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.
USGS29th of July 2018, 3 years ago
Eruption with volcanic ash cloud at 0712 UTC (1612 local). Best estimate of ash-cloud top is around 20328 FT (6160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North..
View28th of July 2018, 3 years ago
Eruption with volcanic ash cloud at 0952 UTC (1852 local). Best estimate of ash-cloud top is around 22440 FT (6800 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to Southeast..
View14th of July 2018, 3 years ago
Eruption with volcanic ash cloud at 0844 UTC (1744 local). Best estimate of ash-cloud top is around 22440 FT (6800 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to East..
View6th of July 2018, 3 years ago
Eruption with volcanic ash cloud at 0943 UTC (1843 local). Best estimate of ash-cloud top is around 20328 FT (6160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North..
View21st of June 2018, 3 years ago
Eruption with volcanic ash cloud at 2357 UTC (0857 local). Best estimate of ash-cloud top is around 20328 FT (6160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..
View12th of June 2018, 3 years ago
Eruption with volcanic ash cloud at 0850 UTC (1750 local). Best estimate of ash-cloud top is around 20328 FT (6160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North..
View6th of June 2018, 3 years ago
Eruption with volcanic ash cloud at 0306 UTC (1206 local). Best estimate of ash-cloud top is around 19272 FT (5840 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..
View4th of May 2018, 3 years ago
Eruption with volcanic ash cloud at 2122 UTC (0622 local). Best estimate of ash-cloud top is around 20328 FT (6160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North..
View1st of May 2018, 3 years ago
Eruption with volcanic ash cloud at 0706 UTC (1606 local). Best estimate of ash-cloud top is around 19272 FT (5840 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to East..
View30th of April 2018, 3 years ago
Eruption produced dark grey volcanic ash cloud at 0922 UTC (1822 local). Best estimate of ash-cloud top is around 19272 FT (5840 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..
View19th of April 2018, 3 years ago
Eruption produced white-grey volcanic ash column at 2137 UTC (0637 local). Best estimate of ash-cloud top is around 20328 FT (6160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..
View28th of August 2017, 4 years ago
Eruption with volcanic ash cloud at 2112 UTC (0612 local). Best estimate of ash-cloud top is around 18216 FT (5520 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North..
View27th of August 2017, 4 years ago
Eruption with volcanic ash cloud at 2337 UTC (0837 local). Best estimate of ash-cloud top is around 17160 FT (5200 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North..
View15th of August 2017, 4 years ago
Eruption produced dark grey volcanic ash cloud at 0116 UTC (1016 local). Best estimate of ash-cloud top is around 19272 FT (5840 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..
View19th of June 2017, 4 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.
