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
 

18th of October 2019, 1 year ago

2019-10-18 06:32:00 UTC Orange

Anak Krakatau - 20191018/0632Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 06:21 UTC (13:21 local ) Best estimate of ash-cloud top is around 0 FT (0 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 white-gray-black thick 200 meters high from the bottom of the crater..

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17th of October 2019, 1 year ago

2019-10-17 04:53:00 UTC Orange

Anak Krakatau - 20191017/0453Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 04:33 UTC (11:33 local ) Best estimate of ash-cloud top is around 3769 FT (1142 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 white-gray thick 200 meters high from the bottom of the crater. .

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16th of October 2019, 1 year ago

2019-10-16 11:18:00 UTC Orange

Anak Krakatau - 20191016/1118Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 09:55 UTC (16:55 local ) Best estimate of ash-cloud top is around 0 FT (0 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 white-black thick 200 meters high from the bottom of the crater. .

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14th of October 2019, 1 year ago

2019-10-14 05:51:00 UTC Orange

Anak Krakatau - 20191014/0551Z 

Hendra Supratman Putra, Rd., Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 05:28 UTC (12:28 local ) Best estimate of ash-cloud top is around 3769 FT (1142 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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13th of October 2019, 1 year ago

2019-10-13 03:44:00 UTC Orange

Anak Krakatau - 20191013/0344Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 03:26UTC (10:26 local) Best estimate of ash-cloud top is around 0 FT (0 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 white-gray-black thick 200 meters high from the bottom of the crater. .

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12th of October 2019, 1 year ago

2019-10-12 05:51:00 UTC Orange

Anak Krakatau - 20191012/0551Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 05:26UTC (12:26 local) Best estimate of ash-cloud top is around 0 FT (0 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 gray-black thick 200 meters high from the bottom of the crater. .

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2019-10-12 03:28:00 UTC Orange

Anak Krakatau - 20191012/0328Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 03:10 UTC (10:10 local) Best estimate of ash-cloud top is around 0 FT (0 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 gray-black thick 200 meters high from the bottom of the crater..

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2nd of October 2019, 1 year ago

2019-10-02 13:33:00 UTC Orange

Anak Krakatau - 20191002/1333Z 

Hendra Supratman Putra, Rd., Anak Krakatau Volcano Observatory - 1 year ago

Hot could avalanches with ash clouds at 13:12 UTC (20:12 local time). The eruption lasted for 15 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau volcano is not clear..

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29th of September 2019, 1 year ago

2019-09-29 05:54:00 UTC Orange

Anak Krakatau - 20190929/0554Z 

Hendra Supratman Putra, Rd., Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 04:42UTC (11:42 local) Best estimate of ash-cloud top is around 2713 FT (822 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 white-gray thick 100 meters high from the bottom of the crater. .

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27th of September 2019, 2 years ago

2019-09-27 08:28:00 UTC Orange

Anak Krakatau - 20190927/0828Z 

Jumono, Anak Krakatau Volcano Observatory - 2 years ago

Recorded eruption at 08:20 UTC (15:20 local) Best estimate of ash-cloud top is around 0 FT (0 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 white-gray thick 200 meters high from the bottom of the crater. .

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26th of September 2019, 2 years ago

2019-09-26 02:08:00 UTC Orange

Anak Krakatau - 20190926/0208Z 

Hendra Supratman Putra, Rd., Anak Krakatau Volcano Observatory - 2 years ago

Recorded eruption at 01:35UTC (08:35 local) Best estimate of ash-cloud top is around 3241 FT (982 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 white-gray thick 150 meters high from the bottom of the crater. .

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25th of September 2019, 2 years ago

2019-09-25 23:02:00 UTC Orange

Anak Krakatau - 20190925/2302Z 

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

Recorded eruption at 22:55 UTC (05:55 local) Best estimate of ash-cloud top is around 0 FT (0 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 gray-black thick 200 meters high from the bottom of the crater. .

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2019-09-25 01:58:00 UTC Orange

Anak Krakatau - 20190925/0158Z 

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

Recorded eruption at 01:13 UTC (08:13 local). Best estimate of ash-cloud top is around 0 FT (0 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 white thick 200 meters high from the bottom of the crater. .

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24th of September 2019, 2 years ago

2019-09-24 01:57:00 UTC Orange

Anak Krakatau - 20190924/0157Z 

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

Recorded eruption at 01:43 UTC (08:43 local) Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north, volcanic ash white-gray thick 200 meters high from the bottom of the crater..

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21st of September 2019, 2 years ago

2019-09-21 09:44:00 UTC Orange

Anak Krakatau - 20190921/0944Z 

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

Eruption with volcanic ash cloud at 2341 UTC (0641 local). Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north, visual cctv crater looks gray-black ash with a height of 200 meters from of the bottom crater..

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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.