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 November 2020, 2 weeks ago
17th of November 2020, 2 weeks ago
13th of November 2020, 3 weeks ago
12th of November 2020, 3 weeks ago
11th of November 2020, 3 weeks ago
10th of November 2020, 3 weeks ago
Eruption with volcanic ash cloud and pyroclastic flow at 0950 UTC (1650 local) Best estimate of ash-cloud top is around 14272 FT (4460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east southeast and pyroclastic flow to southeast as far as 2500 meters.View
9th of November 2020, 3 weeks ago
6th of November 2020, 4 weeks ago
5th of November 2020, 4 weeks ago
4th of November 2020, 1 month ago
2nd of November 2020, 1 month ago
Eruption with volcanic ash cloud at 16:58 UTC (23:58 local). Eruption and ash emission 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 east.View
1st of November 2020, 1 month ago
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.