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
 

21st of January 2021, 1 month ago

2021-01-21 22:23:00 UTC Orange

Semeru - 20210121/2223Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2256 UTC (0526 local) Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to North.

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2021-01-21 13:45:00 UTC Orange

Raung - 20210121/1345Z 

Rudra Wibowo, A.Md., Raung Volcano Observatory - 1 month ago

On 21 Januari 2021, Eruption with volcanic ash 13:29 UTC ( 20:29 Local Time ) Best estimate of ash-cloud top is around 11942 FT (3732 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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2021-01-21 00:56:00 UTC Orange

Raung - 20210121/0056Z 

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

Eruption with volcanic ash cloud at 0038 UTC (0738 local) Best estimate of ash-cloud top is around 11942 FT (3732 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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20th of January 2021, 1 month ago

2021-01-20 23:42:00 UTC Orange

Sinabung - 20210120/2342Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Eruption with ash clouds at 23:35 UTC (06:35 local time). The eruption lasted for 94 seconds Best estimate of ash-cloud top is around 9472 FT (2960 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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2021-01-20 23:29:00 UTC Orange

Raung - 20210120/2329Z 

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

Eruption with volcanic ash cloud at 2218 UTC (0518 local) Best estimate of ash-cloud top is around 11942 FT (3732 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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2021-01-20 23:14:00 UTC Orange

Semeru - 20210120/2314Z 

Liswanto, A.P., Semeru Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2150 UTC (0450 local) Best estimate of ash-cloud top is around 13043 FT (4076 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. ash-cloud moving to north.

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16th of January 2021, 1 month ago

2021-01-16 10:51:00 UTC Orange

Semeru - 20210116/1051Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1024 UTC (1724 local) Best estimate of ash-cloud top is around 18163 FT (5676 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 January 2021, 1 month ago

2021-01-12 00:19:00 UTC Orange

Dukono - 20210112/0019Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2331 UTC (0831 local). Best estimate of ash-cloud top is around 6173 FT (1929 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..

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10th of January 2021, 1 month ago

2021-01-10 23:23:00 UTC Orange

Dukono - 20210110/2323Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2214 UTC (0714 local). Best estimate of ash-cloud top is around 6173 FT (1929 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest..

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9th of January 2021, 1 month ago

2021-01-09 02:29:00 UTC Orange

Merapi - 20210109/0229Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 1 month ago

Pyroclastic density current with ash cloud at 0145 UTC (0845 local). Eruption has stopped. Best estimate of ash-cloud top is around 10138 FT (3168 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Pyroclastic density current heading northwest..

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7th of January 2021, 1 month ago

2021-01-07 14:15:00 UTC Orange

Sinabung - 20210107/1415Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1418 UTC (2118 local). Ash-cloud not visible. Ash-cloud is not visible .

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2021-01-07 13:28:00 UTC Orange

Sinabung - 20210107/1328Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1329 UTC (2029 local) Ash-cloud not visible. Ash-cloud is not visible .

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2021-01-07 02:57:00 UTC Orange

Merapi - 20210107/0257Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 1 month ago

Eruption with pyroclastic density current at 0102 UTC (0802 local). Eruption has stopped. Best estimate of ash-cloud top is around 10138 FT (3168 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Pyroclastic density current heading southwest..

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2021-01-07 01:55:00 UTC Orange

Ibu - 20210107/0155Z 

Novia Antika Anggraeni, S.Si., Ibu Volcano Observatory - 1 month ago

Eruption with volcanic ash-cloud at 0158 UTC (1058 local) Best estimate of ash-cloud top is around 5840 FT (1825 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to north.

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6th of January 2021, 1 month ago

2021-01-06 00:29:00 UTC Orange

Dukono - 20210106/0029Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2326 UTC (0826 local). Best estimate of ash-cloud top is around 5853 FT (1829 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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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.