Newest Volcano Notice Including Little Sitkin

ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
U.S. Geological Survey
Thursday, July 14, 2022, 2:40 PM AKDT (Thursday, July 14, 2022, 22:40 UTC)

Upgrades to a satellite telemetry link have improved transmission of local monitoring data from the Little Sitkin and Semisopochnoi volcano networks. After an extended evaluation period following the 2021 field season, the Alaska Volcano Observatory (AVO) now considers the telemetry link sufficiently reliable to confidently monitor seismic unrest at these volcanoes. With the establishment of robust data transmission, Little Sitkin volcano is being moved from UNASSIGNED to a Volcano Alert Level of NORMAL and an Aviation Color Code of GREEN. Semisopochnoi volcano remains in an elevated state of unrest with a Volcano Alert Level of ADVISORY and Aviation Color Code YELLOW.

LITTLE SITKIN (VNUM #311050)
51°57'11" N 178°32'8" E, Summit Elevation 3898 ft (1188 m)
Current Volcano Alert Level: UNASSIGNED
Current Aviation Color Code: UNASSIGNED

The Avation Color Code and Alert Level changed from UNASSIGNED to GREEN/NORMAL due to an upgraded communication link to instrumental monitoring data. 

Little Sitkin is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.

SEMISOPOCHNOI (VNUM #311060)
51°55'44" N 179°35'52" E, Summit Elevation 2625 ft (800 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Semisopochnoi remains in a state of unrest with an Aviation Color Code and Alert Level YELLOW/ADVISORY. Upgrades in the communication link to instrumental monitoring data have established more reliable data transmission for improved local monitoring. These changes will enable AVO to designate Semisopochnoi with an Aviation Color Code and Alert Level GREEN/NORMAL rather than UNASSIGNED during future periods of quiescence. 

Semisopochnoi is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.

OTHER ALASKA VOLCANOES

Information on all Alaska volcanoes is available at: http://www.avo.alaska.edu.

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

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:

Michelle Coombs, Scientist-in-Charge, USGS mcoombs@usgs.gov (907) 786-7497

David Fee, Coordinating Scientist, UAFGI dfee1@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.