Aviation color codes
Volcanic danger prognosis for aviation (in Russian)
Current activity of the volcanoes (photos)
KVERT/Volcano Observatory Notification to Aviation (VONA)

Archives in the old format
VONA/KVERT Information Releases (01.2005-05.2012)

 (2) Issued:20151122/0457Z
 (3) Volcano:Sheveluch (CAVW #300270)
 (4) Current Aviation Color Code:ORANGE
 (5) Previous Aviation Color Code:orange
 (6) Source:KVERT
 (7) Notice Number:2015-208
 (8) Volcano Location:N 56 deg 38 min E 161 deg 18 min
 (9) Area:Kamchatka, Russia
(10) Summit Elevation:10768.24 ft (3283 m), the dome elevation ~8200 ft (2500 m)
(11) Volcanic Activity Summary:Explosions sent ash up to 5,5 km a.s.l. and an ash plume extended to the west of the volcano.

Explosive-extrusive eruption of the volcano continues. Ash explosions up to 32,800 ft (10 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
(12) Volcanic cloud height:16400 ft (5000 m) a.s.l. Time and method of ash plume/cloud height determination: 20151122/0350Z – Video data
(13) Other volcanic cloud information:
Start time of explosion and how determined: 20151122/0210Z – Video data
(14) Remarks:
(15) Contacts: Anton A. Nuzhdaev, IVS FEB RAS

Duty scientist: +79622825253
(16) Next Notice:A new VONA will be issued if conditions change significantly or the Aviation Color Code is changes. VONAs are posted at

In Russia, KVERT, on behalf of the Institute of Volcanology and Seismology (IVS) FED RAS, is responsible for providing information on volcanic activity to international air navigation services for the airspace users.


For formal scientific citation of this VONA/KVERT Information Release, please use the following:
VONA/KVERT Information Release, November 22, 2015. KVERT, Institute of Volcanology and Seismology FEB RAS. URL:

Aviation Color Codes

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.

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.

Volcano is exhibiting heightened unrest with increased likelihood of eruption.


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

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


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

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