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April 19th - anniversary of Shishaldin 1999 and Pavlof 1986!

Ground-coupled airwaves and explosion signals at Shishaldin

5th anniversary of the Redoubt 2009 eruption

Loss of Critical Volcano Monitoring Information in Alaska


Report released: Geochemical investigations of the hydrothermal system on Akutan Island, July 2012

24th Anniversary of the 1989-90 eruption of Redoubt Volcano

Veterans Day slideshow

Call for images from active and retired service members!

AVO operations during lapse of federal government appropriations

New Tool for Reporting Alaska Volcanic Ash Fall Allows Residents to Assist Scientific Monitoring

25 years monitoring Alaska volcanoes - press release

AVO slideshow for Veterans Day

Large ash eruptions: when volcanoes reshape valleys -- free public lecture

Father Hubbard and the history of exploration in the Valley of Ten Thousand Smokes - free lecture

Remote sensing and volcanoes - free public lecture

The Great Eruption of 1912 - free public lecture

Infrasound Detection of Volcanic Explosions

Archaeology of Katmai area and the impact of past eruptions - free public lecture

Historical Photography of the Great 1912 Eruption - free public lecture

Catastrophic Eruptions and People -- free public lecture

Eruption of an Island Volcano: Kasatochi, 2008 -- free public lecture

Exploring the Plumbing System of Katmai Volcanoes

Exploration of Katmai and the Valley of Ten Thousand Smokes - free public lecture

Commemorative presentation in Kodiak: Be Prepared!

Earthquakes Below Alaskan Volcanoes - free public lecture

DisaStory - A Day of Oral History

1912 Katmai Eruption Children's Program

Monitoring Alaska's Volcanoes - free public lecture

Landmark volcano study: Katmai Centennial Perspectives free download

Special activities on AVO's website for 1912 centennial

Alaska Park Science - Volcanoes of Katmai and the Alaska Peninsula

AVO at the Alaska Aviation Trade Show and Conference May 5-6

The Great Katmai Eruption of 1912 - a free lecture in Anchorage: April 24, 2012

The Great Katmai Eruption of 1912: A Century of Research Tracks Progress in Volcano Science

April 25 -- The Novarupta - Katmai 1912 eruption: a free lecture in Fairbanks by Judy Fierstein

Summer lecture series on Alaskan volcanism

Poster contest celebrates anniversary of Katmai eruption!

Mark your calendar: April 24 public lecture on the great Novarupta-Katmai eruption of 1912

An important volcanic anniversary in Alaska!

PUBLISHED: The 2009 Eruption of Redoubt Volcano, Alaska

2011 Alaska Interagency Operating Plan for Volcanic Ash Episodes now available

How does Cleveland's lava dome compare to Redoubt's 2009 lava dome?

Alaska Volcanoes Guidebook for Teachers

New Fact Sheet on Kasatochi

How big is the 2009 Redoubt lava dome?

New map: Historically active volcanoes of Alaska

Steaming at Augustine

Sarychev Volcano: Active Volcanoes of the Kurile Islands

Footage of Alaska's Redoubt Volcano taken on Monday, March 23, 2009.

Pre-eruption footage of Redoubt Volcano, Saturday, March 20, 2009

Redoubt Volcano B-Roll Footage

Kasatochi 2008 eruption summary

6th Biennial Workshop on Subduction Processes emphasizing the Kurile-Kamchatka-Aleutian Arcs Geophysical Institute, University of Alaska, Fairbanks, Alaska

Chiginagak volcano's acid crater-lake continues to supply acidic, metal-laden water to salmon spawning habitat on the Alaska Peninsula


20 years of AVO

Viewing earthquake information for Alaska volcanoes

Pavlof webcam added

Activity at Pavlof volcano

Pavlof thermal anomaly

AVO Scientists present at U.S. Department of Education Teacher-to-Teacher Workshop

Cleveland webcam available

Activity at Cleveland volcano

Cleveland satellite images

Sheveluch Eruption

U.S. Geological Survey's alert notification system for volcanic activity

KVERT Volcanic Warnings Ceased

New alert system for volcanic activity

Three new webcams added

AGU presentations requested

New webcam available

Loss of Critical Volcano Monitoring Information in Alaska
Loss of Critical Volcano Monitoring Information in Alaska
Posted: January 29, 2014

The Alaska Volcano Observatory (AVO) has experienced numerous seismic station failures and our ability to monitor activity at some volcanoes has failed or is heavily impaired. Monitoring instruments at Aniakchak Volcano can no longer seismically monitor unrest at the volcano. The final Aniakchak station failure was confirmed on January 23. As a result, AVO is unable to (1) assess whether this volcano may be building towards an eruption and (2) quickly confirm or dismiss reports of activity. Because this volcano is no longer seismically monitored, it will move from volcano alert level Normal and Aviation Color Code Green to "unassigned". As at other volcanoes without real-time seismic networks, AVO will continue to use satellite and infrasound data, and reports from pilots and ground observers to detect signs of eruptive activity.

Aniakchak Volcano is located on the Alaska Peninsula about 670 km (416 mi) southwest of Anchorage, Alaska in the Aniakchak National Monument. The volcano is a 10-km-wide (6 mi), 0.5- to 1.0-km-deep (1,640 to 3,281 ft) caldera that has been the source of many violent, explosive eruptions in the past 1,000 years. The last eruption at Aniakchak occurred in 1931 producing a large ash cloud that extended over much of the Alaska Peninsula and south-central Alaska and is the second largest explosive eruption historically in Alaska.

AVO has also experienced numerous seismic station failures at Fourpeaked, Isanotski, Fisher, Shishaldin, Westdahl, and Gareloi volcanoes and many of the stations that continue to work provide data only intermittently. Because we have lost the capacity to reliably identify and locate earthquakes and other seismic indicators of unrest, our ability to monitor volcanic activity and forecast eruptions in advance at these volcanoes is heavily impaired. These volcanoes currently remain on our list of seismically monitored volcanoes because we maintain a minimal capability to detect anomalous activity through intermittent data transmission or at least one functional station. Although we may be able to detect an eruption seismically, we may not be able to identify precursory seismicity and provide advance warning. Monitoring systems at Wrangell, Little Sitkin, and Semisopochnoi volcanoes failed in prior years and have not been restored. The highest priority volcanoes in Alaska are Spurr, Redoubt, Augustine, Akutan, and Makushin; networks on these volcanoes are all operating at sufficient levels to provide warnings of impending eruptions should they follow the expected patterns of activity.

See seismic network status map here: http://www.avo.alaska.edu/map/seismic_network_health.php

The status of the impaired networks may change in coming weeks and months. Seismic stations are partially solar-powered and some may resume operating as daylight hours increase in the spring. AVO will continue to attempt repairs as conditions permit.

Seismometers provide information on earthquake activity that occurs within and beneath active volcanoes. Increased earthquake activity is often the earliest identifiable precursor to a volcanic eruption, and changes in earthquake activity provide the principal scientific information used to provide advance warning of associated hazards. These warnings are used by federal, state, and municipal governments, the airline and fishing industries, local businesses, and citizens to make informed decisions to properly address hazards associated with volcanic eruptions. The principal hazard from these volcanoes is airborne volcanic ash to overflying aircraft following both local and international air routes. Additional hazards include ash fall, lahars, and other rapidly flowing mixtures of hot fragments, fluids, and gases.

We continue to monitor all Alaskan volcanoes with satellite and regional infrasound data. Additionally some volcanoes also are monitored with real-time GPS and webcams. Although we cannot forecast eruptions with these data, we may detect eruptions with a delay of tens of minutes to hours in some cases. However poor weather, common in the North Pacific, can also prohibit detection of significant eruptions using these alternate data sources.

VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu
URL: www.avo.alaska.edu/news.php
Page modified: January 28, 2014 18:55
Contact Information: AVO Web Team

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