(1) KVERT VOLCANIC ACTIVITY NOTICE (VAN)
 (2) Issued:20260818/2157Z
 (3) Volcano:Klyuchevskoy (CAVW #300260)
 (4) Current aviation colour code:ORANGE
 (5) Previous aviation colour code:orange
 (6) Source:KVERT
 (7) Notice Number:2026-90
 (8) Volcano Location:N 56 deg 03 min E 160 deg 39 min
 (9) Area:Kamchatka, Russia
(10) Summit Elevation:4750 m (15580 ft)
(11) Volcanic Activity Summary:The moderate explosive eruption of the volcano continues. According to video data, a gas-steam plume with some amount of ash rose up to 5.5 km a.s.l. Satellite data by KVERT showed a thermal anomaly on the volcano; an ash plume is extending for 290 km to the east-southeast of the volcano.

The moderate explosive eruption of the volcano continues. Ongoing activity could affect low-flying aircraft.
(12) Volcanic cloud height:5500 m (18040 ft) AMSL Time and method of ash plume/cloud height determination: 20260818/2040Z – Video data
(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 290 km (180 mi)
Direction of drift of ash plume/cloud of the volcano: E / azimuth 101 deg
Time and method of ash plume/cloud determination: 20260818/2120Z – Himawari-9 14m15
(14) Remarks:
(15) Contacts:Dr. Olga A. Girina, Head of KVERT, IVS FEB RAS, girina@kscnet.ru, +74152202044

Duty scientist: +79622825253
(16) Next Notice:A new Notice will be issued if conditions change significantly or the colour code is changed. Notices 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 KVERT Volcanic Activity Notice, please use the following:
KVERT Volcanic Activity Notice, August 18, 2026. KVERT, Institute of Volcanology and Seismology FEB RAS. URL: http://kvert.febras.net/van/?n=2026-90.
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]

UNASSIGNED

There is insufficient information available to assess the current status of the volcano or volcanic activity.