(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20230407/0428Z (3) Volcano:Bezymianny (CAVW #300250) (4) Current aviation colour code:RED (5) Previous aviation colour code:orange (6) Source:KVERT (7) Notice Number:2023-48 (8) Volcano Location:N 55 deg 58 min E 160 deg 35 min (9) Area:Kamchatka, Russia (10) Summit Elevation:2882 m (9452.96 ft)(11) Volcanic Activity Summary:Volcanic ash emission gradually increased. Probably, a new block of lava is squeezed out on the lava dome, it's accompanied by ash explosions and hot avalanches. Satellite data by KVERT showed an ash plume extended about 230 km to the east-south-east from the volcano.\n\nAn eruption of the volcano continues. Ash explosions up to 10-15 km (32,800-49,200 ft) a.s.l. could occur during next several days. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:5000-5500 m (16400-18040 ft) AMSL Time and method of ash plume/cloud height determination: 20230407/0400Z – Video data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 230 km (143 mi)\nDirection of drift of ash plume/cloud of the volcano: ESE / azimuth 103 deg \nTime and method of ash plume/cloud determination: 20230407/0320Z – Himawari-9 14m15(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.