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
 

14th of April 2022, 5 months ago

2022-04-14 20:46:00 UTC Orange

Anak Krakatau - 20220414/2046Z 

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

Eruption with ash clouds at 20:27 UTC (03:27 local time). The eruption lasted for 305 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 white-black eruption smoke 1000m from the top of the volcano, the wind direction slowly to the southwest..

View
 

30th of March 2022, 6 months ago

2022-03-30 06:21:00 UTC Orange

Anak Krakatau - 20220330/0621Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 06:26 UTC (13:26 local time). The eruption lasted for 96 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-black eruption smoke 700m from the top of the volcano, the wind direction slowly to the northeast..

View
 

29th of March 2022, 6 months ago

2022-03-29 13:20:00 UTC Orange

Anak Krakatau - 20220329/1320Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 13:20 UTC (20:19 local time). The eruption lasted for 74 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 eruption smoke 500m from the top of the volcano, the wind direction slowly to the east..

View
2022-03-29 05:40:00 UTC Orange

Anak Krakatau - 20220329/0540Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 05:40 UTC (12:40 local time). The eruption lasted for 35 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 eruption smoke 500m from the top of the volcano, the wind direction slowly to the east..

View
 

28th of March 2022, 6 months ago

2022-03-28 10:15:00 UTC Orange

Anak Krakatau - 20220328/1015Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 10:15 UTC (17:15 local time). The eruption lasted for 294 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 east..

View
 

27th of March 2022, 6 months ago

2022-03-27 13:11:00 UTC Orange

Anak Krakatau - 20220327/1311Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 13:13 UTC (20:13 local time). The eruption lasted for 106 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. Visuals directly from the cctv were observed eruptions with the color of the thick grey eruption smoke 600m from the top of the volcano, the wind direction slowly to the north east..

View
2022-03-27 11:30:00 UTC Orange

Anak Krakatau - 20220327/1130Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 11:21 UTC (18:21 local time). The eruption lasted for 100 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 grey eruption smoke 400m from the top of the volcano, the wind direction slowly to the north east..

View
 

26th of March 2022, 6 months ago

2022-03-26 10:42:00 UTC Orange

Anak Krakatau - 20220326/1042Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 10:43 UTC (17:43 local time). The eruption lasted for 62 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 eruption smoke 500m from the top of the volcano, the wind direction slowly to the southeast..

View
 

25th of March 2022, 6 months ago

2022-03-25 07:37:00 UTC Orange

Anak Krakatau - 20220325/0737Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 7:37 UTC (14:37 local time). The eruption lasted for 114 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 gray black eruption smoke 2000m from the top of the volcano, the wind direction slowly to the southwest..

View
2022-03-25 02:54:00 UTC Orange

Anak Krakatau - 20220325/0254Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 02:55 UTC (09:55 local time). The eruption lasted for 104 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 moving to east.

View
2022-03-25 01:07:00 UTC Orange

Anak Krakatau - 20220325/0107Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 01:09 UTC (08:09 local time). The eruption lasted for 122 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 east..

View
2022-03-25 00:46:00 UTC Orange

Anak Krakatau - 20220325/0046Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 00:47 UTC (07:47 local time). The eruption lasted for 49 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 1000 m from the top of the volcano, the wind direction slowly to the east..

View
 

24th of March 2022, 6 months ago

2022-03-24 22:33:00 UTC Orange

Anak Krakatau - 20220324/2233Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with ash clouds at 23:43 UTC (05:43 local time). The eruption lasted for 176 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 east.

View
2022-03-24 04:27:00 UTC Orange

Anak Krakatau - 20220324/0427Z 

Hetty Triastuty, Dr. S.Si, M.Sc, Anak Krakatau Volcano Observatory - 6 months ago

Eruption with volcanic ash cloud observed at 04:10 UTC (11:10 local). Eruption and ash emission is still continuing. Best estimate of ash-cloud top is around 4205 FT (1314 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Volcanic ash cloud is moving south, as observed from a CCTV at Sertung Island..

View
2022-03-24 03:10:00 UTC Yellow

Anak Krakatau - 20220324/0310Z 

Jumono, Anak Krakatau Volcano Observatory - 6 months ago

Gas emission was observed on 02:12 UTC (09:12 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. White-colored gas emission is moving southeast, as observed from a CCTV at Sertung Island..

View
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.