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
 

26th of April 2022, 3 weeks ago

2022-04-26 22:05:00 UTC Yellow

Batutara - 20220426/2205Z 

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 2041 UTC (1241 local). Best estimate of ash-cloud top is around 9267 FT (2896 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northeast.

View
2022-04-26 17:44:00 UTC Orange

Semeru - 20220426/1744Z 

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

Eruption with volcanic ash cloud at 1749 UTC (0049 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 .

View
2022-04-26 17:09:00 UTC Yellow

Batutara - 20220426/1709Z 

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

Eruption with volcanic ash cloud at 0145 UTC (0945 local). Eruption and ash emission is not continuing. Ash-cloud not visible. fog covered mountain.

View
2022-04-26 11:55:00 UTC Orange

Ibu - 20220426/1155Z 

Axl Roeroe, Ibu Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 1140 UTC (2040 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 northeast..

View
2022-04-26 08:43:00 UTC Orange

Ibu - 20220426/0843Z 

Axl Roeroe, Ibu Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0836 UTC (1736 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 northeast..

View
 

25th of April 2022, 3 weeks ago

2022-04-25 22:23:00 UTC Orange

Semeru - 20220425/2223Z 

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

Eruption with volcanic ash cloud at 2231 UTC (0531 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.

View
2022-04-25 00:58:00 UTC Orange

Ibu - 20220425/0058Z 

Axl Roeroe, Ibu Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0048 UTC (0948 local). Best estimate of ash-cloud top is around 13840 FT (4325 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..

View
 

24th of April 2022, 3 weeks ago

2022-04-24 12:13:00 UTC Orange

Ibu - 20220424/1213Z 

Axl Roeroe, Ibu Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 1210 UTC (2110 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 west..

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

Anak Krakatau - 20220424/0456Z 

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

View
 

23rd of April 2022, 4 weeks ago

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

Anak Krakatau - 20220423/2302Z 

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

View
2022-04-23 22:24:00 UTC Orange

Semeru - 20220423/2224Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2233 UTC (0533 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 west.

View
2022-04-23 07:47:00 UTC Orange

Anak Krakatau - 20220423/0747Z 

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

View
2022-04-23 00:30:00 UTC Orange

Ibu - 20220423/0030Z 

Axl Roeroe, Ibu Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 0020 UTC (0920 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 west..

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

Semeru - 20220423/0002Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 0010 UTC (0710 local) Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.

View
 

22nd of April 2022, 4 weeks ago

2022-04-22 22:17:00 UTC Orange

Semeru - 20220422/2217Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 0024 UTC (0524 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 north.

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.