border: A polygon shapefile that provides a generalized outline of the geographic area described by this report. caldera-rim: outline of the caldera rim rim-buffer-10km-40km: A shapefile outline of the caldera rim, 10km buffer, and a 40km buffer. unimak-island-image: Unimak Island shaded relief image, GeoTIF format
Stelling, P.L., Beget, J.E., Gardner, J.E., and Schaefer, J.R., 2014, Preliminary volcano-hazard assessment for Fisher volcano, Unimak Island, Alaska: Report of Investigation RI 2014-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000001
Ordinates (y-coordinates) are specified to the nearest 0.000001
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 1/294.9786982.
|10||Area likely to be affected by pyroclastic flows and surges during small- to moderate-sized eruptions, and maximum likely runout of large debris avalanches.|
|40||Maximum extent of pyroclastic flows that could occur during a large eruption similar to caldera-forming events that occurred ~9,400 years ago|
The information required to determine areas likely to be affected by pyroclastic flows and the surge ranges was derived from many sources. A comprehensive list of references is provided in the accompanying report.
This report is part of a series of volcano hazard assessments being prepared by the Alaska Volcano Observatory. The reports are intended to describe the nature of volcanic hazards at Alaska volcanoes and show the extent of hazardous areas with maps, photographs, and other appropriate illustrations. The reports are preliminary and subject to revision as new data become available.
U.S. Geological Survey (USGS), EROS Data Center, 1999, National Elevation Dataset: U.S. Geological Survey, Sioux Falls, SD.
Data sources used in this process:
These geospatial data files replicate figures provided in the accompanying report. They are intended to be used for solely for illustrative purposes. The report and figures were reviewed by several geologists familiar with the subject matter. We incorporated the reviewers' suggestions into the final draft.
The cell size of the 2-arc-second NED data in Alaska is approximately 60 meters horizontally. Based on the digitizing scale and uncertainties in interpretation of the shaded relief image, the estimated horizontal accuracy of the lines likely in the range of 180 meters
This dataset depicts visible and interpreted features that are distinguishable at a scale of 1:500,000. The reader is cautioned that these files are solely intended to provide general guidance and to facilitate communication.
Are there legal restrictions on access or use of the data?
- This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
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The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
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|Data format:||Shapefiles, GeoTIFF raster file|