AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
About Alaska's Volcanoes | Hazards from Alaska's Volcanoes | Map & Alphabetical List | Interactive Map | Eruption Search | Volcano Search 
You are here: Home > Volcano Information

Great Sitkin reported activity

GREAT SITKIN LINKS

SAMPLES

Webicorders

Webcams
EVENT SPECIFIC INFORMATION

Event Name : Great Sitkin activity 2020

Start:February 26, 2020 ± 1 MonthsObserved

Seismicity with no confirmed eruption: BibCard
Eruption Type:Not an eruption.
Other""

Description: Beginning in early 2020, earthquake activity increased at Great Sitkin Volcano. On February 26, AVO elevated the Aviation Color Code and Volcano Alert Level to YELLOW/ADVISORY, stating that earthquake activity was above background levels, and there had been no evidence of eruptive activity in geophysical data streams or in satelilte observations. A relatively large magnitude 3.5 earthquake occurred at Great Sitkin on March 6. It was located approximately 1 km east-southeast of the summit at shallow depths (not more than 2 km below sea level). After the quake, seismic activity returned to lower levels, and no eruptive activity has been detected in infrasound or satellite data. Another relatively large, M 5.3 earthquake occurred at 8:59:55.004 UTC, July 15, 2020 about 55 miles (90 km) west-northwest of Great Sitkin volcano. The earthquake was about 5 miles (8.5 km) deep and registered clearly on AVO seismic networks in the region including those on Great Sitkin, Kanaga, and Tanaga volcanoes. The earthquake does not appear to be related to volcanic activity and is most likely tectonic in origin.

Seismicity declined through the late summer and fall, and on October 21, 2020, AVO lowered the Aviation Color Code and Volcano Alert Level to GREEN/NORMAL.

Contact AVO Privacy Accessibility Information Quality FOIA
URL: avo.alaska.edu/volcanoes/activity.php
Page modified: March 30, 2017 14:36
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.