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 January 2022, 2 days ago

2022-01-16 22:27:00 UTC Orange

Semeru - 20220116/2227Z 

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

Eruption with volcanic ash cloud at 2234 UTC (0534 local). Eruption and ash emission is continuing. 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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2022-01-16 03:21:00 UTC Orange

Semeru - 20220116/0321Z 

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

Pyroclastic flow occured from the edge of lava deposit at 03:20 UTC ( 1020 local ) Best estimate of ash-cloud top is around 16563 FT (5176 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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15th of January 2022, 3 days ago

2022-01-15 02:13:00 UTC Orange

Semeru - 20220115/0213Z 

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

Eruption with volcanic ash cloud at 0215 UTC (0915 local) Best estimate of ash-cloud top is around 12403 FT (3876 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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11th of January 2022, 1 week ago

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

Ili Lewotolok - 20220111/0100Z 

Nandra Widyawanto, A.Md., Ili Lewotolok Volcano Observatory - 1 week 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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7th of January 2022, 1 week ago

2022-01-07 18:06:00 UTC Orange

Semeru - 20220107/1806Z 

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

Pyroclastic flow occured from the edge of lava deposit at 1759 UTC ( 0059 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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2022-01-07 16:15:00 UTC Orange

Semeru - 20220107/1615Z 

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

Pyroclastic flow occured from the edge of lava deposit at 1611 UTC ( 2311 local ) Best estimate of ash-cloud top is around 12403 FT (3876 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Lava flow is observed through the Southeast direction of the Semeru summit crater..

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5th of January 2022, 1 week ago

2022-01-05 01:39:00 UTC Orange

Semeru - 20220105/0139Z 

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

Pyroclastic flow occured from the edge of lava deposit at 0135 UTC ( 0835 local ) Best estimate of ash-cloud top is around 16563 FT (5176 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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4th of January 2022, 2 weeks ago

2022-01-04 02:28:00 UTC Orange

Ili Lewotolok - 20220104/0228Z 

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

Eruption with volcanic ash cloud at 0229 UTC (1025 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 East southeast.

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3rd of January 2022, 2 weeks ago

2022-01-03 22:36:00 UTC Orange

Semeru - 20220103/2236Z 

Liswanto, A.P., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 2238 UTC (0538 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 vertical.

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2022-01-03 05:45:00 UTC Orange

Semeru - 20220103/0545Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 2 weeks ago

Pyroclastic flow occured from the edge of lava deposit at 0525 UTC ( 1225 local ) Ash-cloud not visible. Ash-cloud moving to southeast..

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2022-01-03 03:28:00 UTC Orange

Semeru - 20220103/0328Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0334 UTC (1034 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 14323 FT (4476 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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30th of December 2021, 2 weeks ago

2021-12-30 21:40:00 UTC Orange

Semeru - 20211230/2140Z 

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

Pyroclastic flow occured from the edge of lava deposit at 2131 UTC ( 0431 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 north.

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28th of December 2021, 3 weeks ago

2021-12-28 01:55:00 UTC Orange

Semeru - 20211228/0155Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0202 UTC (0902 local). Eruption and ash emission is continuing 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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25th of December 2021, 3 weeks ago

2021-12-25 10:05:00 UTC Orange

Semeru - 20211225/1005Z 

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

Eruption with volcanic ash cloud at 1006 UTC (1706 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 southwest.

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24th of December 2021, 3 weeks ago

2021-12-24 16:31:00 UTC Orange

Semeru - 20211224/1631Z 

Liswanto, A.P., Semeru Volcano Observatory - 3 weeks ago

Pyroclastic flow occured from the edge of lava deposit at 1619 UTC (2319) 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 southwest.

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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.