Active lava dome of Great Sitkin volcano on 4 Aug 2021 (image: Dave Ward via AVO / facebook)
The Alaska Volcano Observatory published a great photo of the active lava dome of the volcano taken a few days ago (see original post on facebook).
It shows the dark mass of fresh viscous lava that has been accumulating on the summit crater since mid July this year, following the re-awakening of the volcano in mid May, when a series of explosions cleared the vent to make way for new magma to reach the surface.
The last explosive event was 25 May 25. Since the arrival of the dome, AVO has been monitoring and using satellite images to measure its rate of growth: It is now over 100m in diameter. At night, Adak residents about 26 miles across the water reported seeing incandescence illuminating the steam plume rising from the dome.