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
 

16th of May 2017, 4 years ago

2017-05-16 01:38:00 UTC Orange

Ibu - 20170516/0138Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 0038 UTC (0938 local). Best estimate of ash-cloud top is around 16632 FT (5040 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..

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10th of May 2017, 4 years ago

2017-05-10 23:27:00 UTC Orange

Ibu - 20170510/2327Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 2252 UTC (0752 local). Best estimate of ash-cloud top is around 18216 FT (5520 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to Southeast..

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2017-05-10 09:31:00 UTC Orange

Ibu - 20170510/0931Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 0914 UTC (1814 local). Best estimate of ash-cloud top is around 18744 FT (5680 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..

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1st of May 2017, 4 years ago

2017-05-01 23:43:00 UTC Orange

Ibu - 20170501/2343Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 2328 UTC (0828 local). Best estimate of ash-cloud top is around 17160 FT (5200 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest..

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2017-05-01 23:39:00 UTC Orange

Ibu - 20170501/2339Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 2307 UTC (0807 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..

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2017-05-01 07:22:00 UTC Orange

Ibu - 20170501/0722Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 0707 UTC (1607 local). Best estimate of ash-cloud top is around 17160 FT (5200 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast..

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30th of April 2017, 4 years ago

2017-04-30 03:32:00 UTC Orange

Ibu - 20170430/0332Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 0309 UTC (1209 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..

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28th of April 2017, 4 years ago

2017-04-28 23:45:00 UTC Orange

Ibu - 20170428/2345Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 2330 UTC (0830 local). Best estimate of ash-cloud top is around 16632 FT (5040 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..

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26th of April 2017, 4 years ago

2017-04-26 23:39:00 UTC Orange

Ibu - 20170426/2339Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 2158 UTC (0758 local). Best estimate of ash-cloud top is around 18744 FT (5680 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..

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2017-04-26 00:58:00 UTC Orange

Ibu - 20170426/0058Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 0017 UTC (0917 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast..

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21st of April 2017, 4 years ago

2017-04-21 01:01:00 UTC Orange

Ibu - 20170421/0101Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption produced white-grey volcanic ash cloud at 2347 UTC (0847 local). Best estimate of ash-cloud top is around 15576 FT (4720 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..

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20th of April 2017, 4 years ago

2017-04-20 00:36:00 UTC Orange

Ibu - 20170420/0036Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 2323 UTC (0823 local). Best estimate of ash-cloud top is around 19272 FT (5840 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Dark-grey volcanic ash cloud moving to east..

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19th of April 2017, 4 years ago

2017-04-19 09:13:00 UTC Orange

Ibu - 20170419/0913Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 0857 UTC (1757 local). Best estimate of ash-cloud top is around 19272 FT (5840 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..

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18th of April 2017, 4 years ago

2017-04-18 23:35:00 UTC Orange

Ibu - 20170418/2335Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 2310 UTC (0810 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..

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17th of April 2017, 4 years ago

2017-04-17 01:51:00 UTC Orange

Ibu - 20170417/0151Z 

Nia Haerani, Dr. S.T., M.T., Ibu Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 0054 UTC (0954 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..

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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.