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
 

2nd of March 2021, 1 month ago

2021-03-02 00:56:00 UTC Red

Sinabung - 20210302/0056Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Hot could avalanches with ash clouds at 00:52 UTC (07:52 local time). The eruption lasted for 440 seconds Best estimate of ash-cloud top is around 23872 FT (7460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to West - East.

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2021-03-02 00:53:00 UTC Red

Sinabung - 20210302/0053Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Hot could avalanches with ash clouds at 00:48 UTC (07:48 local time). The eruption lasted for 224 seconds Best estimate of ash-cloud top is around 23872 FT (7460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to West - East .

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2021-03-02 00:35:00 UTC Red

Sinabung - 20210302/0035Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Hot could avalanches with ash clouds at 00:33 UTC (07:33 local time). The eruption lasted for 485 seconds Best estimate of ash-cloud top is around 23872 FT (7460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to West - East .

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2021-03-02 00:20:00 UTC Red

Sinabung - 20210302/0020Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Hot could avalanches with ash clouds at 00:15 UTC (07:15 local time). The eruption lasted for 485 seconds Best estimate of ash-cloud top is around 23872 FT (7460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to West - east.

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2021-03-02 00:15:00 UTC Orange

Sinabung - 20210302/0015Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Hot could avalanches with ash clouds at 00:11 UTC (07:11 local time). The eruption lasted for 243 seconds. 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 is moving to West - South.

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2021-03-02 00:05:00 UTC Orange

Sinabung - 20210302/0005Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Hot could avalanches with ash clouds at 00:07 UTC (07:07 local time). The eruption lasted for 272 seconds. 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 is moving to West - South.

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1st of March 2021, 1 month ago

2021-03-01 23:45:00 UTC Orange

Sinabung - 20210301/2345Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Hot could avalanches with ash clouds at 23:42 UTC (06:42 local time). The eruption lasted for 229 seconds. Ash-cloud not visible. Ash cloud is moving to West - Southwest .

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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.