USGS Geoscience Data Catalog
Additional USGS Geoscience data can be found by geographic location or by publication series.
Wesson, Robert L., Frankel, Arthur D., Mueller, Charles S., Harmsen, Stephen C., and Rukstales, Kenneth S. (compiler), 1999, Seismic-Hazard Maps for Alaska and the Aleutian Islands: 1HZ250: U.S. Geological Survey Geologic Investigations Series I-2679, U.S. Geological Survey, Denver, Colorado.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
The map projection used is Albers Conical Equal Area.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.0001
Ordinates (y-coordinates) are specified to the nearest 0.0001
Planar coordinates are specified in Meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
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: 0,2,4,6,8,10,12,14,16,18,
20,30,40,50,60,80,120,160,200
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: 0,2,4,6,8,10,12,
14,16,18,20,30,40,50,60,80,120,160,200
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.
303-273-8677 (voice)
303-273-8600 (FAX)
rukstales@usgs.gov
This map is intended to summarize the available quantitative information about seismic ground motion hazard in Alaska from geologic and geophysical sources.
Person who carried out this activity:
303-273-8677 (voice)
303-273-8600 (FAX)
rukstales@usgs.gov
Wesson, Robert L., Frankel, Arthur D., Mueller, Charles S., and Harmsen, Stephen C., 1999, Probabilistic Seismic Hazard Maps of Alaska: U.S. Geological Survey Open-File Report 99-36, U.S. Geological Survey, Denver, Colorado.
Calculation of the acceleration values is described in the following
report:
Wesson, Robert, Frankel, Arthur, Mueller, Charles, and Harmsen,
Stephen, 1999, Probabilistic Seismic Hazard Maps of Alaska: U.S.
Geological Survey Open-File Report 99-36, 48 p.
The hazard maps do not consider uncertainty in the underlying
seismicity or fault parameters.
The location of features is based on theoretical calculations of a seismological model for the study area. The location of each point is considered to be correct within the confines of computer accuracy.
Areas outside of Alaska and the Aleutian Islands have been removed.
Polygon and chain-node topology present.
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.
1-888-ASK-USGS (voice)
303-202-4693 (FAX)
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)
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.
A color, printed copy of this data set in map form is available for purchase. Contact the U.S. Geological Survey Information Services, 1-888-ASK-USGS, for pricing and shipping costs.
| 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://greenwood.cr.usgs.gov/pub/i-maps/i-2679/i2679-2.pdf> |
303-273-8677 (voice)
rukstales@usgs.gov
Downloadable geospatial data sets in ARC/INFO export format are available.
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 1.0 Second Period (5% of Critical Damping) in format ARCE (version 7.2.1) Size: 141 KB |
|---|---|
| Network links: |
<http://greenwood.cr.usgs.gov/pub/i-maps/i-2679/ak1hz250.e00.gz> |
303-273-8677 (voice)
303-273-8600 (FAX)
rukstales@usgs.gov
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://geo-nsdi.er.usgs.gov/metadata/map-i/2679/1HZ250.faq.html
Page Contact Information: Peter Schweitzer
Page Last Modified: Monday, 10-Nov-2008 12:18:27 EST