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
 

6th of April 2017, 5 years ago

2017-04-06 01:10:00 UTC Orange

Sinabung - 20170406/0110Z 

Deri Al Hidayat, A.Md., Sinabung Volcano Observatory - 5 years ago

Hot could avalanches with ash clouds at 01:01 UTC (08:01 local time). The eruption lasted for 177 seconds. Best estimate of ash-cloud top is around 31258 FT (9472 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to east .

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5th of April 2017, 5 years ago

2017-04-05 22:29:00 UTC Orange

Dukono - 20170405/2229Z 

Nia Haerani, Dr. S.T., M.T., Dukono Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud at 2223 UTC (0723 local). Best estimate of ash-cloud top is around 15091 FT (4573 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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2017-04-05 04:16:00 UTC Orange

Sinabung - 20170405/0416Z 

Ardi, Sinabung Volcano Observatory - 5 years ago

Hot could avalanches with ash clouds at 04:07 UTC (11:07 local time). The eruption lasted for 418 seconds Best estimate of ash-cloud top is around 31258 FT (9472 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to east - Southeast .

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4th of April 2017, 5 years ago

2017-04-04 22:51:00 UTC Orange

Dukono - 20170404/2251Z 

Nia Haerani, Dr. S.T., M.T., Dukono Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud at 2245 UTC (0745 local). Best estimate of ash-cloud top is around 18259 FT (5533 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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2017-04-04 01:01:00 UTC Orange

Ibu - 20170404/0101Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud at 0013 UTC (0913 local). Best estimate of ash-cloud top is around 17160 FT (5200 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..

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2017-04-04 00:22:00 UTC Orange

Dukono - 20170404/0022Z 

Nia Haerani, Dr. S.T., M.T., Dukono Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud at 0005 UTC (0905 local). Best estimate of ash-cloud top is around 21427 FT (6493 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..

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3rd of April 2017, 5 years ago

2017-04-03 22:59:00 UTC Orange

Sinabung - 20170403/2259Z 

Ardi, Sinabung Volcano Observatory - 5 years ago

Eruption with ash clouds at 19:27 UTC (02:27 local time). The eruption lasted for 352 seconds Best estimate of ash-cloud top is around 52378 FT (15872 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to east-southeast.

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2017-04-03 22:55:00 UTC Orange

Sinabung - 20170403/2255Z 

Ardi, Sinabung Volcano Observatory - 5 years ago

Hot could avalanches with ash clouds at 17:55 UTC (00:55 local time). The event lasted for 324 seconds 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. Ash cloud is moving to east - Southeast .

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2017-04-03 22:24:00 UTC Orange

Dukono - 20170403/2224Z 

Nia Haerani, Dr. S.T., M.T., Dukono Volcano Observatory - 5 years ago

Eruption produced dark grey volcanic ash cloud at 2200 UTC (0700 local). Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north and northeast..

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2nd of April 2017, 5 years ago

2017-04-02 23:40:00 UTC Orange

Ibu - 20170402/2340Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 5 years ago

Eruption with ash cloud at 2257 UTC (0757 local). Ash emission is continuing. Best estimate of ash-cloud top is around 18216 FT (5520 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..

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2017-04-02 22:41:00 UTC Orange

Dukono - 20170402/2241Z 

Nia Haerani, Dr. S.T., M.T., Dukono Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud at 2228 UTC (0728 local). Best estimate of ash-cloud top is around 16147 FT (4893 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..

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1st of April 2017, 5 years ago

2017-04-01 22:07:00 UTC Orange

Dukono - 20170401/2207Z 

Nia Haerani, Dr. S.T., M.T., Dukono Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud at 2117 UTC (0617 local). Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..

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30th of March 2017, 5 years ago

2017-03-30 23:16:00 UTC Orange

Dukono - 20170330/2316Z 

Nia Haerani, Dr. S.T., M.T., Dukono Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud at 2242 UTC (0742 local). Best estimate of ash-cloud top is around 16147 FT (4893 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north - east..

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2017-03-30 08:01:00 UTC Orange

Dukono - 20170330/0801Z 

Nia Haerani, Dr. S.T., M.T., Dukono Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud at 0736 UTC (1636 local). Best estimate of ash-cloud top is around 22483 FT (6813 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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29th of March 2017, 5 years ago

2017-03-29 22:06:00 UTC Orange

Dukono - 20170329/2206Z 

Nia Haerani, Dr. S.T., M.T., Dukono Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud at 2132 UTC (0632 local). Best estimate of ash-cloud top is around 17203 FT (5213 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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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.