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
 

30th of May 2021, 2 months ago

2021-05-30 23:31:00 UTC Yellow

Kerinci - 20210530/2331Z 

Irwan Safwan, S.T., Kerinci Volcano Observatory - 2 months ago

Gas emission at 1114 UTC (0614 lokal). Best estimate of ash-cloud top is around 14416 FT (4505 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Volcanic Plume moving to nort west.

View
2021-05-30 22:27:00 UTC Orange

Semeru - 20210530/2227Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2234 UTC (0534 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
 

29th of May 2021, 2 months ago

2021-05-29 22:49:00 UTC Orange

Semeru - 20210529/2249Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2256 UTC (0556 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
2021-05-29 01:49:00 UTC Orange

Semeru - 20210529/0149Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0158 UTC (2858 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
 

28th of May 2021, 2 months ago

2021-05-28 08:57:00 UTC Orange

Ili Lewotolok - 20210528/0857Z 

Fadlan Djamil, A.Md., Ili Lewotolok Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0952 UTC (1652 local). 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 east.

View
 

26th of May 2021, 2 months ago

2021-05-26 23:57:00 UTC Orange

Semeru - 20210526/2357Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0003 UTC (0703local) 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 south.

View
 

23rd of May 2021, 2 months ago

2021-05-23 18:13:00 UTC Orange

Ili Lewotolok - 20210523/1813Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0610 UTC (0210 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 east .

View
 

22nd of May 2021, 2 months ago

2021-05-22 04:09:00 UTC Orange

Ili Lewotolok - 20210522/0409Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0354 UTC (1154 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 West.

View
2021-05-22 03:15:00 UTC Orange

Ili Lewotolok - 20210522/0315Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0309 UTC (1109 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 West.

View
 

21st of May 2021, 2 months ago

2021-05-21 22:54:00 UTC Orange

Semeru - 20210521/2254Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2304UTC (0604 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
2021-05-21 16:37:00 UTC Orange

Ili Lewotolok - 20210521/1637Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 1614 UTC (0014 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6794 FT (2123 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
 

20th of May 2021, 2 months ago

2021-05-20 23:22:00 UTC Orange

Semeru - 20210520/2322Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2327 UTC (0627 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
 

18th of May 2021, 2 months ago

2021-05-18 23:40:00 UTC Orange

Semeru - 20210518/2340Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2348 UTC (0648 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
 

17th of May 2021, 2 months ago

2021-05-17 01:39:00 UTC Orange

Ibu - 20210517/0139Z 

Novia Antika Anggraeni, S.Si., Ibu Volcano Observatory - 2 months ago

Eruption with volcanic ash-cloud at 0139 UTC (1039 local). Best estimate of ash-cloud top is around 6800 FT (2125 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to north.

View
2021-05-17 01:15:00 UTC Orange

Semeru - 20210517/0115Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0118 UTC (0818 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 south.

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.