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
 

15th of January 2020, 1 year ago

2020-01-15 05:01:00 UTC Orange

Anak Krakatau - 20200115/0501Z 

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

Eruption with volcanic ash cloud at 0318 UTC (1018 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 south, volcanic ash black thick 150 meters high from the bottom of the crater. .

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7th of January 2020, 1 year ago

2020-01-07 02:13:00 UTC Orange

Anak Krakatau - 20200107/0213Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 00:36 UTC (07:36 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 east, volcanic ash white-gray thick 200 meters high from the bottom of the crater. .

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1st of January 2020, 1 year ago

2020-01-01 03:52:00 UTC Orange

Anak Krakatau - 20200101/0352Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 0345 UTC (1045 local). Best estimate of ash-cloud top is around 9049 FT (2742 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Thick gray volcanic ash from the top of the crater. Ash cloud is moving to southeast. .

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31st of December 2019, 1 year ago

2019-12-31 06:51:00 UTC Orange

Anak Krakatau - 20191231/0651Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 06:31 UTC (13:31 local ) Best estimate of ash-cloud top is around 12217 FT (3702 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 east.

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2019-12-31 00:05:00 UTC Orange

Anak Krakatau - 20191231/0005Z 

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

Eruption with ash clouds at 23:51 UTC (06:51 local time). Best estimate of ash-cloud top is around 12217 FT (3702 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Thick gray-black volcanic ash from the top of the crater. Ash-cloud moving to south..

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30th of December 2019, 1 year ago

2019-12-30 06:46:00 UTC Orange

Anak Krakatau - 20191230/0646Z 

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

Eruption with ash clouds at 06:35 UTC (13:35 local time). Best estimate of ash-cloud top is around 12217 FT (3702 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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2019-12-30 01:37:00 UTC Orange

Anak Krakatau - 20191230/0137Z 

Oktory Prambada, S.T., M.Sc, Anak Krakatau Volcano Observatory - 1 year 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 22777 FT (6902 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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28th of December 2019, 1 year ago

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

Anak Krakatau - 20191228/2308Z 

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

Recorded eruption at 22:29 UTC (05:29 local ) Best estimate of ash-cloud top is around 2185 FT (662 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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13th of November 2019, 1 year ago

2019-11-13 11:32:00 UTC Orange

Anak Krakatau - 20191113/1132Z 

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

Recorded eruption at 09:50 UTC (16:50 local ) Best estimate of ash-cloud top is around 2185 FT (662 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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7th of November 2019, 1 year ago

2019-11-07 00:54:00 UTC Orange

Anak Krakatau - 20191107/0054Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 00:34 UTC (07:34 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 150 meters high from the bottom of the crater. .

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6th of November 2019, 1 year ago

2019-11-06 06:30:00 UTC Orange

Anak Krakatau - 20191106/0630Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 05:58 UTC (12:58 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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5th of November 2019, 1 year ago

2019-11-05 07:48:00 UTC Orange

Anak Krakatau - 20191105/0748Z 

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

Recorded eruption at 07:39 UTC (14:39 local ) Best estimate of ash-cloud top is around 5881 FT (1782 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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2019-11-05 04:12:00 UTC Orange

Anak Krakatau - 20191105/0412Z 

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

Recorded eruption at 04:04 UTC (11:04 local ) Best estimate of ash-cloud top is around 4825 FT (1462 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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2019-11-05 02:43:00 UTC Orange

Anak Krakatau - 20191105/0243Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 02:36 UTC (09:36 local ) Best estimate of ash-cloud top is around 2185 FT (662 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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29th of October 2019, 1 year ago

2019-10-29 03:58:00 UTC Orange

Anak Krakatau - 20191029/0358Z 

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

Recorded eruption at 03:49 UTC (10:49 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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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.