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The Alaska Volcano Observatory (AVO) is a joint program of the United States 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).
RESTLESS VOLCANOES
Cleveland
Color Code YELLOW / Alert Level ADVISORYvolcano image
Full details ...
Shishaldin
Color Code YELLOW / Alert Level ADVISORYvolcano image
Full details ...

NEWS
New publication highlights the importance of ash scrubbing in the evaluation of hazards from explosive eruptions
Posted: January 13, 2016

Phreatomagmatic eruption at Okmok, 3 Aug 2006

Okmok volcano, located on Umnak Island in the eastern Aleutian Islands, Alaska, erupted explosively in July-August 2008 from vents within its 2050-year-old caldera. Water-magma interaction was an important process in the 2008 Okmok eruption, causing efficient fragmentation that produced large amounts of fine ash throughout the five weeks. This paper describes the stratigraphy, distribution, and grain size, shape, and composition characteristics of the deposits of the 2008 Okmok eruption. Understanding the production and deposition of fine ash in the 2008 Okmok eruption is important for hazard assessment during similar eruptions in Alaska and for the development of a better understanding of phreatomagmatism and violent mafic eruptions.
Unema, J.A., Ort, M.H., Larsen, J.F., Neal, C.A., and Schaefer, J.R., 2016, Water-magma interaction and plume processes in the 2008 Okmok eruption, Alaska: GSA Bulletin, 15 p., doi:10.1130/B31360., abstract available here.

LAST ACTIVITY REPORT
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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
Saturday, February 6, 2016 12:49 PM AKST (Saturday, February 6, 2016 21:49 UTC)


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

Nearly continuous, low-level seismic tremor, as well as small discrete events, continued during the past 24 hours at levels above background for Shishaldin. No activity was observed in mostly cloudy satellite images.

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

No significant activity observed in partly cloudy satellite images during the past 24 hours and no unusual seismicity was detected. The web camera at Cleveland remains inoperable.

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/

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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.
NEWS

IS ASH FALLING?

RUSSIAN VOLCANO INFORMATION

OUTSIDE LINKS
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URL: www.avo.alaska.edu/index.php
Page modified: November 15, 2014 16:35
Contact Information: AVO Web Team

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