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
 

21st of April 2020, 1 year ago

2020-04-21 01:58:00 UTC Orange

Semeru - 20200421/0158Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 year ago

Ruption with volcanic ash cloud at 0159 UTC (0859 local) Best estimate of ash-cloud top is around 44098 FT (13363 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
 

19th of April 2020, 1 year ago

2020-04-19 23:21:00 UTC Orange

Semeru - 20200419/2321Z 

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

Eruption with volcanic ash cloud at 1028 UTC (0528 local) Best estimate of ash-cloud top is around 41986 FT (12723 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 April 2020, 1 year ago

2020-04-18 22:30:00 UTC Orange

Semeru - 20200418/2230Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 2232 UTC (0532 local) Best estimate of ash-cloud top is around 41986 FT (12723 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 April 2020, 1 year ago

2020-04-16 02:04:00 UTC Orange

Semeru - 20200416/0204Z 

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

Eruption with volcanic ash cloud at 0204 UTC (0904 local). Best estimate of ash-cloud top is around 43042 FT (13043 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
 

15th of April 2020, 1 year ago

2020-04-15 00:10:00 UTC Orange

Semeru - 20200415/0010Z 

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

Eruption with volcanic ash cloud at 0005 UTC (0705 local). Best estimate of ash-cloud top is around 45154 FT (13683 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
 

12th of April 2020, 1 year ago

2020-04-12 22:58:00 UTC Orange

Semeru - 20200412/2258Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 2259 UTC (0559 local) Best estimate of ash-cloud top is around 45154 FT (13683 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
 

11th of April 2020, 1 year ago

2020-04-11 22:29:00 UTC Orange

Semeru - 20200411/2229Z 

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

Eruption with volcanic ash cloud at 1028 UTC (0528 local) Best estimate of ash-cloud top is around 43042 FT (13043 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
2020-04-11 02:37:00 UTC Orange

Semeru - 20200411/0237Z 

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

Eruption with volcanic ash cloud at 0222 UTC (0922 local). Best estimate of ash-cloud top is around 43042 FT (13043 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
 

9th of April 2020, 1 year ago

2020-04-09 23:03:00 UTC Orange

Semeru - 20200409/2303Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 2306UTC (0606 local) Best estimate of ash-cloud top is around 43042 FT (13043 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
2020-04-09 02:51:00 UTC Orange

Semeru - 20200409/0251Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 0252 UTC (0952 local). Best estimate of ash-cloud top is around 43042 FT (13043 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
 

5th of March 2020, 1 year ago

2020-03-05 00:38:00 UTC Orange

Semeru - 20200305/0038Z 

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

Eruption with volcanic ash cloud at 0040 UTC (0740 local). Best estimate of ash-cloud top is around 40930 FT (12403 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
 

3rd of March 2020, 1 year ago

2020-03-03 23:12:00 UTC Orange

Semeru - 20200303/2312Z 

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

Eruption with volcanic ash cloud at 2252 UTC (0552 local) Best estimate of ash-cloud top is around 40930 FT (12403 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
 

4th of February 2020, 1 year ago

2020-02-04 23:30:00 UTC Orange

Semeru - 20200204/2330Z 

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

Eruption with volcanic ash cloud at 2326 UTC (0626 local). Best estimate of ash-cloud top is around 43042 FT (13043 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
2020-02-04 00:36:00 UTC Orange

Semeru - 20200204/0036Z 

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

Eruption with volcanic ash cloud at 0033 UTC (0733 local). Best estimate of ash-cloud top is around 43042 FT (13043 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
 

1st of February 2020, 1 year ago

2020-02-01 23:05:00 UTC Orange

Semeru - 20200201/2305Z 

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

Eruption with volcanic ash cloud at 2256 UTC (0556 local). Best estimate of ash-cloud top is around 44098 FT (13363 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.