Printer friendly versionAVO/USGS Volcanic Activity Notice
Current Volcano Alert Level: UNASSIGNED
Previous Volcano Alert Level: ADVISORY
Current Aviation Color Code: UNASSIGNED
Previous Aviation Color Code: YELLOWIssued:
Thursday, May 28, 2015, 1:52 PM AKDT (20150528/2152Z)Source:
Alaska Volcano ObservatoryNotice Number:
N 51 deg 55 min E 179 deg 35 minElevation:
2625 ft (800 m)Area:
Aleutians AlaskaVolcanic Activity Summary
: A decline in seismicity over the last few months and no sign of activity in daily satellite images prompts AVO to downgrade Semisopochnoi volcano from Aviation Color Code YELLOW
and Volcanic Alert Level ADVISORY to UNASSIGNED.
Following a brief seismic swarm in June and July, 2014, an increase in seismicity at Semisopochnoi seismic stations was recorded in January 2015. Numerous small earthquakes, most with magnitudes less than 1 over the next several months led AVO to include Semisopochnoi in the March 20, 2015 Weekly Update. On March 25, 2015, citing increased earthquake activity including brief periods of tremor, AVO raised the Aviation Color Code and Volcano Alert Level to YELLOW
/ADVISORY. Over the next two months seismic levels have declined and no activity has been observed in daily satellite images or other remote sensing data.
AVO will continue to monitor Semisopochnoi seismic data and evaluate daily satellite images. Recent Observations:
[Volcanic cloud height] Unknown
[Other volcanic cloud information] UnknownContacts:
Chris Waythomas, Acting Scientist-in-Charge, USGS
firstname.lastname@example.org (907) 786-7497
Jeff Freymueller, Coordinating Scientist, UAFGI
email@example.com (907) 322-4085
A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at
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.