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 December 2019, 1 month ago

2019-12-30 01:37:00 UTC Orange

Anak Krakatau - 20191230/0137Z 

Oktory Prambada, S.T., M.Sc, Anak Krakatau Volcano Observatory - 1 month ago

Tremor recorded on seismogram with maximum amplitude 55 mm and still recorded continuously. Gas emission and small eruption seen continuously Best estimate of ash-cloud top is around 6902 FT (2157 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White grey ash cloud is moving to South.

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29th of December 2019, 1 month ago

2019-12-29 06:53:00 UTC Orange

Dukono - 20191229/0653Z 

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

Eruption with volcanic ash cloud at 0549 UTC ( 1449 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. -cloud moving to southwest..

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28th of December 2019, 1 month ago

2019-12-28 23:08:00 UTC Orange

Anak Krakatau - 20191228/2308Z 

Arif Cahyo Purnomo, A.Md., Anak Krakatau Volcano Observatory - 1 month ago

Recorded eruption at 22:29 UTC (05:29 local ) Best estimate of ash-cloud top is around 662 FT (207 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. visually from cctv crater seen volcanic ash moving to north, volcanic ash black-gray thick 200 meters high from the bottom of the crater. .

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25th of December 2019, 2 months ago

2019-12-25 00:12:00 UTC Orange

Dukono - 20191225/0012Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0005 UTC 0905 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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18th of December 2019, 2 months ago

2019-12-18 01:02:00 UTC Orange

Dukono - 20191218/0102Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2342 UTC ( 0842 local). Best estimate of ash-cloud top is around 6173 FT (1929 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 December 2019, 2 months ago

2019-12-17 00:55:00 UTC Orange

Dukono - 20191217/0055Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0035 UTC (0910 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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15th of December 2019, 2 months ago

2019-12-15 22:28:00 UTC Orange

Dukono - 20191215/2228Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2128 UTC (0628 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 west..

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2019-12-15 01:05:00 UTC Orange

Dukono - 20191215/0105Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2356 UTC (0856 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 south.

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12th of December 2019, 2 months ago

2019-12-12 23:33:00 UTC Orange

Dukono - 20191212/2333Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2325 UTC ( 0825 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 southeast.

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7th of December 2019, 2 months ago

2019-12-07 00:04:00 UTC Orange

Dukono - 20191207/0004Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2341 UTC (0841 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 southeast..

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6th of December 2019, 2 months ago

2019-12-06 01:19:00 UTC Orange

Dukono - 20191206/0119Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0020 UTC (0920 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 south..

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4th of December 2019, 2 months ago

2019-12-04 23:24:00 UTC Orange

Dukono - 20191204/2324Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2154 UTC (0654 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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2019-12-04 01:22:00 UTC Orange

Dukono - 20191204/0122Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2253 UTC (0753 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 south.

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3rd of December 2019, 2 months ago

2019-12-03 01:41:00 UTC Orange

Dukono - 20191203/0141Z 

Pretina Sitinjak, S.T., Dukono Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2353 UTC (0853 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 east..

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2019-12-03 01:31:00 UTC Orange

Ibu - 20191203/0131Z 

Pretina Sitinjak, S.T., Ibu Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0008 UTC (0908 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. 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.