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
 

29th of May 2020, 1 month ago

2020-05-29 00:26:00 UTC Orange

Dukono - 20200529/0026Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2353 UTC (0853 local). Best estimate of ash-cloud top is around 4893 FT (1529 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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28th of May 2020, 1 month ago

2020-05-28 23:22:00 UTC Orange

Semeru - 20200528/2322Z 

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

Eruption with volcanic ash cloud at 2319 UTC (0619 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.

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26th of May 2020, 1 month ago

2020-05-26 09:35:00 UTC Orange

Dukono - 20200526/0935Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0924 UTC (1824 local). Best estimate of ash-cloud top is around 5533 FT (1729 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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25th of May 2020, 1 month ago

2020-05-25 22:59:00 UTC Orange

Semeru - 20200525/2259Z 

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

Eruption with volcanic ash cloud at 2258 UTC (0558 local). Best estimate of ash-cloud top is around 12723 FT (3976 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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2020-05-25 08:02:00 UTC Orange

Dukono - 20200525/0802Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0756 UTC (1656 local). Best estimate of ash-cloud top is around 5853 FT (1829 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. -cloud moving to south, southwest.

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24th of May 2020, 1 month ago

2020-05-24 22:36:00 UTC Orange

Semeru - 20200524/2236Z 

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

Eruption with volcanic ash cloud at 2235 UTC (0535 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..

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2020-05-24 01:46:00 UTC Orange

Semeru - 20200524/0146Z 

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

Eruption with volcanic ash cloud at 0149 UTC (0849 local) Best estimate of ash-cloud top is around 12403 FT (3876 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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2020-05-24 00:29:00 UTC Orange

Dukono - 20200524/0029Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0013 UTC (0913 local). Best estimate of ash-cloud top is around 5213 FT (1629 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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23rd of May 2020, 1 month ago

2020-05-23 08:12:00 UTC Orange

Dukono - 20200523/0812Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0726 UTC ( 1626 local). Best estimate of ash-cloud top is around 5213 FT (1629 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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21st of May 2020, 1 month ago

2020-05-21 04:35:00 UTC Orange

Dukono - 20200521/0435Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0333 UTC (1233 local). Best estimate of ash-cloud top is around 5213 FT (1629 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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19th of May 2020, 1 month ago

2020-05-19 22:43:00 UTC Orange

Ibu - 20200519/2243Z 

Novia Antika Anggraeni, S.Si., Ibu Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2213 UTC (0713 local Best estimate of ash-cloud top is around 5840 FT (1825 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White to grey ash-cloud moving to west.

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18th of May 2020, 1 month ago

2020-05-18 23:10:00 UTC Orange

Semeru - 20200518/2310Z 

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

Eruption with volcanic ash cloud at 2306 UTC (0606 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 south..

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17th of May 2020, 1 month ago

2020-05-17 00:22:00 UTC Orange

Semeru - 20200517/0022Z 

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

Eruption with volcanic ash cloud at 0022 UTC (0722 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.

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16th of May 2020, 1 month ago

2020-05-16 02:53:00 UTC Orange

Semeru - 20200516/0253Z 

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

Eruption with volcanic ash cloud at 0249 UTC (0949 local). Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west.

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15th of May 2020, 1 month ago

2020-05-15 22:58:00 UTC Orange

Ibu - 20200515/2258Z 

Novia Antika Anggraeni, S.Si., Ibu Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2250 UTC (0750 local) Best estimate of ash-cloud top is around 5200 FT (1625 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White to grey ash-cloud moving to west.

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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.