(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20180912/2315Z (3) Volcano:Sarychev Peak (CAVW #290240) (4) Current aviation colour code:YELLOW (5) Previous aviation colour code:green (6) Source:KVERT (7) Notice Number:2018-83 (8) Volcano Location:N 48 deg 5 min E 153 deg 12 min (9) Area:Central Kuriles, Russia (10) Summit Elevation:4906.88 ft (1496 m)(11) Volcanic Activity Summary:Activity of the volcano Sarychev Peak increased. According to visual data from Matua Island, explosions sent ash up to 3-4 km a.s.l. at 19:03 UTC on 12 September. An ash cloud drifted to the south-east from the volcano. At 21:00 UTC an ash cloud 5.5x6 km in size moved for about 121 km to the south-east from the volcano. Later the ash cloud was not observed.\n\nActivity of the volcano increased. Strong ash explosions could occur at any time. (12) Volcanic cloud height:9840-13120 ft (3000-4000 m) AMSL Time and method of ash plume/cloud height determination: 20180912/1903Z – Visual data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 75 mi (121 km)\nDirection of drift of ash plume/cloud of the volcano: SE / azimuth 127 deg \nTime and method of ash plume/cloud determination: 20180912/2100Z – Himawari-8(14) Remarks:A thermal anomaly over the volcano is noting sometimes from 07 May, 2018. Last moderate ash explosion of the volcano Sarychev Peak occurred on 11 August 2018.(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/index_eng.php.\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.