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
 

10th of December 2018, 2 years ago

2018-12-10 02:24:00 UTC Orange

Anak Krakatau - 20181210/0224Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 03:50 UTC (10:50 local time). The eruption lasted for 329 seconds. Best estimate of ash-cloud top is around 10963 FT (3322 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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4th of December 2018, 2 years ago

2018-12-04 04:15:00 UTC Orange

Anak Krakatau - 20181204/0415Z 

Windi Cahya Untung, Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 03.51 UTC (10.51 local time). The eruption lasted for 172 seconds. Best estimate of ash-cloud top is around 9907 FT (3002 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to north.

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2018-12-04 03:15:00 UTC Orange

Anak Krakatau - 20181204/0315Z 

Windi Cahya Untung, Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 02.49 UTC (09.49 local time). The eruption lasted for 169 seconds. Best estimate of ash-cloud top is around 8851 FT (2682 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to north.

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3rd of December 2018, 2 years ago

2018-12-03 02:17:00 UTC Orange

Anak Krakatau - 20181203/0217Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 01.16 UTC (08.16 local time). The eruption lasted for 69 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 10963 FT (3322 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 December 2018, 2 years ago

2018-12-02 09:18:00 UTC Orange

Anak Krakatau - 20181202/0918Z 

Windi Cahya Untung, Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 07.08 UTC (14.08 local time). The eruption lasted for 46 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 9907 FT (3002 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to northeast.

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26th of November 2018, 2 years ago

2018-11-26 03:44:00 UTC Orange

Anak Krakatau - 20181126/0344Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 03.37 UTC (10.37 local time). The eruption lasted for 36 seconds. Best estimate of ash-cloud top is around 9907 FT (3002 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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2018-11-26 02:08:00 UTC Orange

Anak Krakatau - 20181126/0208Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 02.00 UTC (09.00 local time). The eruption lasted for 30 seconds. Best estimate of ash-cloud top is around 7795 FT (2362 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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25th of November 2018, 2 years ago

2018-11-25 01:48:00 UTC Orange

Anak Krakatau - 20181125/0148Z 

Jumono, Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 01.10 UTC (08.10 local time). The eruption lasted for 42 seconds.. Best estimate of ash-cloud top is around 6739 FT (2042 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to southwest.

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23rd of November 2018, 2 years ago

2018-11-23 23:28:00 UTC Orange

Anak Krakatau - 20181123/2328Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 23:11 UTC (06:11 local time). The eruption lasted for 33 seconds. Best estimate of ash-cloud top is around 6739 FT (2042 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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16th of November 2018, 2 years ago

2018-11-16 00:59:00 UTC Orange

Anak Krakatau - 20181116/0059Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 22:32 UTC (05:32 local time). The eruption lasted for 207 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6739 FT (2042 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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2018-11-16 00:51:00 UTC Orange

Anak Krakatau - 20181116/0051Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 22:24 UTC (05:24 local time). The eruption lasted for 212 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 9907 FT (3002 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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14th of November 2018, 2 years ago

2018-11-14 23:19:00 UTC Orange

Anak Krakatau - 20181114/2319Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 23:01 UTC (06:01 local time). The eruption lasted for 44 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 8851 FT (2682 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east-northeast..

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2018-11-14 11:23:00 UTC Orange

Anak Krakatau - 20181114/1123Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 11:08 UTC (18:08 local time). The eruption lasted for 33 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 10963 FT (3322 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east-northeast..

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2018-11-14 10:18:00 UTC Orange

Anak Krakatau - 20181114/1018Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 10:08 UTC (17:08 local time). The eruption lasted for 71 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 10963 FT (3322 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east-northeast..

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2018-11-14 05:44:00 UTC Orange

Anak Krakatau - 20181114/0544Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 05:39 UTC (12:39 local time). The eruption lasted for 72 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6739 FT (2042 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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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.