Jul 3, 2019
Raikoke’s First Eruption in 95 Years Captured by NASA Astronauts
Unlike some of its perpetually active neighbors on the Kamchatka Peninsula, Raikoke Volcano on the Kuril Islands rarely erupts. The small, oval-shaped island most recently exploded in 1924 and in 1778.
The dormant period ended around 4:00 a.m. local time on June 22, 2019, when a vast plume of ash and volcanic gases shot up from its 700-meter-wide crater. The dramatic event was captured from space by astronauts aboard the International Space Station.
In the image above we see the volcanic plume rising in a narrow column and then spreading out in a part of the plume known as the ‘umbrella region’. That is the area where the density of the plume and the surrounding air equalize and the plume stops rising. [source]