Seismic Soils & Liquefaction Risk - Mason County WA ... · Seismic Soils & Liquefaction Risk B B-C...
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Mason County Date: July 10, 2017 Sources: Mason County GIS; WADNR Seismic Soils & Liquefaction Risk B B-C C C-D Rock Very Dense Soil & Soft Rock Stiff Soil Soft Soil Requires Site-Specific Investigation Increasing Amplification of Ground Shaking F E D-E D Soil Classification Soil classification data provided by the Washington State Department of Natural Resources - Division of Geology & Earth Resources. This data has been published at a scale of 1:100,000. The dataset identifies site classes for approximately 33,000 polygons derived from the geologic map of Washington State. The methodology chosen for developing the site class map required the construction of a database of shear wave velocity measurements. This database was created by compiling shear wave velocity data from published and unpublished sources, and through the collection of a large number of shear wave velocity measurements from seismic refraction surveys conducted for this project. All of these sources of data were then analyzed using the chosen methodologies to produce the statewide site class data. ) l ? v ) l ) l ! ( ! ( ! ( ! ( ! ( ! ( ^ _ ! ( Kitsap Pierce Thurston Allyn Belfair Grapeview Hoodsport Lilliwaup Potlatch Shelton Union ) l ? v ) l ) l ! ( ! ( ! ( ! ( ! ( ! ( ^ _ ! ( Kitsap Pierce Thurston Allyn Belfair Grapeview Hoodsport Lilliwaup Potlatch Shelton Union Liquefactrion data provided by the Washington State Department of Natural Resources - Division of Geology & Earth Resources. This data is based solely on surficial geology and has been published at a scale of 1:100,000. A liquefaction susceptibility map provides an estimate of the likelihood that soil will liquefy as a result of earthquake shaking. Mason County depicts the relative susceptibility to liquefaction from bedrock to areas of high susceptability. Areas underlain by bedrock or peat are mapped separately as these earthen materials are not liquefiable, although peat deposits may be subjected to permanent ground deformation as a result of earthquake shaking. National Earthquake Hazard Reduction Program (NEHRP) Soils Liquefaction Susceptibility Peat Bedrock Not Susceptible High Moderate to High Moderate Low to Moderate Low Very Low to Low Very Low Susceptible Liquefaction Susceptibility
Transcript of Seismic Soils & Liquefaction Risk - Mason County WA ... · Seismic Soils & Liquefaction Risk B B-C...
Mason County
Date: July 10, 2017Sources: Mason County GIS;WADNR
Seismic Soils & Liquefaction Risk
B B-C C C-DRock Very Dense
Soil & Soft RockStiff Soil Soft
SoilRequires
Site-SpecificInvestigation
Increasing Amplification of Ground Shaking
FED-ED
Soil ClassificationSoil classification data provided by the Washington State Department of Natural Resources - Division of Geology & Earth Resources. This data has been published at a scale of 1:100,000.
The dataset identifies site classes for approximately 33,000 polygons derived from the geologicmap of Washington State. The methodology chosen for developing the site class map requiredthe construction of a database of shear wave velocity measurements. This database was createdby compiling shear wave velocity data from published and unpublished sources, and throughthe collection of a large number of shear wave velocity measurements from seismic refraction surveysconducted for this project. All of these sources of data were then analyzed using the chosenmethodologies to produce the statewide site class data.
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Kitsap
Pierce
Thurston
Allyn
Belfair
Grapeview
Hoodsport
Lilliwaup
Potlatch
Shelton
Union )l
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Kitsap
Pierce
Thurston
Allyn
Belfair
Grapeview
Hoodsport
Lilliwaup
Potlatch
Shelton
Union
Liquefactrion data provided by the Washington State Department of NaturalResources - Division of Geology & Earth Resources. This data is based solelyon surficial geology and has been published at a scale of 1:100,000.
A liquefaction susceptibility map provides an estimate of the likelihood that soilwill liquefy as a result of earthquake shaking. Mason County depicts the relativesusceptibility to liquefaction from bedrock to areas of high susceptability. Areasunderlain by bedrock or peat are mapped separately as these earthen materialsare not liquefiable, although peat deposits may be subjected to permanentground deformation as a result of earthquake shaking.
National EarthquakeHazard Reduction
Program (NEHRP) SoilsLiquefactionSusceptibility
PeatBedrock
NotSusceptible
HighModerate to HighModerateLow to ModerateLowVery Low to LowVery Low
Susceptible
Liquefaction Susceptibility
