VOLKAM17 EXERCISE EXERCISE EXERCISE VOLKAM17 EXERCISE EXERCISE EXERCISE VOLKAM17 EXERCISE EXERCISE EXERCISE

 (1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
 (2) Issued:20170420/2200Z
 (3) Volcano:Koshelev (CAVW #300020)
 (4) Current Aviation Color Code:RED
 (5) Previous Aviation Color Code:green
 (6) Source:KVERT
 (7) Notice Number:2017-0000
 (8) Volcano Location:N 51 deg 21 min E 156 deg 45 min
 (9) Area:Kamchatka, Russia
(10) Summit Elevation:5943.36 ft (1812 m)
(11) Volcanic Activity Summary:Very strong explosive eruption of Koshelev volcano began at 21:45 UTC on April 20, 2017. According to satellite data, ash is reaching 45,000 ft (13.8 km) a.s.l. and ash plume is drifting to the southeast of the volcano on the height 45,000 ft (13.8 km) a.s.l. at this time. Ash emission is continuing.

A strong explosive eruption of the volcano continues. Ongoing activity could affect international and low-flying aircraft.
(12) Volcanic cloud height:45264 ft (13800 m) AMSL Time and method of ash plume/cloud height determination: 20170420/2145Z – NOAA 18 (4m5)
(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 19 mi (30 km)
Direction of drift of ash plume/cloud of the volcano: ESE / azimuth 120 deg
Time and method of ash plume/cloud determination: 20170420/2145Z – NOAA 18 (4m5)
(14) Remarks:This strong explosive eruption is extremely hazardous for aircraft downwind. There was one known a strong explosive eruption of Koshelev volcano which occurred probably in the end of 17 Century. Koshelev volcano is not monitored with a seismic station. KVERT uses satellite data and sometimes visual observations from Severo-Kurilsk (Paramushir Island) and pilots reports to monitor Koshelev volcano.
(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) FEB 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 20, 2017. KVERT, Institute of Volcanology and Seismology FEB RAS. URL: http://www.kscnet.ru/ivs/kvert/van/?n=2017-0000.
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]