(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20210909/2238Z (3) Volcano:Chirinkotan (CAVW #290260) (4) Current aviation colour code:YELLOW (5) Previous aviation colour code:orange (6) Source:KVERT (7) Notice Number:2021-109 (8) Volcano Location:N 48 deg 58 min E 153 deg 28 min (9) Area:Northern Kuriles, Russia (10) Summit Elevation:724 m (2374.72 ft)(11) Volcanic Activity Summary:The activity of Chirinkotan volcano decreased: an ash plume for 126 km of distance was noted on 23 August, 2021, last time. But activity of the volcano, possibly, will continue. KVERT continues to monitor Chirinkotan volcano.\n\nA moderate activity of the volcano probably continues. Ash explosions up to 8-10 km (26,200-32,800 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:NO ASH CLOUD PRODUSED(13) Other volcanic cloud information:NO ASH CLOUD PRODUSED(14) Remarks:(15) Contacts:Dr. Olga A. Girina, Head of KVERT, IVS FEB RAS\ngirina@kscnet.ru +74152202044\n\nDuty scientist: +79622825253 (16) Next Notice:A new VONA will be issued if conditions change significantly or the colour code is changed. VONAs are posted at http://www.kscnet.ru/ivs/kvert/.\n\nIn Russia, KVERT, on behalf of the Institute of Volcanology and Seismology (IVS) FEB RAS, is responsible for providing information on volcanic activity to international air navigation services for the airspace users.