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
 

5th of July 2021, 4 weeks ago

2021-07-05 22:55:00 UTC Orange

Ili Lewotolok - 20210705/2255Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 2252 UTC (0652 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.

View
2021-07-05 01:26:00 UTC Orange

Ili Lewotolok - 20210705/0126Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 0036 UTC (0836 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 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
 

4th of July 2021, 1 month ago

2021-07-04 23:24:00 UTC Orange

Semeru - 20210704/2324Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 2335 UTC (0635 local). Eruption and ash emission is continuing. 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
2021-07-04 15:11:00 UTC Orange

Sinabung - 20210704/1511Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 4 weeks ago

Eruption with ash clouds at 15:15 UTC (22:15 local time). The eruption lasted for 95 seconds. Ash-cloud not visible. The ashes are not observed because of closed fog.

View
 

29th of June 2021, 1 month ago

2021-06-29 04:50:00 UTC Orange

Merapi - 20210629/0450Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0432 UTC (1132 local). The eruption has stopped. Best estimate of ash-cloud top is around 11098 FT (3468 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud generated by PDC moving to the west. .

View
 

24th of June 2021, 1 month ago

2021-06-24 22:56:00 UTC Orange

Merapi - 20210624/2256Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2144 UTC (0444 local). Eruption has stopped. Best estimate of ash-cloud top is around 12698 FT (3968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Wind direction to southeast. .

View
2021-06-24 00:52:00 UTC Orange

Semeru - 20210624/0052Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0055 UTC (0755 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 southwest.

View
 

21st of June 2021, 1 month ago

2021-06-21 14:35:00 UTC Orange

Ili Lewotolok - 20210621/1435Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1426 UTC (2226 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 11507 FT (3596 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
 

19th of June 2021, 1 month ago

2021-06-19 23:18:00 UTC Orange

Semeru - 20210619/2318Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2325 UTC (0625 local). Eruption and ash emission is continuing. 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
 

16th of June 2021, 1 month ago

2021-06-16 23:41:00 UTC Orange

Semeru - 20210616/2341Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2350 UTC (0650 local). Eruption and ash emission is continuing. 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 south..

View
2021-06-16 04:29:00 UTC Orange

Ili Lewotolok - 20210616/0429Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0423 UTC (1223 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 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
 

15th of June 2021, 1 month ago

2021-06-15 23:17:00 UTC Orange

Semeru - 20210615/2317Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2323 UTC (0623 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 southwest.

View
2021-06-15 00:41:00 UTC Orange

Ili Lewotolok - 20210615/0041Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2346 UTC (0746 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 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
 

14th of June 2021, 1 month ago

2021-06-14 02:32:00 UTC Orange

Ili Lewotolok - 20210614/0232Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0214 UTC (1014 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6474 FT (2023 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
 

13th of June 2021, 1 month ago

2021-06-13 23:37:00 UTC Orange

Ili Lewotolok - 20210613/2337Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1134 UTC (0734 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 11667 FT (3646 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west and northwest.

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.