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
 

28th of July 2021, 1 week ago

2021-07-28 01:51:00 UTC Orange

Semeru - 20210728/0151Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 6 days ago

Eruption with volcanic ash cloud at 0158 UTC (0858 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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25th of July 2021, 1 week ago

2021-07-25 07:12:00 UTC Orange

Semeru - 20210725/0712Z 

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

Eruption with volcanic ash cloud at 0720 UTC (1420 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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14th of July 2021, 3 weeks ago

2021-07-14 03:39:00 UTC Orange

Semeru - 20210714/0339Z 

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

Eruption with volcanic ash cloud at 0446 UTC (1146 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 southwest..

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6th of July 2021, 4 weeks ago

2021-07-06 01:44:00 UTC Orange

Semeru - 20210706/0144Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 0150 UTC (0850 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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4th of July 2021, 1 month ago

2021-07-04 23:24:00 UTC Orange

Semeru - 20210704/2324Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 2335 UTC (0635 local). Eruption and ash emission is continuing. 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 north..

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24th of June 2021, 1 month ago

2021-06-24 00:52:00 UTC Orange

Semeru - 20210624/0052Z 

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

Eruption with volcanic ash cloud at 0055 UTC (0755 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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19th of June 2021, 1 month ago

2021-06-19 23:18:00 UTC Orange

Semeru - 20210619/2318Z 

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

Eruption with volcanic ash cloud at 2325 UTC (0625 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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16th of June 2021, 1 month ago

2021-06-16 23:41:00 UTC Orange

Semeru - 20210616/2341Z 

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

Eruption with volcanic ash cloud at 2350 UTC (0650 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 south..

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15th of June 2021, 1 month ago

2021-06-15 23:17:00 UTC Orange

Semeru - 20210615/2317Z 

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

Eruption with volcanic ash cloud at 2323 UTC (0623 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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10th of June 2021, 1 month ago

2021-06-10 22:04:00 UTC Orange

Semeru - 20210610/2204Z 

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

Eruption with volcanic ash cloud at 2211 UTC (0511 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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6th of June 2021, 1 month ago

2021-06-06 23:52:00 UTC Orange

Semeru - 20210606/2352Z 

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

Eruption with volcanic ash cloud at 0000 UTC (0700 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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3rd of June 2021, 2 months ago

2021-06-03 01:19:00 UTC Orange

Semeru - 20210603/0119Z 

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

Eruption with volcanic ash cloud at 0123 UTC (0823 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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1st of June 2021, 2 months ago

2021-06-01 23:08:00 UTC Orange

Semeru - 20210601/2308Z 

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

Eruption with volcanic ash cloud at 2316 UTC (0616 local). Eruption and ash emission is continuing 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 southeast.

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30th of May 2021, 2 months ago

2021-05-30 22:27:00 UTC Orange

Semeru - 20210530/2227Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 months 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 north.

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29th of May 2021, 2 months ago

2021-05-29 22:49:00 UTC Orange

Semeru - 20210529/2249Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 months 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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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.