The Alaska Volcano Observatory (AVO) raised the Aviation Color Code for Shishaldin volcano to ORANGE and the Alert Level to WATCH on October 17, 2019.
Satellite observations indicated that a lava effusion event began on October 13 and is likely continuing. The activity is confined to the summit area at this time.
Low-level seismicity continues to be observed on the local network. The volcano was obscured by cloudy weather in the most recent satellite and web camera images.
Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.
Shishaldin on August 15, 2019. Credit: USGS/AVO
The beautifully symmetrical volcano of Shishaldin is the highest and one of the most active volcanoes of the Aleutian Islands. The 2857-m-high (9 379 feet), glacier-covered volcano is the westernmost of three large stratovolcanoes along an E-W line in the eastern half of Unimak Island.
The Aleuts named the volcano Sisquk, meaning "mountain which points the way when I am lost." A steady steam plume rises from its small summit crater. Constructed atop an older glacially dissected volcano, it is Holocene in age and largely basaltic in composition.
Remnants of an older ancestral volcano are exposed on the west and NE sides at 1 500 -1 800 m (4 920 - 5 900 feet) elevation. There are over two dozen pyroclastic cones on its NW flank, which is blanketed by massive aa lava flows.
Frequent explosive activity, primarily consisting of strombolian ash eruptions from the small summit crater, but sometimes producing lava flows, has been recorded since the 18th century. (GVP)
Featured image: View of Shishaldin Volcano, with Isanotski and Roundtop volcanoes in the background. Credit: USGS/AVO
February 26, 2021
Heavy snow has blanketed many parts of Russia in the past few days, cutting power to more than 30 000 people and leaving various regions and cities struggling to deal with the extreme weather. Thousands of people have been affected, with others having to dig their...
February 26, 2021
Heavy snow has been falling intermittently in Hokkaido, Japan, since Tuesday, February 23, 2021, with Iwamizawa city recording its second-highest snowfall of 2.05 m (6.7 feet) on Thursday, 25. It resulted in disruptions in the city, particularly in train services...
February 25, 2021
This is the 6th paroxysmal eruptive episode at Etna volcano, Italy since February 16, 2021. After 5 impressive paroxysms, the activity at the volcano intensified again at 19:00 UTC on February 24 and evolved into another spectacular event. Video courtesy Gio Giusa...
February 24, 2021
Radioactive cesium fivefold higher the permitted levels have been detected in a black rockfish found in northeastern Fukushima Prefecture in Japan, a local fishing association announced on Monday, February 22, 2021. Roughly 500 becquerels per kilogram of cesium was...
February 23, 2021
Heavy rainfall since mid-February has triggered widespread, severe flooding in Madre de Dios, Peru, leaving at least 15 000 people affected and thousands of property damage. This has prompted the government to declare a state of emergency for the region for 60 days....