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
 

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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2022-04-29 06:00:00 UTC Yellow

Batutara - 20220429/0600Z 

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

There is no eruption activity but show an increasing in degassing at 0538 UTC (1338 local). Best estimate of ash-cloud top is around 3994 FT (1248 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 00:51:00 UTC Orange

Ibu - 20220429/0051Z 

Axl Roeroe, Ibu Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0051 UTC (0951 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 northeast..

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28th of April 2022, 3 weeks ago

2022-04-28 23:41:00 UTC Orange

Semeru - 20220428/2341Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2349 UTC (0649 local) 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 southwest.

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2022-04-28 22:22:00 UTC Orange

Semeru - 20220428/2222Z 

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

Eruption with volcanic ash cloud at 2202 UTC (0502 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 Southwest .

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2022-04-28 11:19:00 UTC Yellow

Batutara - 20220428/1119Z 

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

The eruption has not yet occurred but an increase in degassing has been observed, at 0817 UTC (1617 local). Best estimate of ash-cloud top is around 6234 FT (1948 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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2022-04-28 11:06:00 UTC Yellow

Batutara - 20220428/1106Z 

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

The eruption has not yet occurred but an increase in degassing has been observed at 0753 UTC (1453 local). Best estimate of ash-cloud top is around 5594 FT (1748 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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2022-04-28 05:41:00 UTC Orange

Ibu - 20220428/0541Z 

Axl Roeroe, Ibu Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0526 UTC (1426 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 northwest..

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

Ibu - 20220428/0001Z 

Axl Roeroe, Ibu Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2343 UTC (0843 local). Best estimate of ash-cloud top is around 12240 FT (3825 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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27th of April 2022, 3 weeks ago

2022-04-27 22:49:00 UTC Orange

Semeru - 20220427/2249Z 

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

Eruption with volcanic ash cloud at 2257 UTC (0557 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..

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2022-04-27 22:15:00 UTC Orange

Semeru - 20220427/2215Z 

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

Eruption with volcanic ash cloud at 2253 UTC (0523 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 southeast..

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2022-04-27 00:03:00 UTC Orange

Ibu - 20220427/0003Z 

Axl Roeroe, Ibu Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0002 UTC (0902 local). Best estimate of ash-cloud top is around 9040 FT (2825 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 April 2022, 3 weeks ago

2022-04-26 23:50:00 UTC Orange

Ibu - 20220426/2350Z 

Axl Roeroe, Ibu Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2349 UTC (0849 local) Best estimate of ash-cloud top is around 6160 FT (1925 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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2022-04-26 22:15:00 UTC Orange

Semeru - 20220426/2215Z 

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

Eruption with volcanic ash cloud at 2222 UTC (0522 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 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.