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 April 2021, 2 weeks ago

2021-04-18 23:47:00 UTC Orange

Semeru - 20210418/2347Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 2350 UTC (0650 local). Best estimate of ash-cloud top is around 13043 FT (4076 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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2021-04-18 02:26:00 UTC Orange

Sinabung - 20210418/0226Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0226 UTC (0926 local) Best estimate of ash-cloud top is around 9472 FT (2960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to W-SW.

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17th of April 2021, 2 weeks ago

2021-04-17 10:32:00 UTC Orange

Sinabung - 20210417/1032Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 01031 UTC (1731 local) Best estimate of ash-cloud top is around 9472 FT (2960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to S..

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2021-04-17 07:50:00 UTC Orange

Sinabung - 20210417/0750Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0754 UTC (1454 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to S. .

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2021-04-17 07:46:00 UTC Orange

Sinabung - 20210417/0746Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0750 UTC (1450 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to S. .

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2021-04-17 07:43:00 UTC Orange

Sinabung - 20210417/0743Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0744 UTC (1444 local) Best estimate of ash-cloud top is around 12672 FT (3960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to S. .

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2021-04-17 03:32:00 UTC Orange

Sinabung - 20210417/0332Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0335 UTC (1035 local) Best estimate of ash-cloud top is around 10112 FT (3160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to S..

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16th of April 2021, 2 weeks ago

2021-04-16 23:15:00 UTC Orange

Sinabung - 20210416/2315Z 

Armen Putra, Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 22:49 UTC (05:49 local) Best estimate of ash-cloud top is around 12672 FT (3960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to SW - W.

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2021-04-16 01:56:00 UTC Orange

Sinabung - 20210416/0156Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0157 UTC (0857 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to S - W.

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15th of April 2021, 3 weeks ago

2021-04-15 02:18:00 UTC Orange

Sinabung - 20210415/0218Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0215 UTC (0915 local) Best estimate of ash-cloud top is around 12672 FT (3960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to W -NW .

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13th of April 2021, 3 weeks ago

2021-04-13 23:50:00 UTC Orange

Sinabung - 20210413/2350Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2344 UTC (0644 local) Best estimate of ash-cloud top is around 9472 FT (2960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E - NE.

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2021-04-13 10:26:00 UTC Orange

Sinabung - 20210413/1026Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 1029UTC (1729 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to NE .

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2021-04-13 07:00:00 UTC Orange

Sinabung - 20210413/0700Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0702UTC (1402 local) Best estimate of ash-cloud top is around 12992 FT (4060 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to NE .

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2021-04-13 06:13:00 UTC Orange

Sinabung - 20210413/0613Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0611UTC (1311 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E - SE .

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10th of April 2021, 3 weeks ago

2021-04-10 01:16:00 UTC Orange

Sinabung - 20210410/0116Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0116UTC (0816 local) Best estimate of ash-cloud top is around 9472 FT (2960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to W - NW .

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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.