Online Links:
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.
We thank Max Wyss and Stefan Wiemer of the Geophysical Institute, University of Alaska, and John Lahr of the U.S. Geological Survey for their help with seismicity catalogs. Ken Rukstales prepared the ARC/INFO data and formatted the GIS versions of the maps.
This map is intended to summarize the available quantitative information about seismic ground motion hazard in Alaska from geologic and geophysical sources.
Are there legal restrictions on access or use of the data?Access_Constraints: none
Use_Constraints:The data are not to be used for areas outside of Alaska and the Aleutian Islands.
Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS as to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
| Data format: |
U.S. Geological Survey Geologic Investigations Series I-2679
(Sheet 2 of 2)
Seismic-Hazard Maps For Alaska and the Aleutian Islands, Sheet2, 2% Probability of Exceedance in 50 Years For Peak Horizontal Acceleration and Horizontal Spectral Response Acceleration For 0.2, 0.3, and 1.0 Second Periods (5% of Critical Damping) in format PDF (version version 4.0) Adobe Portable Document Format |
|---|---|
| Network links: |
http://pubs.usgs.gov/imap/i-2679/i2679-2.pdf |
Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS as to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
| Data format: | Seismic-Hazard Map For Alaska and the Aleutian Islands, 2% Probability of Exceedance in 50 Years For Horizontal Spectral Response Acceleration For 0.3 Second Period (5% of Critical Damping) in format ARCE (version 7.2.1) Size: 0.1367 |
|---|---|
| Network links: |
http://pubs.usgs.gov/imap/i-2679/ak3hz250.e00.gz |