Details
Map Projection Name: Transverse Mercator
Scale Factor at Central Meridian: 0.999600
Longitude of Central Meridian: -114.000000
Latitude of Projection Origin: 42.000000
False Easting: 500000.000000
False Northing: 100000.000000
Planar Coordinate Information
Planar Distance Units: meters
Coordinate Encoding Method: coordinate pair
Coordinate Representation
Abscissa Resolution: 0.000100
Ordinate Resolution: 0.000100
Geodetic Model
Horizontal Datum Name: North American Datum of 1927
Ellipsoid Name: Clarke 1866
Semi-major Axis: 6378206.400000
Denominator of Flattening Ratio: 294.978698
Process step 1
Process description: Liquefaction susceptibility maps were produced for the following 7.5-minute U.S. Geological Survey quadrangles:
Ammon
Firth
Goshen
Idaho Falls North
Idaho Falls South
Lewisville
Menan Butte
Rexburg
Rigby
Ririe
Ucon
Woodville
These data were produced using a standard methodology that relates deposit age, texture, and environment of deposition to liquefaction susceptibility (Federal Emergency Management Administration, 2009, Table 4-10, p. 4-22; Youd and Perkins, 1978). The classification process was similar to that employed in Washington State (Palmer and others, 2004).
Earth materials within about 100 ft (30 m) of the surface were classified using 1:24,000-scale geologic maps for each of the quadrangles (Phillips and Welhan, in preparation). For each map unit, a score was assigned to each classifying factor then summed to give the classification. Symbols, scores, and the classification scheme used are provided in the spreadsheets listed at the end of this file. Bedrock does not liquefact, so only unconsolidated units were assigned a liquefaction susceptibility. Areas of bedrock overlain by >10 feet of unconsolidated materials were identified with water well records (IDWR, 2010) and classified on the basis of the unconsolidated deposits.
Process date: 2010
at time 09332000
Source 1
Contribution: REFERENCES CITED
Federal Emergency Management Agency, 2009, Multi-Hazard Loss Estimation Methodology Earthquake Model, HAZUS-MH MR4, Technical Manual (available at http://www.fema.gov/library/viewRecord.do?id=3731).
IDWR, 2010, Water well logs: Idaho Department of Water Resources, Boise. [Available at http://www.idwr.idaho.gov/GeographicInfo/GISdata/wells.htm]
Jorgensen, W., 1979, Soil survey of Jefferson County, Idaho: U.S. Department of Agriculture, Soil Conservation Service, 219 p. 66 map plates, scale, 1:20,000. [Available at http://soildatamart.nrcs.usda.gov/]
Noe, H.R., 1981, Soil survey of Madison County area, Idaho: U.S. Department of Agriculture, Soil Conservation Service, 128 p., 29 map plates, scale 1:24,000. [Available at http://soildatamart.nrcs.usda.gov/]
Miles, R.L., 1981, Soil survey of Bonneville County area, Idaho: U.S. Department of Agriculture, Soil Conversation Service, 108 p., 58 plates, scale 1:24,000. [Available at http://soildatamart.nrcs.usda.gov/]
Palmer, S.P. and others, 2004, Liquefaction susceptibility and site class maps of Washington State by county: Washington Department of Natural Resources, Division of Geology and Earth Resources Open File Report 2004-20 (available at fftp://198.187.344/geology/pubs/ofr04-20/).
Phillips, W.M. and J.A. Welhan, in preparation, Geologic maps of the Ammon, Firth, Goshen, Idaho Falls North, Idaho Falls South, Lewisville, Menan Butte, Rexburg, Rigby, Ririe, Ucon, and Woodville quadrangles, Idaho: Idaho Geological Survey Digital Web Maps, scale 1:24,000 (available at www.idahogeology.org).
Salzmann, R.A. and J.O. Harwood, 1973, Soil survey of Bingham area, Idaho: U.S. Department of Agriculture, Soil Conservation Service, 123 p., 120 plates, scale 1:24,000. [Available at http://soildatamart.nrcs.usda.gov/]
Welhan, J.A., in preparation, Water table model for use in liquefaction susceptibility mapping in the Idaho Falls-Rexburg area: Idaho Geological Survey Staff Report.
Youd, T.L. and M. Perkins, 1978, Mapping liquefaction-induced ground failure potential: Journal of the Geotechnical Engineering Division-ASCE, v. 104(4), pp. 433-446.
1. Process
Date and time:
20100629
at time 092701
Tool location:
C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\DefineProjection
Command issued
DefineProjection D:\Collette\LQ\lq PROJCS['NAD_1927_StatePlane_Idaho_East_FIPS_1101',GEOGCS['GCS_North_American_1927',DATUM['D_North_American_1927',SPHEROID['Clarke_1866',6378206.4,294.9786982]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]],PROJECTION['Transverse_Mercator'],PARAMETER['False_Easting',500000.0],PARAMETER['False_Northing',0.0],PARAMETER['Central_Meridian',-112.1666666666667],PARAMETER['Scale_Factor',0.9999473684210526],PARAMETER['Latitude_Of_Origin',41.66666666666666],UNIT['Foot_US',0.3048006096012192]] D:\Collette\LQ\lq
2. Process
Date and time:
20100702
at time 114507
Tool location:
C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\DefineProjection
Command issued
DefineProjection W:\DATABASE_MAPS\24K\idaho_falls_proj\LQClass\LQ_GIS\LQ_classification\LQ_geol_polyg20100629.shp PROJCS['NAD_1927_StatePlane_Idaho_East_FIPS_1101',GEOGCS['GCS_North_American_1927',DATUM['D_North_American_1927',SPHEROID['Clarke_1866',6378206.4,294.9786982]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]],PROJECTION['Transverse_Mercator'],PARAMETER['False_Easting',500000.0],PARAMETER['False_Northing',0.0],PARAMETER['Central_Meridian',-112.1666666666667],PARAMETER['Scale_Factor',0.9999473684210526],PARAMETER['Latitude_Of_Origin',41.66666666666666],UNIT['Foot_US',0.3048006096012192]] W:\DATABASE_MAPS\24K\idaho_falls_proj\LQClass\LQ_GIS\LQ_classification\LQ_geol_polyg20100629.shp