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
 

24th of April 2022, 1 month ago

2022-04-24 04:56:00 UTC Orange

Anak Krakatau - 20220424/0456Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 05.00 UTC (12.00 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 10102 FT (3157 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick white-grey-black eruption smoke 3000m from the top of the volcano, the wind direction slowly to the south-southwest..

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23rd of April 2022, 1 month ago

2022-04-23 23:02:00 UTC Orange

Anak Krakatau - 20220423/2302Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 23.08 UTC (06.08 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 10102 FT (3157 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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2022-04-23 07:47:00 UTC Orange

Anak Krakatau - 20220423/0747Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud 07.34 UTC (14.34 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 10102 FT (3157 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 3000m from the top of the volcano, the wind direction slowly to the southwest and south..

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22nd of April 2022, 1 month ago

2022-04-22 10:27:00 UTC Orange

Anak Krakatau - 20220422/1027Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 10:30 UTC (17:30 local time). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 3062 FT (957 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 800m from the top of the volcano, the wind direction slowly to the southwest..

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21st of April 2022, 1 month ago

2022-04-21 19:45:00 UTC Orange

Anak Krakatau - 20220421/1945Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 19:37 UTC (02:37 local time). The eruption lasted for 45 seconds. Best estimate of ash-cloud top is around 5302 FT (1657 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 1500m from the top of the volcano, the wind direction slowly to the southwest..

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2022-04-21 17:57:00 UTC Orange

Anak Krakatau - 20220421/1757Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 17:49 UTC (00:49 local time). The eruption lasted for 79 seconds. Best estimate of ash-cloud top is around 2102 FT (657 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 500m from the top of the volcano, the wind direction slowly to the southwest..

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20th of April 2022, 1 month ago

2022-04-20 23:20:00 UTC Orange

Anak Krakatau - 20220420/2320Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 23:21 UTC (06:21 local time). The eruption lasted for 75 seconds Best estimate of ash-cloud top is around 3062 FT (957 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 800m from the top of the volcano, the wind direction slowly to the east..

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18th of April 2022, 1 month ago

2022-04-18 08:52:00 UTC Orange

Anak Krakatau - 20220418/0852Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 08:58 UTC (15:58 local time). The eruption lasted for 68 seconds. Best estimate of ash-cloud top is around 3702 FT (1157 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick grey-black eruption smoke 1000m from the top of the volcano, the wind direction slowly to the southwest..

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2022-04-18 06:25:00 UTC Orange

Anak Krakatau - 20220418/0625Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 06:30 UTC (13:30 local time). The eruption lasted for 56 seconds. Best estimate of ash-cloud top is around 6902 FT (2157 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick grey-black eruption smoke 2000m from the top of the volcano, the wind direction slowly to the southwest..

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2022-04-18 05:45:00 UTC Orange

Anak Krakatau - 20220418/0545Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 05:46 UTC (12:46 local time). The eruption lasted for 53 seconds. Best estimate of ash-cloud top is around 2742 FT (857 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick grey eruption smoke 700m from the top of the volcano, the wind direction slowly to the southwest..

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2022-04-18 00:15:00 UTC Orange

Anak Krakatau - 20220418/0015Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 00:14 UTC (07:14 local time). The eruption lasted for 97 seconds. Best estimate of ash-cloud top is around 2742 FT (857 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 700m from the top of the volcano, the wind direction slowly to the southwest..

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17th of April 2022, 1 month ago

2022-04-17 21:30:00 UTC Orange

Anak Krakatau - 20220417/2130Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 21:19 UTC (04:19 local time). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 3062 FT (957 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 800m from the top of the volcano, the wind direction slowly to the southwest..

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2022-04-17 14:11:00 UTC Orange

Anak Krakatau - 20220417/1411Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Eruption with ash clouds at 17:15 UTC (21:15 local time). The eruption lasted for 40 seconds. Best estimate of ash-cloud top is around 3062 FT (957 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick grey-black eruption smoke 800m from the top of the volcano, the wind direction slowly to the southwest..

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2022-04-17 13:46:00 UTC Orange

Anak Krakatau - 20220417/1346Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

strombolian eruption with thick ash cloud at 11:30 UTC (18:30 Local) and ash emission is continuning Best estimate of ash-cloud top is around 2422 FT (757 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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2022-04-17 02:45:00 UTC Yellow

Anak Krakatau - 20220417/0245Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Volcanic ash emission is continuing at 06:25 utc (09:25 local) Best estimate of ash-cloud top is around 2605 FT (814 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. ash-cloud moving to south 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.