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
 

1st of December 2021, 1 day ago

2021-12-01 21:36:00 UTC Orange

Semeru - 20211201/2136Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 3 hours ago

Eruption with volcanic ash cloud at 2142 UTC (0442 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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2021-12-01 14:41:00 UTC Orange

Merapi - 20211201/1441Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 10 hours ago

Eruption with volcanic ash cloud at 1404 UTC (2104 local). Eruption has stopped. Best estimate of ash-cloud top is around 12698 FT (3968 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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28th of November 2021, 4 days ago

2021-11-28 22:04:00 UTC Orange

Semeru - 20211128/2204Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 3 days ago

Eruption with volcanic ash cloud at 2205 UTC (0505 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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2021-11-28 07:53:00 UTC Orange

Semeru - 20211128/0753Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 3 days ago

Eruption with volcanic ash cloud at 0800 UTC (1500 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 south.

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27th of November 2021, 5 days ago

2021-11-27 00:19:00 UTC Orange

Semeru - 20211127/0019Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 5 days ago

Eruption with volcanic ash cloud at 0024 UTC (0724 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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26th of November 2021, 6 days ago

2021-11-26 09:42:00 UTC Orange

Ili Lewotolok - 20211126/0942Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 5 days 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 southeast.

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25th of November 2021, 1 week ago

2021-11-25 22:48:00 UTC Orange

Semeru - 20211125/2248Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 6 days ago

Eruption with volcanic ash cloud at 2256 UTC (0556 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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24th of November 2021, 1 week ago

2021-11-24 22:23:00 UTC Orange

Semeru - 20211124/2223Z 

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

Eruption with volcanic ash cloud at 2327 UTC (0527 local). Eruption and ash emission is continuing. 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 west and south west.

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23rd of November 2021, 1 week ago

2021-11-23 00:08:00 UTC Orange

Semeru - 20211123/0008Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 0013 UTC (0713 local) Best estimate of ash-cloud top is around 13683 FT (4276 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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22nd of November 2021, 1 week ago

2021-11-22 22:33:00 UTC Orange

Semeru - 20211122/2233Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 2234 UTC (0534 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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21st of November 2021, 1 week ago

2021-11-21 22:01:00 UTC Orange

Semeru - 20211121/2201Z 

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

Eruption with volcanic ash cloud at 0507 UTC (2207 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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2021-11-21 10:25:00 UTC Orange

Ili Lewotolok - 20211121/1025Z 

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

Eruption with volcanic ash cloud at 1001 UTC (1801 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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2021-11-21 10:12:00 UTC Orange

Ili Lewotolok - 20211121/1012Z 

Yeremias Kristianto Pugel, A.Md., Ili Lewotolok Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 1001UTC (1801local). 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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20th of November 2021, 1 week ago

2021-11-20 22:54:00 UTC Orange

Semeru - 20211120/2254Z 

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

Eruption with volcanic ash cloud at 2300 UTC (0600 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 west.

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19th of November 2021, 1 week ago

2021-11-19 23:49:00 UTC Orange

Ibu - 20211119/2349Z 

Pretina Sitinjak, S.T., Ibu Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 2326 UTC (0826 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. 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.