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
 

4th of August 2022, 1 month ago

2022-08-04 02:31:00 UTC Orange

Anak Krakatau - 20220804/0231Z 

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

Eruption with ash clouds at 02:26 UTC (09:26 local time). The eruption lasted for 52 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 grey eruption smoke 1500m from the top of the volcano, the wind direction slowly to the north..

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3rd of August 2022, 1 month ago

2022-08-03 09:16:00 UTC Orange

Anak Krakatau - 20220803/0916Z 

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

Eruption with ash clouds at 08:40 UTC (15:40 local time). The eruption lasted for 776 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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2nd of August 2022, 1 month ago

2022-08-02 18:22:00 UTC Orange

Anak Krakatau - 20220802/1822Z 

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

Eruption with ash clouds at 18:15 UTC (01:15 local time). The eruption lasted for 52 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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2022-08-02 17:46:00 UTC Orange

Anak Krakatau - 20220802/1746Z 

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

Eruption with ash clouds at 17:34 UTC (00:34 local time). The eruption lasted for 39 seconds. Best estimate of ash-cloud top is around 1142 FT (357 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 200m from the top of the volcano, the wind direction slowly to the southwest..

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2022-08-02 16:06:00 UTC Orange

Anak Krakatau - 20220802/1606Z 

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

Eruption with ash clouds at 15:49 UTC (22:49 local time). The eruption lasted for 66 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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2022-08-02 12:26:00 UTC Orange

Anak Krakatau - 20220802/1226Z 

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

Eruption with ash clouds at 12:06 UTC (19:06 local time). The eruption lasted for 95 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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2022-08-02 09:39:00 UTC Orange

Anak Krakatau - 20220802/0939Z 

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

Eruption with ash clouds at 08:49 UTC (15:49 local time). The eruption lasted for 32 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 grey eruption smoke 1500m from the top of the volcano, the wind direction slowly to the northeast..

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18th of July 2022, 2 months ago

2022-07-18 10:37:00 UTC Orange

Anak Krakatau - 20220718/1037Z 

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

Eruption with ash clouds at 10:30 UTC (17:30 local time). The eruption lasted for 73 seconds. Best estimate of ash-cloud top is around 8502 FT (2657 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 2500m from the top of the volcano, the wind direction slowly to the southwest..

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2022-07-18 08:54:00 UTC Orange

Anak Krakatau - 20220718/0854Z 

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

Eruption with ash clouds at 08:49 UTC (15:49 local time). The eruption lasted for 97 seconds Best estimate of ash-cloud top is around 8502 FT (2657 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 2500m from the top of the volcano, the wind direction slowly to the west..

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2022-07-18 01:33:00 UTC Orange

Anak Krakatau - 20220718/0133Z 

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

Eruption with ash clouds at 01:26 UTC (08:26 local time). The eruption lasted for 127seconds. 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 grey eruption smoke 2000m from the top of the volcano, the wind direction slowly to the southwest..

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17th of July 2022, 2 months ago

2022-07-17 01:54:00 UTC Orange

Anak Krakatau - 20220717/0154Z 

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

Eruption with ash clouds at 01:47 UTC (08:47 local time). The eruption lasted for 79 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 grey eruption smoke 20000m from the top of the volcano, the wind direction slowly to the south.

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16th of July 2022, 2 months ago

2022-07-16 16:48:00 UTC Orange

Anak Krakatau - 20220716/1648Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 months ago

Eruption with ash clouds at 16:39 UTC (23:39 local time). The eruption lasted for 35 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 Northeast..

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2022-07-16 16:14:00 UTC Orange

Anak Krakatau - 20220716/1614Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 months ago

Eruption with ash clouds at 15:53 UTC (22:53 local time). The eruption lasted for 27 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 the northeast..

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30th of June 2022, 2 months ago

2022-06-30 23:55:00 UTC Orange

Anak Krakatau - 20220630/2355Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 months ago

Eruption with ash clouds at 23:50 UTC (06:50 local time). The eruption lasted for 77 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 northeast..

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2022-06-30 11:34:00 UTC Orange

Anak Krakatau - 20220630/1134Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 months ago

Eruption with ash clouds at 11:17 UTC (18:17 local time). The eruption lasted for 169 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 northeast..

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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.