Alaska Volcano Observatory

RESTLESS VOLCANOES

Cleveland
Color Code YELLOW / Alert Level ADVISORY

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Shishaldin
Color Code ORANGE / Alert Level WATCH

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NEWS

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Happy Anniversary, Shishaldin 1967 and 2014!
Posted: January 28, 2015

Shishaldin in June, 2014

Today is a double anniversary of eruptions at one of Alaska’s most active and beautiful volcanoes: Shishaldin.
One year ago, the current period of unrest and low-level Strombolian eruption deep within the summit crater commenced. The first sign of activity was an increased surface temperature detected from satellite. The 2014-2015 eruption has been monitored primarily using AVO’s satellite image tracking system, as the seismic network at Shishaldin has been hampered by technical problems for a portion of this period. AVO also uses a web camera and infrasound detection and ground coupled air waves – essentially the detection of pressure waves in the atmosphere produced by explosions at the volcano – to evaluate and track ongoing activity. The current eruption has not had much impact on the surrounding terrain or air traffic. Localized dustings of ash and ballistics on the flank of Shishaldin attest to the vigor of some of the explosions during the last year. As occurred in 1999, however, Shishaldin is capable of significant explosions that send ash high into the atmosphere, and for that reason AVO remains vigilant for intensification of the activity.

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New Publication on Aniakchak Volcano Available Online
Posted: December 30, 2014

AVO would like to announce a new, richly-illustrated online publication that describes the volcanic geology and geochemistry of one of Alaska’s most spectacular volcanoes, Aniakchak! The USGS has just released Professional Paper 1810: Postglacial Eruptive History, Geochemistry, and Recent Seismicity of Aniakchak Volcano, Alaska Peninsula.

The report presents what is known about the recent eruptive history of this large, explosive volcano and interprets a large geochemical data set and recent seismic data collected by AVO to present a model of the Aniakchak magmatic system.

The full citation and web link to find the PDF copy of both the report and data tables are here.

Bacon, C.R., Neal, C.A., Miller, T.P., McGimsey, R.G., and Nye, C.J., 2014, Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak volcano, Alaska Peninsula: U.S. Geological Survey Professional Paper 1810, 74 p.,http://dx.doi.org/10.3133/pp1810.

Senior author Dr. Charles Bacon is a Senior Research Geologist Emeritus with the U.S. Geological Survey, Volcano Science Center, in Menlo Park, California.

LAST ACTIVITY REPORT

Get these reports emailed to you: USGS VNS

ALASKA VOLCANO OBSERVATORY DAILY UPDATETuesday, January 27, 2015 12:09 PM AKST (Tuesday, January 27, 2015 21:09 UTC)

SHISHALDIN VOLCANO (VNUM #311360)
54°45'19" N 163°58'16" W, Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Clouds have obscured the summit of the volcano for most of the past 24 hours. A faint thermal signal at the summit was observed through clouds, but was evident in only one satellite image. Low-level eruptive activity within the summit crater likely continues. Seismicity remains slightly above background.

CLEVELAND VOLCANO (VNUM #311240)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

The volcano has been obscured by clouds and nothing of note has been observed in satellite data over the past day. No significant activity was detected in seismic or infrasound (air pressure) data.

OTHER ALASKA VOLCANOES

Other Alaska volcanoes show no signs of significant unrest: http://www.avo.alaska.edu/activity/

AVO scientists conduct daily checks of earthquake activity at all seismically-monitored volcanoes, examine web camera and satellite images for evidence of airborne ash and elevated surface temperatures, and consult other monitoring data as needed.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

FOR MORE INFORMATION ON ALASKA VOLCANOES: http://www.avo.alaska.edu

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

FOLLOW AVO ON FACEBOOK: https://facebook.com/alaska.avo

FOLLOW AVO ON TWITTER: https://twitter.com/alaska.avo

CONTACT INFORMATION:
John Power, Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 322-4085

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.