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Alaska Volcano Observatory
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The Alaska Volcano Observatory (AVO) is a joint program of the U.S. Geological Survey (USGS), the Geophysical Institute of the University of Alaska Fairbanks (UAFGI), and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS). AVO was formed in 1988, and uses federal, state, and university resources to monitor and study Alaska's hazardous volcanoes, to predict and record eruptive activity, and to mitigate volcanic hazards to life and property.

AVO has three primary objectives:
  • To conduct monitoring and other scientific investigations in order to assess the nature, timing, and likelihood of volcanic activity;
  • To assess volcanic hazards associated with anticipated activity, including kinds of events, their effects, and areas at risk; and
  • To provide timely and accurate information on volcanic hazards, and warnings of impending dangerous activity, to local, state, and federal officials and the public.

AVO offices are in Anchorage and Fairbanks, Alaska. The Anchorage office is at the USGS, and is the primary point of information dissemination during crises. Fairbanks offices are concentrated at the UAFGI, which serves as the data collection point for most of the seismic and satellite data. AVO is staffed by the equivalent of about 22 full-time scientists, technicians, and administrators. Managerial responsibility for AVO rests with the Scientist-in-Charge, a USGS employee in Anchorage, and the Coordinating Scientist in Fairbanks, a UAFGI or ADGGS employee.

Great Sitkin
Cover of the hazard report for Great Sitkin Volcano
In support of public land-use planning, development of emergency response plans, and general public awareness of the nature of volcanic activity in Alaska, AVO is responsible for assessing the full range of potential hazards at specific volcanic centers. This effort involves studying a volcano to determine the style and frequency of past eruptions, and potential impacts of future activity. Hazards assessments include descriptions of the history of a given volcano, explanations of likely eruption scenarios, and determination of probable impact zones for the range of expected hazards. Ultimately, hazards assessments will be published for all seismically monitored volcanoes. Those which have been completed to date are available as PDF files in the "library" section of this site.

Alaska's active volcanoes offer superb opportunities for basic scientific investigations of volcanic processes. An important component of AVO's program is to conduct research at selected volcanic centers. The scope of this research includes:
  • Basic geological mapping to determine eruptive histories of active volcanoes,
  • Geochemical characterization and modeling of diverse magmatic systems,
  • Investigations of hydrologic hazards associated with eruptions of snow and ice-clad volcanoes,
  • Documentation and analysis of eruptive processes,
  • Geophysical exploration of the interiors of volcanoes and mechanisms of eruption, and
  • Development of new instrumentation to aid in prediction and interpretation of volcanic unrest.
Results of these studies contribute significantly to accurate completion of volcanic hazards assessments and to the continual improvement AVO's monitoring and predictive capabilities.

Map of Augustine GPS and Seismic Stations
The backbone of AVO's volcano monitoring program consists of networks of continuously recording seismometers installed at selected volcanoes. Seismic data
Seismometer installed at Mt. Spurr
are relayed to AVO facilities in Fairbanks and Anchorage where they are analyzed both automatically and by analysts. Initially, AVO concentrated its monitoring efforts on the four Cook Inlet volcanoes because they are closest to Alaska population centers. In response to the increasing hazard to aviation from volcanic ash, AVO started a program of expansion in 1996 to other volcanoes in the Aleutian Islands and on the Alaska Peninsula, and now monitors more than 20 volcanoes. Volcanic unrest, caused by the migration of magma and other fluids through the earth's crust, is heralded by increased seismicity, often months to weeks before eruption. Because the seismometers provide a continuous data stream the onset of explosive eruptions can be detected quickly in most cases and appropriate warnings issued. An electronic alarm system is employed during non-business hours.

Landsat 5 view of 1986 Augustine eruption.
Satellite imagery provides information which complements seismic monitoring at those volcanoes with seismic networks, and is the only source of routine monitoring information at those without. AVO analyzes available satellite data twice daily for thermal anomalies and ash plumes at about 80 volcanoes in the north Pacific. Thermal anomalies at volcanic vents have been detected up to several weeks before large eruptions. Volcanic ash erupted into the atmosphere is a serious hazard to jet aircraft because it can cause their engines to shut down as it is ingested. By analyzing satellite imagery and working with the National Weather Service to predict where winds will carry the ash, AVO assists the Federal Aviation Administration in warning aircraft of areas to avoid.

Space-based deformation monitoring is an emerging technique. AVO operates a network of telemetered GPS receivers at Augustine Volcano, in lower Cook Inlet that provide a continuous record of ground deformation. AVO also conducts periodic field-based GPS surveys as well as measuring deformation with satellite radar interferometry (InSAR) techniques. These techniques are providing important information about inflation and deflation of volcanoes, but are not yet evolved enough for routine real-time monitoring of many volcanoes.

During eruptions and under conditions of heightened concern, the crisis center at AVO-Anchorage becomes directly responsible for all AVO activities concerning the emergency. AVO is the principal point of contact for information on volcanic activity and hazards assessment for government agencies, the media, and the public. At all times and especially during volcanic emergencies, AVO maintains close communication links with other critical agencies such as National Weather Service, Federal Aviation Administration, and Alaska State agencies who all issue additional hazard messages and guidance as needed.

AVO's component agencies have a statutory obligation to distribute information regarding volcanic activity in Alaska. Currently, AVO distributes a weekly summary of volcanic activity in Alaska each Friday. During eruptions, written statements that include the location, time, size of the eruption, and narrative descriptions of projected plume paths, are distributed by AVO to federal, state, and local government agencies, the public, the media, commercial airlines, and others by pre-programmed facsimile machines and electronic mail systems. Anyone can subscribe to receive these messages through the Volcano Notification Service by signing up at this web site: http://volcanoes.usgs.gov/vns/.

Additional notices and updates are prepared as needed, depending on changes in volcanic activity or hazards. AVO also maintains two recorded message lines (numbers) which are updated with summations of the latest status of volcanic activity. AVO answers many calls from the public and as time allows, gives interviews with media, tours of the AVO facility, and deliver presentations to schools and other groups. The AVO web site is a source of selected images from our vast photo and video library of volcanic phenomena through the years.

To assist our partners responsible for reporting on volcanoes in the Russian Far East, AVO's web page mirrors alert messages from the Kamchatka Volcanic Eruption Response Team and the Sakhalin Volcanic Eruption Response Team. During large Russian eruptions in Kamchatka or the Kuriles, AVO scientists may assist in analysis of eruption clouds to inform the aviation community of airborne ash hazard.

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URL: www.avo.alaska.edu/about/index.php
Page modified: November 14, 2019 12:08
Contact Information: AVO Web Team

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