clinopyroxene_EPMA: Clinopyroxene electron probe microanalyses data and metadata glass_EPMA: Glass electron probe microanalyses data and metadata olivine_EPMA: Olivine electron probe microanalyses data and metadata plagioclase_EPMA: Plagioclase electron probe microanalyses data and metadata sample_metadata: Sample location details
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This material is based on Alaska Volcano Observatory work supported by the U.S. Geological Survey in a cooperative agreement with the UAF Geophysical Institute and under Cooperative Agreement No. G19AC00060 to the Alaska State Division of Geological & Geophysical Surveys. We thank the Advanced Instrumentation Laboratory in the College of Natural Sciences and Mathematics at the University of Alaska, Fairbanks, and Ken Severin for making the facility available to researchers and assisting with the instrumentation. We thank Tina Neal, James Beget, and Chris Nye for their dedication and contributions to the Okmok geologic mapping effort. Bering Pacific Ranches Ltd. supported this work through lodging and logistics support. Access to Umnak Island was by charter flights or boat from the Port of Dutch Harbor. Maritime Helicopters and pilots Bill Springer, Rick Farrish, and Jon Combs provided efficient, safe, and professional transportation in the field areas.
Okmok is a frequently active, basaltic to basaltic andesite composition shield volcano, truncated by two nested calderas that are approximately 10 km in diameter, covering the northeastern sector of Umnak Island in the Fox Islands, Eastern Aleutians, Alaska. Umnak Island is located approximately 100 km to the southwest of the City of Unalaska and the Port of Dutch Harbor, and approximately 1,400 km to the southwest of Anchorage, Alaska. Okmok volcano continues to show episodic signs of unrest, suggesting that eruptions will occur in the future. This research describes the nature and character of a rock samples from a past eruption to aid in the discussion of spatial and temporal patterns of Alaska volcanism. In addition, the work supports improvements to eruption scenario forecasts and hazard response.
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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).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.
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.
| Data format: | tabular data in format table |
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https://doi.org/10.14509/30853 |