VONA
What is VONA?

VONA stands for Volcano Observatory Notice for Aviation. It issues reports for changes, both increases and decreases, in volcanic activities, providing a description on the nature of the unrest or eruption, potential or current hazards as well as likely outcomes. See the following link (USGS) for further details. The Center for Volcanology and Geological Hazard Mitigation (CVGHM) under the Geological Agency of the Indonesian Ministry of Energy and Mineral Resources produced VONA's reports based on analysis of data from the agency's monitoring networks as well as from direct observations. VONA's alert levels are color-coded to indicate the different types of notifications addressing specific informative needs. The reports are disseminated via email to national and international stakeholders in the aviation sector. Other interested parties can avail of them through email subscription. All notifications are publicly available online.

USGS
 

24th of December 2017, 3 years ago

2017-12-24 02:35:00 UTC Orange

Agung - 20171224/0235Z 

Anwar Sidiq, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 0205 UTC ( 1005 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 59578 FT (18054 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northeast.

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23rd of December 2017, 3 years ago

2017-12-23 04:15:00 UTC Orange

Agung - 20171223/0415Z 

Wahyu Ardi Setiawan, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 0357 UTC ( 1157 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 59578 FT (18054 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northeast.

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12th of December 2017, 3 years ago

2017-12-12 11:11:00 UTC Orange

Agung - 20171212/1111Z 

Wahyu Ardi Setiawan, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 0955 UTC ( 1755 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 59578 FT (18054 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west. .

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8th of December 2017, 3 years ago

2017-12-08 00:30:00 UTC Orange

Agung - 20171208/0030Z 

Wahyu Ardi Setiawan, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 2359 UTC (0759 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 55354 FT (16774 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..

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28th of November 2017, 3 years ago

2017-11-28 23:49:00 UTC Orange

Agung - 20171128/2349Z 

Nurul Husaeni, A.Md., Agung Volcano Observatory - 3 years ago

Ash cloud is observed at 2245 UTC (0645 local). Ash emission is continuing. Best estimate of ash-cloud top is around 54298 FT (16454 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southeast..

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27th of November 2017, 3 years ago

2017-11-27 23:16:00 UTC Red

Agung - 20171127/2316Z 

Martanto, S.T., Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 2310 UTC (0710 LT). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 75418 FT (22854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west - southwest. .

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25th of November 2017, 3 years ago

2017-11-25 21:50:00 UTC Red

Agung - 20171125/2150Z 

Martanto, S.T., Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 2145 UTC (0545 LT). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 64858 FT (19654 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash coud moving to east-southeast .

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2017-11-25 21:09:00 UTC Orange

Agung - 20171125/2109Z 

Martanto, S.T., Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 2105 UTC (0505 LT). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 54298 FT (16454 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash coud moving to east-southeast .

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2017-11-25 10:08:00 UTC Orange

Agung - 20171125/1008Z 

Aditya Sebastian Andreas, S.Si., M.Si., Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 0920 UTC (1720 LT). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 49018 FT (14854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash coud moving to west-southwest.

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21st of November 2017, 3 years ago

2017-11-21 09:39:00 UTC Orange

Agung - 20171121/0939Z 

Aditya Sebastian Andreas, S.Si., M.Si., Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud started at 0905 UTC (1705 LT). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 40570 FT (12294 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east - south east..

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11th of November 2017, 3 years ago

2017-11-11 23:22:00 UTC Yellow

Agung - 20171111/2322Z 

Oktory Prambada, S.T., M.Sc, Agung Volcano Observatory - 3 years ago

Medium pressure white plume, likely dominated by water vapor, is observed at 2150 UTC (0550 Central Indonesia Time) with a height of 500 m above the summit or around 3642 m above sea level. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The white plume is moving vertical slowly..

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2017-11-11 22:46:00 UTC Yellow

Agung - 20171111/2246Z 

Oktory Prambada, S.T., M.Sc, Agung Volcano Observatory - 3 years ago

Medium pressure white plume, likely dominated by water vapor, is observed at 2150 UTC (0550 Central Indonesia Time) with a height of 500 m above the summit or around 3642 m above sea level. Best estimate of ash-cloud top is around 71640 FT (21709 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The white plume is moving vertical slowly..

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29th of October 2017, 3 years ago

2017-10-29 10:43:00 UTC Yellow

Agung - 20171029/1043Z 

Aditya Sebastian Andreas, S.Si., M.Si., Agung Volcano Observatory - 3 years ago

Low pressure white plume likely dominated by water vapor with maximum height 250 m above the summit or 3392 m above sea level. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The white plume moved to west.

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7th of October 2017, 3 years ago

2017-10-07 14:30:00 UTC Orange

Agung - 20171007/1430Z 

Syarif Abdul Manaf, A.Md., Agung Volcano Observatory - 3 years ago

Medium pressure white plume, likely dominated by water vapor, is observed at 1245 UTC (2045 Central Indonesia Time) with a height of 1500 m above the summit or around 4642 m above sea level. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The white plume is moving east slowly..

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29th of September 2017, 3 years ago

2017-09-29 00:46:00 UTC Orange

Agung - 20170929/0046Z 

Oktory Prambada, S.T., M.Sc, Agung Volcano Observatory - 3 years ago

Low pressure white plume, likely dominated by water vapor, is observed emitting continuously from the main crater at 0045 UTC (0745 Central Indonesia Time) Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Plume is observed emitting continuously from the main crater and reached an altitude of approximately 100 m and moving to West .

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VONA Color Code

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 with column height below 6000 meter above sea level.


Eruption is forecast to be imminent with significant emission of ash with column height above 6000 meter above sea level.