border: A polygon shapefile that provides generalized outlines of the geographic areas noted within this report. Historic volcanic vents occur in many places throughout Alaska. The border file is a multipart polygon that roughly outlines groups of adjacent vents. The vent groups are based on a calculated buffer of geographic proximity. This file is intended provide a broad overview of where vents occur throughout the state and should not be used for any other purpose. AK_Q_vents: A table that lists basic information about each vent; the accompanying manuscript provides a comprehensive list and description of each field. full_citation: A table of citation information for each reference used in vent reference list; the accompanying manuscript provides a comprehensive list and description of each field in this table. vent_reference: A table that joins the list of vents to the applicable references in the "full_citation" table. The accompanying manuscript provides a comprehensive list and description of each field in this table.
Cameron, C.E., and Nye, C.J., 2014, Preliminary database of Quaternary vents in Alaska: Miscellaneous Publication MP 153, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
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 WGS 84.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257223563.
The authors thank Janet Schaefer (ADGGS/AVO), Charlie Bacon (USGS), Tina Neal (USGS/AVO), Michelle Coombs (USGS/AVO), Brian Jicha (University of Wisconsin Madison), Gene Yogodzinski (University of South Carolina), and Pete Stelling (Western Washington University) for providing unpublished vent data and/or review of volcanic centers.
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The Alaska Volcano Observatory (AVO) uses an informal set of names for about 140 'volcanoes'. Some names refer to large, complex volcanic centers, while others indicate only a specific cone. This publication expands the list of 140 volcanoes to include all volcanic vents where magma has reached the surface over the past 2.6 million years, and currently comprises 1,187 entries. This database of all known (published, or unpublished with permission) Quaternary volcanic vents was developed to better describe the nature and character of Quaternary volcanism in Alaska and specifically to aid in the discussion of spatial and temporal patterns of Alaska volcanism. This list is a preliminary starting point, and we hope that it is updated and expanded by the addition of newly discovered subaerial and submarine vents. We invite the community of volcanologists who study Alaska volcanism to help us develop this database by adding new vents as they are discovered and by improving the geologic descriptions of known vents as new information becomes available.
This database attempts to note all the locations where magma is known to have reached the surface in the last 2.6 million years. Given the spotty coverage of geologic mapping, geophysical studies, geochemical analyses, and geochronology in Alaska, this list is incomplete. Vent locations come from published and unpublished sources, and are subject to limitations of mapping scale and various mapping priorities, as well as problems such as erosion, glaciation, or destruction of the vent. An additional uncertainty arises around eroded domes or plugs-whether or not many of these features ever had a vent that made it to the surface is often unknown. Largely because of unavailable data, this list also does not adequately address the problems of trying to determine locations for vents that are now obscured or obliterated (during caldera formation, perhaps). There are also complications in determining the criteria that might be used to either group or separate vents. The accompanying report includes discussion of issues that complicate classification of Alaska's volcanic vents. The information in this publication release has been reviewed for consistency and completeness by several geologists who are familiar with the subject matter.
In some case the location coordinate listed in spreadsheets may provide a higher degree of location precision than is appropriate. To determine degree of uncertainty associated with the location of each vent users should review the 'Loc_conf' value in the spreadsheet and the accompanying report.
This list is a preliminary starting point, and we hope that it is updated and expanded by the addition of newly discovered subaerial and submarine vents. We invite the community of volcanologists who study Alaska volcanism to help us develop this database by adding new vents as they are discovered and by improving the geologic descriptions of known vents as new information becomes available.
not applicable
Are there legal restrictions on access or use of the data?
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- 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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MP 153
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| Data format: | ASCII tabular files |
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| Network links: |
<http://dx.doi.org/10.14509/27357> |
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