Archived
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
 

6th of August 2018, 4 years ago

2018-08-06 09:46:00 UTC Orange

Dukono - 20180806/0946Z

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

Eruption with volcanic ash cloud at 0939 UTC (1839 local). Best estimate of ash-cloud top is around 21427 FT (6493 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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2018-08-06 00:39:00 UTC Orange

Dukono - 20180806/0039Z

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

Eruption and volcanic ash cloud at 0013 UTC (0913 local). Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north-northeast..

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5th of August 2018, 4 years ago

2018-08-05 02:04:00 UTC Orange

Dukono - 20180805/0204Z

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

Eruption with volcanic ash cloud at 0158 UTC (1058 local). Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North - Northeast..

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3rd of August 2018, 4 years ago

2018-08-03 09:49:00 UTC Orange

Dukono - 20180803/0949Z

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

Eruption with volcanic ash cloud at 0943 UTC (1843 local). Best estimate of ash-cloud top is around 18259 FT (5533 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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2018-08-03 01:57:00 UTC Orange

Dukono - 20180803/0157Z

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

Eruption with volcanic ash cloud at 0112 UTC (1012 local). Ash fall at observatory post, about 11 Km north side of the crater. Best estimate of ash-cloud top is around 17203 FT (5213 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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2nd of August 2018, 4 years ago

2018-08-02 09:06:00 UTC Orange

Anak Krakatau - 20180802/0906Z

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 4 years ago

Eruption with ash clouds at 09:00 UTC (16:00 local time). The eruption lasted for 19 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 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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2018-08-02 09:00:00 UTC Orange

Anak Krakatau - 20180802/0900Z

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 4 years ago

Eruption with ash clouds at 08:56 UTC (15:56 local time). The eruption lasted for 19 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 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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2018-08-02 08:59:00 UTC Orange

Anak Krakatau - 20180802/0859Z

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 4 years ago

Eruption with ash clouds at 08:54 UTC (15:54 local time). The eruption lasted for 20 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 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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2018-08-02 08:58:00 UTC Orange

Anak Krakatau - 20180802/0858Z

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 4 years ago

Eruption with ash clouds at 08:51 UTC (15:51 local time). The eruption lasted for 26 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 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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2018-08-02 08:54:00 UTC Orange

Anak Krakatau - 20180802/0854Z

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 4 years ago

Eruption with ash clouds at 08:43 UTC (15:43 local time). The eruption lasted for 19 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 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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2018-08-02 08:53:00 UTC Orange

Anak Krakatau - 20180802/0853Z

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 4 years ago

Eruption with ash clouds at 08:42 UTC (15:42 local time). The eruption lasted for 13 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 5333 FT (1616 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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2018-08-02 08:48:00 UTC Orange

Anak Krakatau - 20180802/0848Z

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 4 years ago

Eruption with ash clouds at 07:54 UTC (14:54 local time). The eruption lasted for 64 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6389 FT (1936 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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2018-08-02 08:41:00 UTC Orange

Anak Krakatau - 20180802/0841Z

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 4 years ago

Eruption with ash clouds at 07:00 UTC (14:00 local time). The eruption lasted for 37 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6389 FT (1936 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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2018-08-02 06:48:00 UTC Orange

Anak Krakatau - 20180802/0648Z

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 4 years ago

Eruption with ash clouds at 06:33 UTC (13:33 local time). The eruption lasted for 43 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6389 FT (1936 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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31st of July 2018, 4 years ago

2018-07-31 22:58:00 UTC Orange

Dukono - 20180731/2258Z

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

Eruption with volcanic ash cloud at 2205 UTC (0705 local). Best estimate of ash-cloud top is around 20371 FT (6173 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North-Northwest..

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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.