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
 

15th of April 2020, 5 months ago

2020-04-15 06:29:00 UTC Yellow

Lokon - 20200415/0629Z 

Syegi Lenarahmi Kunrat, S.Si., M.Sc., Lokon Volcano Observatory - 5 months ago

An increased in volcanic earthquakes in the past view days has been observed indicating an increased likelihood of an eruption Ash-cloud not visible. ash-cloud has not been observed.

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14th of May 2017, 3 years ago

2017-05-14 07:34:00 UTC Yellow

Lokon - 20170514/0734Z 

Martanto, S.T., Lokon Volcano Observatory - 3 years ago

There is an increasing volcanic activity. Visual observation does not show any sign of eruption. 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. Visual observation does not show any sign of eruption..

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29th of September 2016, 3 years ago

2016-09-29 07:35:00 UTC Yellow

Lokon - 20160929/0735Z 

Martanto, S.T., Lokon Volcano Observatory - 3 years ago

Lokon Volcano Observatory has detected an increase in volcanic activity at Lokon Volcano, Tomohon, North Sulawesi province. This increase is observed in the past 24 hours. Therefore, the Aviation Color Code is set to YELLOW. There is no indication that an eruption is imminent or certain, however the potential for an eruption is increased. Lokon Volcano Observatory will continue to monitor the volcano closely. 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. NILL.

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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.