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Centrus Seismic Zones data represents a model showing
the probability that ground motion will reach a certain level. This data set of
3,359 objects shows peak horizontal ground acceleration (the fastest measured
change in speed, for a particle at ground level that is moving horizontally due
to an earthquake) with a 10% probability of exceedance in 50 years. Values are
given in %g, where g is acceleration due to gravity, or 9.8 meters/second2. The
lines of equal hazard, which are the lines between the polygons, were
determined by interpolating from a grid of equally spaced points in latitude
and longitude. Each point was weighted based on the seismic hazard at that
location. The grid spacing is 0.1 degrees for Alaska and the conterminous
United States, and 0.02 degrees for Hawaii. The data is intended for analysis
at the national level, and for large regional areas. The data should be
analyzed at scales appropriate for 1:2,000,000-scale data.
Centrus Seismic data is designed for use with Centrus Spatial+ solutions.
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Map of Seismic zones in
the U.S.
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Map showing Southern
California Seismic zones
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Specifications
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Standard: Seismic Hazard Areas
Coverage: United States
Unit of Sale: National
Frequency: As Needed
Vintage: 2004
Scale: 1:2,000,000
Datum: NAD83
Projection: Unprojected Lat/Lon
Format: Centrus GSB
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