Seismic-Hazard Maps for Alaska and the Aleutian Islands: 3HZ250

Online link https://geo-nsdi.er.usgs.gov/metadata/map-i/2679/3HZ250.faq.html
Description Probabilistic seismic hazard maps were prepared for Alaska portraying peak horizontal ground acceleration and horizontal spectral response acceleration for 0.2, 0.3, and 1.0 second periods with probabilities of exceedance of 10% in 50 years and 2% in 50 y
Originators Wesson, Robert L.; Frankel, Arthur D.; Mueller, Charles S.; Harmsen, Stephen C.; and Rukstales, Kenneth S.

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States or counties

Overview of attributes

>Attribute items are in ARC/INFO feature class format.  Additional
>items that were added to the data are:
>
>POLYGON
>
>attribute        description
>=========	===========
>acc_val	      Acceleration value in percent of gravity of the
>                 polygon.  The polygon represents the range of
>                 acceleration values that are contained within its
>                 borders.  The polygon is assigned the lowest value
>                 allowed within the polygon's borders.  The range of
>                 values allowed within a polygon is controlled by the
>                 contours.  Valid values are:  0,4,8,12,16,20,24,28,32,
>                 36,40,60,80,100,120,160,240,320,400
>
>valley		A topological indicator that tells whether the area
>                 contained within the polygon is a local minima (valley)
>                 or not.  A value of "1" indicates the area is a local
>                 minima.
>LINE
>
>attribute 	description
>=========	===========
>acc_val	      Acceleration value in percent of gravity that the
>                 contour represents.  Valid values are: 0,4,8,12,16,20,
>                 24,28,32,36,40,60,80,100,120,160,240,320,400
>
>valley		A topological indicator that tells whether the area
>                 contained within the contour is a local minima (valley)
>                 or not.  A value of "1" indicates the area is a local
>                 minima.

none