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
 

29th of October 2019, 1 year ago

2019-10-29 02:23:00 UTC Orange

Anak Krakatau - 20191029/0223Z 

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

Recorded eruption at 02:13 UTC (09:13 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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2019-10-29 01:59:00 UTC Orange

Anak Krakatau - 20191029/0159Z 

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

Recorded eruption at 01:44 UTC (08:44 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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27th of October 2019, 1 year ago

2019-10-27 12:48:00 UTC Orange

Anak Krakatau - 20191027/1248Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 12:36 UTC (19:36 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. . Anak Krakatau volcano is not clear..

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26th of October 2019, 1 year ago

2019-10-26 22:58:00 UTC Orange

Anak Krakatau - 20191026/2258Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 22:43 UTC (05:43 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. 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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2019-10-26 18:18:00 UTC Orange

Anak Krakatau - 20191026/1818Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 18:02 UTC (01:02 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. Anak Krakatau volcano is not clear..

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2019-10-26 09:27:00 UTC Orange

Anak Krakatau - 20191026/0927Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 09:09 UTC (16:09 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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2019-10-26 01:27:00 UTC Orange

Anak Krakatau - 20191026/0127Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 01:02 UTC (08:02 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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25th of October 2019, 1 year ago

2019-10-25 21:29:00 UTC Orange

Anak Krakatau - 20191025/2129Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 21:23 UTC (04:23 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. Anak Krakatau volcano is not clear..

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2019-10-25 20:56:00 UTC Orange

Anak Krakatau - 20191025/2056Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 20:40 UTC (03:40 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. Anak Krakatau volcano is not clear..

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2019-10-25 01:39:00 UTC Orange

Anak Krakatau - 20191025/0139Z 

Jumono, Anak Krakatau Volcano Observatory - 1 year ago

Recorded eruption at 00:29 UTC (07:29 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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20th of October 2019, 1 year ago

2019-10-20 09:40:00 UTC Orange

Anak Krakatau - 20191020/0940Z 

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

Recorded eruption at 09:17 UTC (16:17 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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2019-10-20 00:23:00 UTC Orange

Anak Krakatau - 20191020/0023Z 

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

Recorded eruption at 00:05 UTC (07:05 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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19th of October 2019, 1 year ago

2019-10-19 23:33:00 UTC Orange

Anak Krakatau - 20191019/2333Z 

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

Recorded eruption at 22:41 UTC (05:41 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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2019-10-19 13:18:00 UTC Orange

Anak Krakatau - 20191019/1318Z 

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

Recorded eruption at 12:59 UTC (19:59 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. Anak Krakatau volcano is not clear..

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2019-10-19 11:47:00 UTC Orange

Anak Krakatau - 20191019/1147Z 

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

Recorded eruption at 10:10 UTC (17:10 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.