Schaefer, J.R., Cameron, C.E., and Nye, C.J., 2011, Historically active volcanoes of Alaska: Miscellaneous Report MP 133 v. 1.1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.
This is a Point data set.
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.001. Longitudes are given to the nearest 0.001. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is World Geodetic System of 1984.
The ellipsoid used is World Geodetic System of 1984.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.25722210088.
The volcano names chosen reflect the common use name used by staff at the Alaska Volcano Observatory.
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The idea for this data set is based on the publication: "Nye, C.J., 1994, Aleutian Arc Volcanoes:Alaska Division of Geological & Geophysical Surveys Public Data File 94-54.
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The purpose of this dataset is to document the location and most recent eruptive events of the historically active volcanoes of Alaska.
Cameron, C.E., and Alaska Volcano Observatory , 2005, Geologic Database of Information on Volcanoes in Alaska (GeoDIVA) accessed through the Alaska Volcano Observatory website volcano information pages, <http://www.avo.alaska.edu/volcano>.
Data sources used in this process:
See process steps.
The horizontal positions are reported to as many decimal degrees (at least 2, and up to 5) as the authors feel the location can be confidently known. Longitude and latitudes were compiled from existing published resources and plotted using a GIS to visually verify accuracy. Where published locations of volcanic features appeared inaccurate, new locations were generated by creating a point on USGS digital topographic maps (using the largest scale available, 1:63,000 or 1:250,000) within the GIS.
This data lists the historically active volcanoes of Alaska, their location in latitude/longitude decimal degrees, and the year of the last major eruptive event.The 52 volcanoes listed meet at least one of the following criteria since 1700 CE: (1) documented, unquestioned eruption, or (2) a strongly suspected eruption, often an eruption documented in the historical account with very little information (current geologic knowledge must not contradict the eruption account), or (3) persistent (usually on the order of decades, but certainly longer than several months) fumaroles, with temperatures (where measured) within ~10Â°C of the boiling point, or (4) significant, measured, volcanic-related, non-eruptive deformation, (5) documented earthquake swarm with strongly suspected volcanic cause. For the purposes of this dataset a major eruptive event is considered to be one in which juvenile lava erupt as a lava flow or dome or as an explosive column reaching an altitude of several thousand meters above the vent
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