**Aviation Red Alert**Large explosion, ash to 37,000 ft (11 km) altitude at Shiveluch volcano in Kamchatka, Russia

The volcano is in an intense phase of activity, characterized by strong explosions and partial collapses of the growing lava dome accompanied by tall ash plumes and pyroclastic flows. 
 
An explosion this morning produced an ash plume that rose to flight level 370, i.e. 37,000 ft (11 km) altitude, Tokyo VAAC reported. 
 
Aviation color code is red. Aircraft on the N-America – Japan routes are advised to avoid the area. 
 
On 28 Feb, a series of explosions and collapses produced tall plumes >10 km altitude and large pyroclastic flows up to approx. 4 km distance (image).
Courtesy of Volcano Discovery

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