(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
 (2) Issued:20250802/2157Z
 (3) Volcano:Krasheninnikov (CAVW #300190)
 (4) Current aviation colour code:ORANGE
 (5) Previous aviation colour code:green
 (6) Source:KVERT
 (7) Notice Number:2025-39
 (8) Volcano Location:N 54 deg 35 min E 160 deg 16 min
 (9) Area:Kamchatka, Russia
(10) Summit Elevation:1856 m (6087.68 ft)
(11) Volcanic Activity Summary:An explosive eruption of the Krasheninnikov volcano began at 16:50 UTC on 02 August, 2025б with ash explosions up to 3-4 km a.s.l. There is a first historic eruption of this volcano. According to data by Kronotsky nature park staff, at now explosions sent ash up to 5-6 km a.s.l., an ash deposits covered a part of Kronotsky nature park. Satellite data by KVERT showed an ash plume is moving for 75 km to the east of the volcano.

An explosive eruption of the volcano continues. Ongoing activity could affect low-flying aircraft.
(12) Volcanic cloud height:5000-6000 m (16400-19680 ft) AMSL Time and method of ash plume/cloud height determination: 20250802/2150Z – visual data
(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 72 km (45 mi)
Direction of drift of ash plume/cloud of the volcano: E / azimuth 82 deg
Time and method of ash plume/cloud determination: 20250802/2050Z – Himawari-9 14m15
Start time of explosion and how determined: /1650Z – Himawari-9 14m15
(14) Remarks:The volcano is associated with the Eastern volcanic belt and is located about 13 km south of Kronotsky lake, in 200 km from Petropavlovsk-Kamchatsky. The complex volcanic edifice consisting of two merged cones is in ancient caldera about 9 km in diameter. Northern cone has telescopic structure - in the center caldera about 2 km in diameter are located two cones enclosed each other. Height of least of them - 150 m, diameter of its crater - 60 m.
 The last lava effusion took place on 1463±40. No historic eruption is known. In 1963 traces of fumarolic activity were registered in the crater of the middle Northern cone.
(15) Contacts:Dr. Olga A. Girina, Head of KVERT, IVS FEB RAS
girina@kscnet.ru +74152202044

Duty 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://kvert.febras.net.

In 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.

CITATION GUIDELINES

For formal scientific citation of this VONA/KVERT Information Release, please use the following:
VONA/KVERT Information Release, August 02, 2025. KVERT, Institute of Volcanology and Seismology FEB RAS. URL: http://kvert.febras.net/van/?n=2025-39.
Aviation Colour Codes

GREEN

Volcano is in normal, non-eruptive state

   or, after a change from a higher level:

Volcanic activity considered to have ceased, and volcano reverted to its normal, non-eruptive state.

YELLOW

Volcano is experiencing signs of elevated unrest above known background levels.    

 or, after a change from higher level:

Volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.

ORANGE

Volcano is exhibiting heightened unrest with increased likelihood of eruption.

   or,

Volcanic eruption is underway with no or minor ash emission.
[specify ash-plume height if possible]

RED

Eruption is forecast to be imminent with significant emission of ash into the atmosphere likely.

  or,

Eruption is underway with significant emission of ash into the atmosphere.
[specify ash-plume height if possible]