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
 

16th of July 2016, 5 years ago

2016-07-16 01:57:00 UTC Orange

Dukono - 20160716/0157Z 

Martanto, S.T., Dukono Volcano Observatory - 5 years ago

Eruption with volcanic ash cloud observed at 1959 UTC (0459 Local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 23539 FT (7133 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Dark grey ash cloud moving west-north west.

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2nd of May 2016, 5 years ago

2016-05-02 03:25:00 UTC Orange

Dukono - 20160502/0325Z 

Martanto, S.T., Dukono Volcano Observatory - 5 years ago

Eruption with grey-colored ash is observed. The eruption and ash emission is continuing. Best estimate of ash-cloud top is around 19925 FT (6038 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The volcanic ash is moving towards west direction..

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24th of April 2016, 5 years ago

2016-04-24 22:58:00 UTC Orange

Dukono - 20160424/2258Z 

Martanto, S.T., Dukono Volcano Observatory - 5 years ago

Eruption with white-grey colored volcanic ash-cloud is observed on 24 April 2016 at 22:45 UTC (25 April 2016 at 07:45 UTC). Eruption is continuing. Best estimate of ash-cloud top is around 20981 FT (6358 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving to Southeast..

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23rd of April 2016, 5 years ago

2016-04-23 13:01:00 UTC Orange

Dukono - 20160423/1301Z 

Martanto, S.T., Dukono Volcano Observatory - 5 years ago

Eruption with white-grey colored ash is clearly observed at 12:32 UTC. Eruption is still ongoing. Best estimate of ash-cloud top is around 21509 FT (6518 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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14th of April 2016, 5 years ago

2016-04-14 22:50:00 UTC Orange

Dukono - 20160414/2250Z 

Martanto, S.T., Dukono Volcano Observatory - 5 years ago

Continuous eruption with volcanic ash cloud is observed on 14 April 2016 at 21:57 UTC (15 April 2016 06:57 localtime/UTC +9). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 18341 FT (5558 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey coloured ash-cloud is moving to the west-southwest..

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10th of April 2016, 5 years ago

2016-04-10 06:40:00 UTC Orange

Dukono - 20160410/0640Z 

Martanto, S.T., Dukono Volcano Observatory - 5 years ago

Continuous eruption with white-grey coloured volcanic ash cloud is observed on 10 April 2016 at 05:58 UTC (14:58 local/UTC 9). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 22037 FT (6678 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving to the northeast..

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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.