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
 

22nd of June 2020, 2 weeks ago

2020-06-22 03:23:00 UTC Orange

Semeru - 20200622/0323Z 

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

Eruption with volcanic ash cloud at 0326 UTC (1026 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 southeast..

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21st of June 2020, 3 weeks ago

2020-06-21 09:16:00 UTC Yellow

Merapi - 20200621/0916Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 3 weeks ago

Ash-cloud is not visible after eruptions on 0213 and 0227 UTC. Ash-cloud not visible. Ash-cloud is not visible..

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2020-06-21 02:48:00 UTC Red

Merapi - 20200621/0248Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0213 UTC (0913 local) and 0227 UTC (0927 local) Best estimate of ash-cloud top is around 28698 FT (8968 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 June 2020, 3 weeks ago

2020-06-19 23:44:00 UTC Orange

Semeru - 20200619/2344Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2346 UTC (0646 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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2020-06-19 04:24:00 UTC Orange

Dukono - 20200619/0424Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0129 UTC (1029 local). Best estimate of ash-cloud top is around 4253 FT (1329 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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18th of June 2020, 3 weeks ago

2020-06-18 22:59:00 UTC Orange

Semeru - 20200618/2259Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 3 weeks 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 west.

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17th of June 2020, 3 weeks ago

2020-06-17 03:20:00 UTC Orange

Dukono - 20200617/0320Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0110 UTC (1010 local). Best estimate of ash-cloud top is around 4573 FT (1429 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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16th of June 2020, 3 weeks ago

2020-06-16 00:20:00 UTC Orange

Dukono - 20200616/0020Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2250 UTC (0750 local). Best estimate of ash-cloud top is around 6493 FT (2029 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west, northwest.

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15th of June 2020, 3 weeks ago

2020-06-15 02:36:00 UTC Orange

Semeru - 20200615/0236Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0237 UTC (0937 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 west.

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12th of June 2020, 1 month ago

2020-06-12 22:42:00 UTC Orange

Semeru - 20200612/2242Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 2244 UTC (0544 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 southwest.

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11th of June 2020, 1 month ago

2020-06-11 23:28:00 UTC Orange

Semeru - 20200611/2328Z 

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

Eruption with volcanic ash cloud at 2330 UTC (0630 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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2020-06-11 08:32:00 UTC Orange

Dukono - 20200611/0832Z 

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

Eruption with volcanic ash cloud at 0813 UTC (1713 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 southwest.

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10th of June 2020, 1 month ago

2020-06-10 23:23:00 UTC Orange

Semeru - 20200610/2323Z 

Liswanto, A.P., Semeru Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1116 UTC (0616 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 nort.

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2020-06-10 00:23:00 UTC Orange

Dukono - 20200610/0023Z 

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

Eruption with volcanic ash cloud at 2300 UTC (0800 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. Ash-cloud moving to east.

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9th of June 2020, 1 month ago

2020-06-09 23:07:00 UTC Orange

Semeru - 20200609/2307Z 

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

Eruption with volcanic ash cloud at 2255 UTC (0555 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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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.