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 (1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
 (2) Issued:20160421/2159Z
 (3) Volcano:Karpinsky (CAVW #290350)
 (4) Current Aviation Color Code:RED
 (5) Previous Aviation Color Code:green
 (6) Source:KVERT
 (7) Notice Number:2016-45
 (8) Volcano Location:N 50 deg 8 min E 155 deg 22 min
 (9) Area:Northern Kuriles, Russia
(10) Summit Elevation:4349.28 ft (1326 m)
(11) Volcanic Activity Summary:Very strong explosive eruption of Karpinsky volcano began at 21:45 UTC on April 21, 2016. According to satellite data, ash is reaching 40,000 ft (12 km) a.s.l. and two ash plumes are drifting to the southeast – east – northeast of the volcano on the height 40,000 ft (12 km) a.s.l. and to the northeast of the volcano on the height 20,000 ft (6 km) a.s.l. at this time. Ash emission is continuing.

Ongoing activity could affect international and low-flying aircraft.
(12) Volcanic cloud height:First ash plume
39360 ft (12000 m) AMSL Time and method of ash plume/cloud height determination: 20160421/2145Z – NOAA 18 (4m5)

Second ash plume
19680 ft (6000 m) a.s.l. Time and method of ash plume/cloud height determination: 20160421/2145Z – NOAA 18 (4m5)
(13) Other volcanic cloud information:First ash plume
Distance of ash plume/cloud of the volcano: 17 mi (27 km)
Direction of drift of ash plume/cloud of the volcano: ESE / azimuth 120 deg
Time and method of ash plume/cloud determination: 20160421/2145Z – NOAA 18 (4m5)

Second ash plume
Distance of ash plume/cloud of the volcano: 62 mi (100 km)
Direction of drift of ash plume/cloud of the volcano: NNE / azimuth 30 deg
Time and method of ash plume/cloud determination: 20160421/2145Z – NOAA 18 (4m5)
(14) Remarks:This strong explosive eruption is extremely hazardous for aircraft downwind. There was one known a moderate explosive eruption of Karpinsky volcano which occurred on 05 November 1952, and it was entails with a strong earthquake. Karpinsky volcano is not monitored with a seismic station. KVERT only uses satellite data to monitor Karpinsky volcano.
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(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 Aviation Color Code is changes. VONAs are posted at http://www.kscnet.ru/ivs/kvert/index_eng.php.

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.
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CITATION GUIDELINES

For formal scientific citation of this VONA/KVERT Information Release, please use the following:
VONA/KVERT Information Release, April 21, 2016. KVERT, Institute of Volcanology and Seismology FEB RAS. URL: http://www.kscnet.ru/ivs/kvert/van/?n=2016-45.
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]