(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
 (2) Issued:20251027/0205Z
 (3) Volcano:Krasheninnikov (CAVW #300190)
 (4) Current aviation colour code:ORANGE
 (5) Previous aviation colour code:orange
 (6) Source:KVERT
 (7) Notice Number:2025-126
 (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:Moderate emissions of ash from the volcano continues. The explosions sent ash up to 3.5 km a.s.l., and an ash plume is extending for 77 km to the east-southeast of the volcano.

The explosive-effusive eruption of the volcano continues. The danger of ash explosions up to 6 km (19,700 ft) a.s.l. remains. Ongoing activity could affect low-flying aircraft.
(12) Volcanic cloud height:3400-3500 m (11152-11480 ft) AMSL Time and method of ash plume/cloud height determination: 20251027/0059Z – Suomi NPP 15m16
(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 77 km (48 mi)
Direction of drift of ash plume/cloud of the volcano: ESE / azimuth 116 deg
Time and method of ash plume/cloud determination: 20251027/0059Z – Suomi NPP 15m16
(14) Remarks:
 The first historical eruption of the volcano began on 02 August, 2025. The explosive-effusive eruption of the volcano continues. The previous effusive eruption of the volcano occurred 400-600 years ago.
(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, октября 27, 2025. KVERT, Institute of Volcanology and Seismology FEB RAS. URL: http://kvert.febras.net/van/?n=2025-126.
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]