs.gov/of/2007/1220/data.html].This digital data accompanies Volcano Hazards from Mount Rainier, Washington; Revised 1998 (U.S. Geological Survey Open-File Report 98-428): Hoblitt, R. P.; Walder, J. S.; Driedger, C. L.; Scott, K. M.; Pringle, P. T.; Vallance, J. W., 1998, Volcano Hazards from Mount Rainier, Washington; Revised 1998: U.S. Geological Survey Open-File Report 98-428 [http://vulcan.wr.usgs.gov/Volcanoes/Rainier/Hazards/OFR98-428/OFR98-428.pdf]Mount Rainier is a dormant volcano that is the highest peak in the Cascade Range and carries a larger load of glacier ice than any other mountain in the contiguous U.S. The mountain's large ice mass and great topographic relief poses geologic hazards during both future eruptions and time periods without eruptive activity. GIS data layers case 1, case 2, and case 3 were delineated by scientists at the Cascade Volcano Observatory and depict various lahar inundation zones around the mountain. The lahar hazards were defined by field investigations and construction of cross sections. For examples and descriptions of field investigations and cross section construction, see:Scott, Kevin M.; Vallance, James W., 1995, Debris flow, debris avalanche, and flood hazards at and downstream from Mount Rainier, Washington: U.S. Geological Survey Hydrologic Investigations Atlas HA-729, 2 sheets, scale 1:100,000, with 9 p. text. [accessed Apr. 10, 2002 at http://vulcan.wr.usgs.gov/Volcanoes/Rainier/Hazards/HA-729/framework.html] Scott, K. M.; Vallance, J. W.; Pringle, P. T., 1995, Sedimentology, behavior, and hazards of debris flows at Mount Rainier, Washington: U.S. Geological Survey Professional Paper 1547, 56 p., 1 plate. [accessed Sep. 29, 2009 at http://pubs.er.usgs.gov/usgspubs/pp/pp1547]

Service Item Id: b2341b60e6cd4396bc8f474b6c5a30be

Copyright Text: U.S. Geological Survey Volcano Hazards Program, Thurston GeoData Center

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Supported Query Formats: JSON, geoJSON, PBF

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• HazardAreaCode ( type: esriFieldTypeSmallInteger, alias: HazardAreaCode , Coded Values: [1: Downstream] , [2: Upstream] )
• EDIT_DATE ( type: esriFieldTypeDate, alias: EDIT_DATE, length: 8 )
• GlobalID ( type: esriFieldTypeGlobalID, alias: GlobalID, length: 38 )
• CREATOR_NAME ( type: esriFieldTypeString, alias: CREATOR_NAME, length: 255 )
• CREATE_DATE ( type: esriFieldTypeDate, alias: CREATE_DATE, length: 8 )
• Scenario ( type: esriFieldTypeString, alias: Scenario, length: 7 )
• StudyArea ( type: esriFieldTypeString, alias: StudyArea, length: 20 )
• EDITOR_NAME ( type: esriFieldTypeString, alias: EDITOR_NAME, length: 255 )
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