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 May 2022, 5 days ago

2022-05-16 22:40:00 UTC Orange

Ili Lewotolok - 20220516/2240Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 4 days ago

There is no eruption activity but show an increasing in degassing with plumes height of 1000 meters above sea level. 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 west.

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14th of May 2022, 1 week ago

2022-05-14 00:49:00 UTC Orange

Ili Lewotolok - 20220514/0049Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 6 days ago

The eruption has not yet occurred but an increase in degassing has been observed ad ash emission is continuing. Best estimate of ash-cloud top is around 12307 FT (3846 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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5th of May 2022, 2 weeks ago

2022-05-05 22:26:00 UTC Orange

Ili Lewotolok - 20220505/2226Z 

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

Eruption with volcanic ash cloud at 2144 UTC (0544 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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2022-05-05 22:26:00 UTC Orange

Ili Lewotolok - 20220505/2226Z 

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

Eruption with volcanic ash cloud at 2144 UTC (0544 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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4th of May 2022, 2 weeks ago

2022-05-04 04:50:00 UTC Orange

Ili Lewotolok - 20220504/0450Z 

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

Eruption with volcanic ash cloud at 0445 UTC (1245 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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29th of April 2022, 3 weeks ago

2022-04-29 22:53:00 UTC Orange

Ili Lewotolok - 20220429/2253Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2128 UTC (0528 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6154 FT (1923 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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2022-04-29 10:16:00 UTC Orange

Ili Lewotolok - 20220429/1016Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0817 UTC (1617 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 Northwest.

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31st of March 2022, 1 month ago

2022-03-31 04:05:00 UTC Orange

Ili Lewotolok - 20220331/0405Z 

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

Eruption with volcanic ash cloud at 0404 UTC (1204 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.

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11th of March 2022, 2 months ago

2022-03-11 09:40:00 UTC Orange

Ili Lewotolok - 20220311/0940Z 

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

Eruption with volcanic ash cloud at 0926 UTC (1726 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 southwest.

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10th of March 2022, 2 months ago

2022-03-10 21:46:00 UTC Orange

Ili Lewotolok - 20220310/2146Z 

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

Eruption with volcanic ash cloud at 2147 UTC (0547 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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14th of February 2022, 3 months ago

2022-02-14 07:39:00 UTC Orange

Ili Lewotolok - 20220214/0739Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 0725 UTC (1525 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6794 FT (2123 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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12th of February 2022, 3 months ago

2022-02-12 08:19:00 UTC Orange

Ili Lewotolok - 20220212/0819Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 0804 UTC (1604 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 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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10th of February 2022, 3 months ago

2022-02-10 23:47:00 UTC Orange

Ili Lewotolok - 20220210/2347Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 2343 UTC (0743 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 8394 FT (2623 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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2022-02-10 23:40:00 UTC Orange

Ili Lewotolok - 20220210/2340Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 2329 UTC (0729 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 East.

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11th of January 2022, 4 months ago

2022-01-11 01:00:00 UTC Orange

Ili Lewotolok - 20220111/0100Z 

Nandra Widyawanto, A.Md., Ili Lewotolok Volcano Observatory - 4 months ago

Eruption with volcanic ash cloud at 0048 UTC (0848 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6794 FT (2123 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.