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.
USGS12th of June 2017, 5 years ago
Eruption with volcanic ash cloud at 2345 UTC (0845 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 West..
View11th of June 2017, 5 years ago
Eruption with volcanic ash cloud at 2340 UTC (0840 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 South..
View10th of June 2017, 5 years ago
Eruption with volcanic ash cloud at 2332 UTC (0832 local). Best estimate of ash-cloud top is around 17688 FT (5360 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..
View9th of June 2017, 5 years ago
Eruption with volcanic ash cloud at 2359 UTC (0859 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..
View5th of June 2017, 5 years ago
Eruption with volcanic ash at 2358 UTC (0858 local). Best estimate of ash-cloud top is around 15576 FT (4720 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southeast..
View1st of June 2017, 5 years ago
Eruption with volcanic ash cloud at 2259 UTC (0759 local). Best estimate of ash-cloud top is around 16632 FT (5040 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North..
View26th of May 2017, 5 years ago
Eruption with volcanic ash cloud at 0151 UTC (1051 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 southeast..
View22nd of May 2017, 5 years ago
Eruption with volcanic ash cloud at 2236 UTC (0736 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 south..
View20th of May 2017, 5 years ago
Eruption with volcanic ash cloud at 0312 UTC (1212 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..
View18th of May 2017, 5 years ago
Eruption with volcanic ash cloud at 2313 UTC (0813 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..
View16th of May 2017, 5 years ago
Eruption with volcanic ash cloud at 0038 UTC (0938 local). Best estimate of ash-cloud top is around 16632 FT (5040 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..
View10th of May 2017, 5 years ago
Eruption with volcanic ash cloud at 2252 UTC (0752 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 Southeast..
ViewEruption with volcanic ash cloud at 0914 UTC (1814 local). Best estimate of ash-cloud top is around 18744 FT (5680 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..
View1st of May 2017, 5 years ago
Eruption with volcanic ash cloud at 2328 UTC (0828 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 southwest..
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.
