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

27th of October 2022, 3 months ago


Sorikmarapi - 20221027/1101Z Exercise

Oktory Prambada, S.T., M.Sc, 3 months ago

Ash-cloud is not observed. Ash-cloud is not observed.

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Sorikmarapi - 20221027/1011Z Exercise

Oktory Prambada, S.T., M.Sc, 3 months ago

Increasing in volcanic activity. Ash-cloud is not observed.

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Sorikmarapi - 20221027/0355Z Exercise

Oktory Prambada, S.T., M.Sc, 3 months ago

Eruption at 0355 UTC (1055 local). Ash-cloud is not observed.

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Sorikmarapi - 20221027/0200Z Exercise

Oktory Prambada, S.T., M.Sc, 3 months ago

Eruption with volcanic ash cloud at 0200 UTC (0900 local). Best estimate of ash-cloud top is around 46864 FT (14645 M) above sea level or 40000 FT (12500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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26th of October 2022, 3 months ago


Sorikmarapi - 20221026/1311Z Exercise

Martanto, S.T., 3 months ago

Ash-cloud is not observed. Ash-cloud is not observed.

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Sorikmarapi - 20221026/0200Z Exercise

Oktory Prambada, S.T., M.Sc, 3 months ago

Eruption with volcanic ash cloud at 0200 UTC (0900 local). Best estimate of ash-cloud top is around 46864 FT (14645 M) above sea level or 40000 FT (12500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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VONA Color Code
Green

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.


Yellow

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.


Orange

Volcano is exhibiting heightened unrest with increased likelihood of eruption with column height below 6000 meter above sea level.


Red

Eruption is forecast to be imminent with significant emission of ash with column height above 6000 meter above sea level.

Archived

Old Vona