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
 

21st of June 2020, 3 months ago

2020-06-21 09:16:00 UTC Yellow

Merapi - 20200621/0916Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 3 months ago

Ash-cloud is not visible after eruptions on 0213 and 0227 UTC. Ash-cloud not visible. Ash-cloud is not visible..

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2020-06-21 02:48:00 UTC Red

Merapi - 20200621/0248Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 0213 UTC (0913 local) and 0227 UTC (0927 local) Best estimate of ash-cloud top is around 28698 FT (8968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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10th of April 2020, 5 months ago

2020-04-10 02:16:00 UTC Orange

Merapi - 20200410/0216Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 0910Z (0210 LT). Best estimate of ash-cloud top is around 19098 FT (5968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North-West.

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2nd of April 2020, 5 months ago

2020-04-02 08:21:00 UTC Orange

Merapi - 20200402/0821Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 0810Z (1510 LT). Best estimate of ash-cloud top is around 19098 FT (5968 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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28th of March 2020, 5 months ago

2020-03-28 17:20:00 UTC Orange

Merapi - 20200328/1720Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 1715Z (0015 LT). Best estimate of ash-cloud top is around 14298 FT (4468 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west.

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2020-03-28 12:35:00 UTC Orange

Merapi - 20200328/1235Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 1225Z (1925 LT). Best estimate of ash-cloud top is around 19098 FT (5968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash coud moving to west.

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27th of March 2020, 5 months ago

2020-03-27 22:41:00 UTC Orange

Merapi - 20200327/2241Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 2221Z (0521 LT). Best estimate of ash-cloud top is around 15898 FT (4968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash coud moving to west.

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2020-03-27 14:49:00 UTC Orange

Merapi - 20200327/1449Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 1446 UTC (2146 local). The eruption lasted for 180 seconds Best estimate of ash-cloud top is around 12698 FT (3968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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2020-03-27 11:38:00 UTC Green

Merapi - 20200327/1138Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 5 months ago

No eruption occurred after the last eruption on 27 March 2020 at 03:56 UTC (1056 local) Ash-cloud not visible. Ash-cloud is not visible.

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2020-03-27 04:15:00 UTC Red

Merapi - 20200327/0415Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 0356 UTC (1056 local). The eruption lasted for 420 seconds Best estimate of ash-cloud top is around 25498 FT (7968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.

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3rd of March 2020, 6 months ago

2020-03-03 10:27:00 UTC Green

Merapi - 20200303/1027Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 6 months ago

No eruption occurred after the last eruption on 03 March 2020 at 22:22 UTC (0522 local) Ash-cloud not visible. Volcanic plume not observed due to rain. .

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2nd of March 2020, 6 months ago

2020-03-02 22:50:00 UTC Red

Merapi - 20200302/2250Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 6 months ago

Eruption with volcanic ash cloud at 2222 UTC (0522 local). The eruption lasted for 450 seconds Best estimate of ash-cloud top is around 28698 FT (8968 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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12th of February 2020, 7 months ago

2020-02-12 22:43:00 UTC Orange

Merapi - 20200212/2243Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 7 months ago

Eruption with volcanic ash cloud at 2216 UTC (0516 local). The eruption lasted for 105 seconds Best estimate of ash-cloud top is around 15898 FT (4968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northwest. .

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17th of November 2019, 10 months ago

2019-11-17 03:54:00 UTC Orange

Merapi - 20191117/0354Z 

Yulianto, Merapi Volcano Observatory - 10 months ago

Eruption with ash cloud at 0346 UTC (1046 local), lasted for 155 seconds. Eruption has stopped. Best estimate of ash-cloud top is around 12698 FT (3968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..

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8th of November 2019, 10 months ago

2019-11-08 23:43:00 UTC Orange

Merapi - 20191108/2343Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 10 months ago

Eruption with ash cloud at 2321 UTC (0621 local), lasted for 3 minutes. Eruption has stopped. Best estimate of ash-cloud top is around 14298 FT (4468 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..

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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.