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 June 2022, 2 months ago

2022-06-29 07:56:00 UTC Orange

Anak Krakatau - 20220629/0756Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 2 months ago

Eruption with ash clouds at 07:51UTC (14:51 local time). The eruption lasted for 116 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 black eruption smoke 2000m from the top of the volcano, the wind direction slowly to the north..

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28th of June 2022, 2 months ago

2022-06-28 21:45:00 UTC Orange

Anak Krakatau - 20220628/2145Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 2 months ago

Eruption with ash clouds at 22:36 UTC (04:36 local time). The eruption lasted for 77 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 black eruption smoke 1000m from the top of the volcano, the wind direction slowly to north..

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2022-06-28 19:17:00 UTC Orange

Anak Krakatau - 20220628/1917Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 2 months ago

Eruption with ash clouds at 07:09 UTC (02:09 local time). The eruption lasted for 24 seconds. Best estimate of ash-cloud top is around 1782 FT (557 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 400m from the top of the volcano, the wind direction slowly to the north..

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25th of June 2022, 3 months ago

2022-06-25 10:23:00 UTC Orange

Anak Krakatau - 20220625/1023Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 10:12 UTC (17:12 local time). The eruption lasted for 30 seconds Best estimate of ash-cloud top is around 1782 FT (557 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 400m from the top of the volcano, the wind direction slowly to the southwest..

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17th of June 2022, 3 months ago

2022-06-17 11:46:00 UTC Orange

Anak Krakatau - 20220617/1146Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 11:39 UTC (18:39 local time). The eruption lasted for 84 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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2022-06-17 07:51:00 UTC Orange

Anak Krakatau - 20220617/0751Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 07:45 UTC (14:45 local time). The eruption lasted for 71 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 south..

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16th of June 2022, 3 months ago

2022-06-16 17:52:00 UTC Orange

Anak Krakatau - 20220616/1752Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 17:42 UTC (00:42 local time). The eruption lasted for 53 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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2022-06-16 05:47:00 UTC Orange

Anak Krakatau - 20220616/0547Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 05:41 UTC (12:41 local time). The eruption lasted for 41 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 grey-black eruption smoke 500m from the top of the volcano, the wind direction slowly to the north..

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15th of June 2022, 3 months ago

2022-06-15 14:33:00 UTC Orange

Anak Krakatau - 20220615/1433Z 

Jumono, Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 14:19 UTC (21:19 local time). The eruption lasted for 30 seconds. Best estimate of ash-cloud top is around 1462 FT (457 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to south.

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2022-06-15 06:51:00 UTC Orange

Anak Krakatau - 20220615/0651Z 

Jumono, Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 06:37 UTC (13:37 local time). The eruption lasted for 82 seconds. 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 is moving to south.

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14th of June 2022, 3 months ago

2022-06-14 23:54:00 UTC Orange

Anak Krakatau - 20220614/2354Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 23:37 UTC (06:37 local time). The eruption lasted for 76 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 grey-black eruption smoke 500m from the top of the volcano, the wind direction slowly to the north..

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8th of June 2022, 3 months ago

2022-06-08 17:24:00 UTC Orange

Anak Krakatau - 20220608/1724Z 

Jumono, Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 16:59 UTC (23:59 local time). The eruption lasted for 131 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 light of fire is lk meters high.

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2022-06-08 06:10:00 UTC Orange

Anak Krakatau - 20220608/0610Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 3 months ago

Eruption with ash clouds at 06:05 UTC (13:05 local time). The eruption lasted for 75 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 south..

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24th of April 2022, 5 months ago

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

Anak Krakatau - 20220424/0456Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 5 months 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, 5 months ago

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

Anak Krakatau - 20220423/2302Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 5 months 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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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.