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 April 2021, 1 week ago

2021-04-24 23:14:00 UTC Orange

Semeru - 20210424/2314Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 2322 UTC (0622 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 13363 FT (4176 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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2021-04-24 18:35:00 UTC Orange

Ili Lewotolok - 20210424/1835Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 0624 UTC (0224 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6474 FT (2023 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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2021-04-24 00:15:00 UTC Orange

Sinabung - 20210424/0015Z 

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

Eruption with volcanic ash cloud at 0015 UTC (0715 local) Best estimate of ash-cloud top is around 14272 FT (4460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E-SE..

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23rd of April 2021, 1 week ago

2021-04-23 22:32:00 UTC Orange

Semeru - 20210423/2232Z 

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

Eruption with volcanic ash cloud at 2239 UTC (0539 local) Best estimate of ash-cloud top is around 13363 FT (4176 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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22nd of April 2021, 2 weeks ago

2021-04-22 05:14:00 UTC Orange

Ibu - 20210422/0514Z 

Novia Antika Anggraeni, S.Si., Ibu Volcano Observatory - 2 weeks ago

Eruption with volcanic ash-cloud at 0358 UTC (1258 local) Best estimate of ash-cloud top is around 7440 FT (2325 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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21st of April 2021, 2 weeks ago

2021-04-21 23:44:00 UTC Orange

Semeru - 20210421/2344Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 2348 UTC (0648 local). Best estimate of ash-cloud top is around 13363 FT (4176 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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2021-04-21 00:58:00 UTC Orange

Semeru - 20210421/0058Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0103 UTC (0803 local). Best estimate of ash-cloud top is around 14003 FT (4376 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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20th of April 2021, 2 weeks ago

2021-04-20 22:48:00 UTC Orange

Semeru - 20210420/2248Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 2257 UTC (0557 local). Best estimate of ash-cloud top is around 13363 FT (4176 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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2021-04-20 21:55:00 UTC Orange

Ili Lewotolok - 20210420/2155Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 2137 UTC (0537 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 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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2021-04-20 09:26:00 UTC Orange

Ibu - 20210420/0926Z 

Novia Antika Anggraeni, S.Si., Ibu Volcano Observatory - 2 weeks ago

Eruption with volcanic ash-cloud at 0919 UTC (1819 local) Best estimate of ash-cloud top is around 6800 FT (2125 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to east.

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2021-04-20 00:00:00 UTC Orange

Sinabung - 20210420/0000Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0055 UTC (0655 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E.

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19th of April 2021, 2 weeks ago

2021-04-19 22:09:00 UTC Orange

Semeru - 20210419/2209Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 2218 UTC (0518local) 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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2021-04-19 03:46:00 UTC Orange

Sinabung - 20210419/0346Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0347 UTC (1047 local) Best estimate of ash-cloud top is around 11072 FT (3460 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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2021-04-19 03:41:00 UTC Orange

Sinabung - 20210419/0341Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0343 UTC (1043 local) Best estimate of ash-cloud top is around 14272 FT (4460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to SE..

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2021-04-19 01:44:00 UTC Orange

Sinabung - 20210419/0144Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0145 UTC (0845 local) 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 moving to WN..

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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.