Alaska Volcano Observatory | Home
The Alaska Volcano Observatory (AVO) is a consortium of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the State of Alaska Division of …
Alaska Volcano Observatory | Volcanoes of Alaska
Alaska contains about 140 volcanoes and volcanic fields active within the last 2.6 million years (the Quaternary). About 90 of these volcanoes have been active within the last 11,000 years …
Alaska Volcano Observatory | About AVO
AVO was founded in 1988, and uses federal, state, and university resources to monitor and study Alaska's volcanoes, to forecast and record eruptive activity, and to mitigate volcanic hazards …
Alaska Volcano Observatory | Spurr
Current Activity No new updates for Spurr volcano since August 22, 2025, 11:07 am.
Alaska Volcano Observatory | Webcams
Check out Ashcam GUI: our new tool for viewing webcams.
Alaska Volcano Observatory | Volcano Alert Levels
The Alaska Volcano Observatory uses the USGS alert-level system for volcanic activity, which has two parts: 1. Ranked terms to inform people on the ground about a volcano's status.
Alaska Volcano Observatory | Library
Hazard Alert System: Search AVO’s formal information products – daily updates, weekly updates, information statements, and Volcano Activity Notification/Volcano Observatory Notice for …
Alaska Volcano Observatory | Redoubt
The volcano is composed of intercalated pyroclastic deposits and lava flows and rests on Mesozoic granitic rocks of the Alaska-Aleutian Range batholith [2] [3] .
Alaska Volcano Observatory | Likelihood of Mount Spurr eruption …
The current unrest at Mount Spurr indicates that new magma has intruded into the Earth’s crust beneath the volcano and that the probability of an eruption has increased.
Alaska Volcano Observatory | Geology
The ATL holdings include mainly Holocene-age tephra samples and datasets from many Alaska volcanoes, and also include a reference data set of tephra from the largest eruptions of …