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.
USGS2nd of May 2022, 1 year ago
There is no eruption activity but show an increasing in degassing with plumes height of 500 meters above sea level, at 0054 UTC (0854 local). Best estimate of ash-cloud top is around 3994 FT (1248 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west. .
View29th of April 2022, 1 year ago
There is no eruption activity but show an increasing in degassing at 0538 UTC (1338 local). Best estimate of ash-cloud top is around 3994 FT (1248 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
View28th of April 2022, 1 year ago
The eruption has not yet occurred but an increase in degassing has been observed, at 0817 UTC (1617 local). Best estimate of ash-cloud top is around 6234 FT (1948 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
ViewThe eruption has not yet occurred but an increase in degassing has been observed at 0753 UTC (1453 local). Best estimate of ash-cloud top is around 5594 FT (1748 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
View26th of April 2022, 1 year ago
The eruption has not yet occurred but an increase in degassing has been observed at 2041 UTC (1241 local). Best estimate of ash-cloud top is around 9267 FT (2896 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northeast.
ViewVolcano 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.
