(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20221015/2119Z (3) Volcano:Chikurachki (CAVW #290360) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:green (6) Source:KVERT (7) Notice Number:2022-135 (8) Volcano Location:N 50 deg 19 min E 155 deg 27 min (9) Area:Northern Kuriles, Russia (10) Summit Elevation:1816 m (5956.48 ft)(11) Volcanic Activity Summary:An explosive eruption began ~15:10 UTC on October 15 - an ash plume up to 4.5 km a.s.l. was noted on satellite images. Satellite data by KVERT showed an ash plume extended about 240 km to the east-south-east of the volcano.\n\nAn activity of the volcano continues. Ash explosions up to 6 km (19,700 ft) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft. (12) Volcanic cloud height:4000-4500 m (13120-14760 ft) AMSL Time and method of ash plume/cloud height determination: 20221015/2030Z – Himawari-8 14m15(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 240 km (149 mi)\nDirection of drift of ash plume/cloud of the volcano: ESE / azimuth 106 deg \nTime and method of ash plume/cloud determination: 20221015/2030Z – Himawari-8 14m15\nStart time of explosion and how determined: 20221015/1510Z – Satellite data(14) Remarks:(15) Contacts: Alexander G. Manevich, IVS FEB RAS\nmag@kscnet.ru +74152202115\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.