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Open-File Report 00-519

Preliminary Volcano-Hazard Assessment for Aniakchak Volcano, Alaska

By Christina A. Neal, Robert G. McGimsey, Thomas P. Miller, James R. Riehle, and Christopher F. Waythomas

Thumbnail of and link to report PDF (3.1 MB)Summary

Aniakchak is an active volcano located on the Alaska Peninsula 670 kilometers southwest of Anchorage. The volcano consists of a dramatic, 10-kilometer-diameter, 0.5 to 1.0-kilometer-deep caldera that formed during a catastrophic eruption 3,500 years ago. Since then, at least a dozen separate vents within the caldera have erupted, often explosively, to produce lava flows and widespread tephra (ash) deposits. The most recent eruption at Aniakchak occurred in 1931 and was one of the largest explosive eruptions in Alaska in the last 100 years. Although Aniakchak volcano presently shows no signs of unrest, explosive and nonexplosive eruptions will occur in the future. Awareness of the hazards posed by future eruptions is a key factor in minimizing impact.

First posted May 15, 2001

For additional information, contact:
Alaska Science Center
U.S. Geological Survey
4210 University Dr.
Anchorage, AK 99508

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Suggested citation:

Neal, Christina A.; McGimsey, Robert G.; Miller, Thomas P.; Riehle, James R.; Waythomas, Christopher F., 2000, Preliminary Volcano-Hazard Assessment for Aniakchak Volcano, Alaska: U.S. Geological Survey Open-File Report 00-519, 42 pp.,


Summary of volcano hazards at Aniakchak volcano


Location of Aniakchak volcano

Prehistoric eruptive activity at Aniakchak volcano

Historical eruptions at Aniakchak volcano

Volcano hazards at Aniakchak

Could another caldera-forming eruption occur at Aniakchak?

Event frequency and risk at Aniakchak volcano

Volcano monitoring and eruption response at Aniakchak

Preparing for eruptions at Aniakchak volcano


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