Great Sitkin volcano (Aleutian Islands, Alaska): eruption continues with new lava flow
Mon, 13 Sep 2021, 02:1202:12 AM | BY: MARTIN
The effusive eruption of the volcano is in progress as the active extrusive lava dome continues to grow in the inner summit crater since mid-July.
The growing lava dome visible in the infrared (SWIR) multispectral satellite image from 18 August (image: (H. Dietterich/USGS/AVO)
A satellite image from 9 September confirms that a new lava flow started to emerge from the summit crater on the southern flank.
The actively lava dome has now mostly covered the previous summit lava dome from the 1974 eruption. The lava dome has currently dimensions of about 1,100 m (3,600 ft) east-west and about 860 m (2,820 ft) north-south, and is 25–30 m (82–98 ft) thick.
A swarm of small earthquakes continues to be observed beneath the volcanic edifice.
According to TROPOMI satellite instrument a few hundred tonnes/day of sulfur dioxide (SO2) emissions were detected in satellite images.
No ash or explosive activity has been detected during this effusive phase since a small ash deposit was observed on July 26.
As lava flows down steep slopes, it is possible that portions of the lava flow front could collapse, generating block-and-ash flows and related small phoenix clouds.
Source: Alaska Volcano Observatory volcano activity update 12 September 2021
Sat, 4 Sep 2021, 06:29
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