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 October 2021, 2 days ago

2021-10-25 22:43:00 UTC Orange

Ili Lewotolok - 20211025/2243Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 20 hours ago

Eruption with volcanic ash cloud at 2148 UTC (0548 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 11347 FT (3546 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 October 2021, 1 week ago

2021-10-14 22:19:00 UTC Orange

Ili Lewotolok - 20211014/2219Z 

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

Eruption with volcanic ash cloud at 2217 UTC (0617 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 Northwest.

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2021-10-14 22:06:00 UTC Orange

Ili Lewotolok - 20211014/2206Z 

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

Eruption with volcanic ash cloud at 2203 UTC (0603 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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2021-10-14 15:20:00 UTC Orange

Ili Lewotolok - 20211014/1520Z 

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

Eruption with volcanic ash cloud at 1507 UTC (2307 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 Northwest.

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2021-10-14 09:12:00 UTC Orange

Ili Lewotolok - 20211014/0912Z 

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

Eruption with volcanic ash cloud at 0911 UTC (1711 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 west.

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2021-10-14 08:54:00 UTC Orange

Ili Lewotolok - 20211014/0854Z 

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

Eruption with volcanic ash cloud at 0856 UTC (1656 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6954 FT (2173 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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7th of October 2021, 2 weeks ago

2021-10-07 09:23:00 UTC Orange

Ili Lewotolok - 20211007/0923Z 

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

Eruption with volcanic ash cloud at 0928 UTC (1728 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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2021-10-07 09:08:00 UTC Orange

Ili Lewotolok - 20211007/0908Z 

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

Eruption with volcanic ash cloud at 0913 UTC (1713 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6314 FT (1973 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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2021-10-07 08:57:00 UTC Orange

Ili Lewotolok - 20211007/0857Z 

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

Eruption with volcanic ash cloud at 0903 UTC (1703 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 10707 FT (3346 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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6th of October 2021, 3 weeks ago

2021-10-06 09:30:00 UTC Orange

Ili Lewotolok - 20211006/0930Z 

Nandra Widyawanto, A.Md., Ili Lewotolok Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0920 UTC (1720 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 Northwest..

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5th of October 2021, 3 weeks ago

2021-10-05 23:42:00 UTC Orange

Ili Lewotolok - 20211005/2342Z 

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

Eruption with volcanic ash cloud at 2347 UTC (0747 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 10707 FT (3346 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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2021-10-05 00:18:00 UTC Orange

Ili Lewotolok - 20211005/0018Z 

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

Eruption with volcanic ash cloud at 0001 UTC (0801 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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1st of October 2021, 3 weeks ago

2021-10-01 01:37:00 UTC Orange

Ili Lewotolok - 20211001/0137Z 

Fadlan Djamil, A.Md., Ili Lewotolok Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0118UTC (0918 local). Eruption and ash emission is 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 west.

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26th of August 2021, 2 months ago

2021-08-26 02:42:00 UTC Orange

Ili Lewotolok - 20210826/0242Z 

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

Eruption with volcanic ash cloud at 0239 UTC (1039 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 West.

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25th of August 2021, 2 months ago

2021-08-25 06:46:00 UTC Orange

Ili Lewotolok - 20210825/0646Z 

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

Eruption with volcanic ash cloud at 0622 UTC (1422 local). Eruption and ash emission is not 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 west.

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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.