Mat-Su Times

AVO/USGS Volcanic Activity Notice

Volcano: Tanaga (VNUM #311080)

Current Volcano Alert Level: WATCHPrevious Volcano Alert Level: ADVISORY

Current Aviation Color Code: ORANGEPrevious Aviation Color Code: YELLOW

Issued: Thursday, March 9, 2023, 5:19 PM AKSTSource: Alaska Volcano ObservatoryNotice Number: 2023/A268Location: N 51 deg 53 min W 178 deg 8 minElevation: 5925 ft (1806 m)Area: Aleutians---------------------------------------------Volcano: Takawangha (VNUM #311090)

Current Volcano Alert Level: WATCHPrevious Volcano Alert Level: ADVISORY

Current Aviation Color Code: ORANGEPrevious Aviation Color Code: YELLOW

Issued: Thursday, March 9, 2023, 5:22 PM AKSTSource: Alaska Volcano ObservatoryNotice Number: 2023/A225Location: N 51 deg 52 min W 178 deg 1 minElevation: 4754 ft (1449 m)Area: Aleutians 

Volcanic Activity Summary:

Over the past 48 hours, earthquake activity near Tanaga AND Takawangha volcanoes has been elevated and continues. This sustained activity indicates an increased potential for eruption on Tanaga Island. Therefore AVO is raising the Aviation Color Code to ORANGE AT BOTH VOLCANOES and the Volcano Alert Level to WATCH. If an eruption were to occur, it is uncertain at this stage if it would come from Tanaga or Takawangha. 

AVO analysts continue to monitor the situation closely, and locate events as time permits. Earthquakes are occurring under Tanaga Island at a rate of up to several per minute. The largest event over the past 24 hours was a M3.9 located under Tanaga Volcano. 

No eruptive activity or signs of unrest have been detected in satellite or other monitoring data.

Tanaga is monitored with a local seismic network, a single local infrasound sensor, regional infrasound and lightning sensors, and satellite imagery.  

For current monitoring data: https://avo.alaska.edu/activity/Tanaga.php 

Original source can be found here.