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
 

25th of March 2021, 2 weeks ago

2021-03-25 00:49:00 UTC Orange

Raung - 20210325/0049Z 

Burhan Alethea, A.Md., Raung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0030 UTC (0730 local). Best estimate of ash-cloud top is around 14502 FT (4532 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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10th of March 2021, 1 month ago

2021-03-10 12:22:00 UTC Orange

Raung - 20210310/1222Z 

Mukijo, Raung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1220 UTC (1920 local). Best estimate of ash-cloud top is around 12262 FT (3832 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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8th of March 2021, 1 month ago

2021-03-08 12:41:00 UTC Orange

Raung - 20210308/1241Z 

Burhan Alethea, A.Md., Raung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1242 UTC (1942 local). Best estimate of ash-cloud top is around 13222 FT (4132 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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7th of March 2021, 1 month ago

2021-03-07 15:16:00 UTC Orange

Raung - 20210307/1516Z 

Burhan Alethea, A.Md., Raung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1521 UTC (2221 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 13862 FT (4332 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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6th of March 2021, 1 month ago

2021-03-06 22:37:00 UTC Orange

Raung - 20210306/2237Z 

Mukijo, Raung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2235 UTC (0535 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 12262 FT (3832 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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2021-03-06 01:21:00 UTC Orange

Raung - 20210306/0121Z 

Mukijo, Raung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0105 UTC (0805 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 13862 FT (4332 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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5th of March 2021, 1 month ago

2021-03-05 08:05:00 UTC Orange

Raung - 20210305/0805Z 

Mukijo, Raung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0801 UTC (1501 local). Best estimate of ash-cloud top is around 13862 FT (4332 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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4th of March 2021, 1 month ago

2021-03-04 16:44:00 UTC Orange

Raung - 20210304/1644Z 

Burhan Alethea, A.Md., Raung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1532 UTC (2232 local). Best estimate of ash-cloud top is around 13862 FT (4332 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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3rd of March 2021, 1 month ago

2021-03-03 10:11:00 UTC Orange

Raung - 20210303/1011Z 

Mukijo, Raung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1015 UTC (1715 local). Eruption and ash emission is continuing Best estimate of ash-cloud top is around 14502 FT (4532 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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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.