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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
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Shishaldin
Color Code YELLOW / Alert Level ADVISORYvolcano image
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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
Wednesday, February 10, 2016 11:56 AM AKST (Wednesday, February 10, 2016 20:56 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

The level of seismic activity has changed little over the past day remains above background levels. The ongoing seismic activity is characterized by low-level seismic tremor, small discrete events, and very small explosions. 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

Nothing noteworthy observed in mostly cloudy satellite images during the past day. No unusual seismic activity was detected.

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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