AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
Summary | Color Code Definitions | Webcams | Webicorders | RSAM | Activity Notifications | Notification Search | Great Sitkin | Cleveland | Pavlof | Semisopochnoi 
You are here: Home > Current Volcanic Activity


U.S. Geological Survey
Friday, August 29, 2008, 4:01 PM AKDT (Saturday, August 30, 2008, 00:01 UTC)

52°10'9" N 175°30'41" W, Summit Elevation 1030 ft (314 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Seismic activity at Kasatochi volcano continues to slowly decline following the eruptions on August 7. Possible intermittent tremor occurred for several hours on August 27 and was detected by the AVO seismic network on Great Sitkin Island 25 miles west of Kasatochi. Satellite views were cloudy this week.

The volcano remains in a restless condition and is hazardous to approach. Further explosive activity remains possible.

53°23'49" N 168°9'58" W, Summit Elevation 3520 ft (1073 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Seismicity at Okmok volcano has declined and significant ash plumes have not been observed since August 19. The Aviation Color Code/Alert Level was reduced to YELLOW/Advisory on August 27. A clear satellite view on August 28 showed a weak steam plume and a weak thermal anomaly. Although the level of seismicity has declined and it appears that ash is no longer being erupted, it is possible for vigorous ash emissions to resume at any time.

Visual observations of the caldera floor made on August 23 indicate that low level eruptive activity has also likely stopped. It is possible for vigorous ash emissions to resume at any time.

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

Satellite views were most cloudy this week. A weak thermal anomaly was detected on August 24. The lack of recent activity prompted AVO to lower the Aviation Color Code/Alert Level to YELLOW on August 25.

Eruptive activity may resume at Cleveland volcano without warning.


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

Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131

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.
Contact AVO Privacy Accessibility Information Quality FOIA
URL: avo.alaska.edu/activity/report.php
Page modified: December 2, 2016 10:12
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.