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
1st of November 2019, 1 year ago
31st of October 2019, 1 year ago
30th of October 2019, 1 year ago
29th of October 2019, 1 year ago
Observed brownish white ash emission at 23:14 UTC (06:14 local time) Best estimate of ash-cloud top is around 48629 FT (14736 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. ash plume moving to east-southeast-northeast.View
6th of October 2019, 1 year ago
31st of July 2019, 2 years ago
6th of June 2019, 2 years ago
10th of May 2019, 2 years ago
4th of May 2019, 2 years ago
3rd of May 2019, 2 years ago
2nd of May 2019, 2 years ago
Volcanic ash fall has been reported by local resident at 0207 UTC (2107 local time). 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. Thin volcanic ash fall at south and northeast flank about 7 km from the summit..View
13th of April 2019, 2 years 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.