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    • This is a Non-Federal dataset covered by different Terms of Use than Data.gov.

    The 2008 phreatomagmatic eruption of Okmok Volcano, Aleutian Islands, Alaska: Chronology, deposits, and landform changes

    Metadata Updated: July 5, 2023

    Okmok volcano, Aleutian Islands, Alaska, explosively erupted over a five-week period between July 12 and August 23, 2008. The eruption was predominantly phreatomagmatic, producing fine-grained tephra that covered most of northeastern Umnak Island. The eruption had a maximum Volcanic Explosivity Index (VEI) of 4, with eruption column heights up to 16 km during the opening phase. Several craters and a master tuff cone formed in the caldera as a result of phreatomagmatic explosions and accumulated tephra-fall and surge deposits. Ascending magma continuously interacted with an extensive shallow groundwater table in the caldera, resulting in the phreatomagmatic character of the eruption. Syneruptive explosion and collapse processes enlarged a pre-existing lake, created a second, entirely new lake, and formed new, deep craters. A field of ephemeral collapse pits and collapse escarpments formed where rapid groundwater withdrawal removed material from beneath capping lava flows. This was the first significant phreatomagmatic event in the U.S. since the Ukinrek Maars eruption in 1977. This digital data release provides GIS files of field station locations and various geographic features described in the accompanying report.

    Access & Use Information

    Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: No license information was provided.

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    Dates

    Metadata Date April 9, 2015
    Metadata Created Date July 5, 2023
    Metadata Updated Date July 5, 2023
    Reference Date(s) January 1, 2015 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from Alaska Division of Geological and Geophysical Surveys

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date April 9, 2015
    Metadata Created Date July 5, 2023
    Metadata Updated Date July 5, 2023
    Reference Date(s) January 1, 2015 (publication)
    Responsible Party Alaska Division of Geological & Geophysical Surveys (Point of Contact)
    Contact Email
    Guid 276a5c7a-b5cb-43a5-b6e0-5a6e3f25bc0b_source
    Access Constraints Use Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express 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., Access Constraints: 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).
    Bbox East Long -166.463118
    Bbox North Lat 53.953138
    Bbox South Lat 53.199696
    Bbox West Long -168.340761
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 276a5c7a-b5cb-43a5-b6e0-5a6e3f25bc0b
    Harvest Source Id 8f77b6d5-f630-4995-bdf3-0aee7158a7f3
    Harvest Source Title Alaska Division of Geological and Geophysical Surveys
    Licence 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.
    Lineage This lineage was generated by the FGDC CSDGM to 19139 transformation
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-168.340761, 53.199696], [-166.463118, 53.199696], [-166.463118, 53.953138], [-168.340761, 53.953138], [-168.340761, 53.199696]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2008-01-01
    Temporal Extent End 2014-01-01

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