ALASKA VOLCANO OBSERVATORY DAILY UPDATE

U.S. Geological Survey

Tuesday, September 29, 2020, 12:25 PM AKDT (Tuesday, September 29, 2020, 20:25 UTC)

Occasional small earthquakes were detected at Great Sitkin over the past day. No activity was observed in clear satellite and web camera views.



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

Small earthquakes detected over the past day. No activity was observed in cloudy satellite and web camera images.



The level of unrest at Pavlof can change quickly and the progression to eruptive activity can occur with little or no warning. AVO continues to monitor Pavlof closely and will provide any new information about the status of the volcano when or if it becomes available.



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

Occasional small earthquakes detected over the past day. No activity was detected on the regional infrasound network or in mostly clear satellite views.



Semisopochnoi is monitored by local seismic sensors, satellite data, and regional infrasound and lightning detection instruments. An infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a slight delay (approximately 13 minutes) if atmospheric conditions permit.

(VNUM #311120)52°4'35" N 176°6'39" W, Summit Elevation 5709 ft (1740 m)Current Volcano Alert Level: ADVISORYCurrent Aviation Color Code: YELLOW(VNUM #312030)55°25'2" N 161°53'37" W, Summit Elevation 8261 ft (2518 m)Current Volcano Alert Level: ADVISORYCurrent Aviation Color Code: YELLOW(VNUM #311060)51°55'44" N 179°35'52" E, Summit Elevation 2625 ft (800 m)Current Volcano Alert Level: ADVISORYCurrent Aviation Color Code: YELLOWInformation 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.phpSUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/FOLLOW AVO ON FACEBOOK: https://facebook.com/alaska.avoFOLLOW AVO ON TWITTER: https://twitter.com/alaska_avoMichelle Coombs, Scientist-in-Charge, USGSmcoombs@usgs.gov (907) 786-7497David Fee, Coordinating Scientist, UAFGIdfee1@alaska.edu (907) 322-4085The 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.