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.
USGS14th of May 2021, 1 year ago
Eruption with volcanic ash cloud at 2128 UTC (0628 local). Best estimate of ash-cloud top is around 6493 FT (2029 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southeast..
View13th of May 2021, 1 year ago
Eruption with volcanic ash cloud at 0904 UTC (1804 local). Best estimate of ash-cloud top is around 5853 FT (1829 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..
View12th of May 2021, 1 year ago
Eruption with volcanic ash cloud at 2208 UTC (0708 local). Best estimate of ash-cloud top is around 6173 FT (1929 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.
View3rd of May 2021, 1 year ago
Eruption with volcanic ash cloud at 2120 UTC (0620 local). Best estimate of ash-cloud top is around 5853 FT (1829 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.
View1st of May 2021, 1 year ago
Eruption with volcanic ash cloud at 2337 UTC (0837 local). Best estimate of ash-cloud top is around 5533 FT (1729 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
View12th of February 2021, 1 year ago
Eruption with volcanic ash cloud at 2314 UTC (0814 local). Best estimate of ash-cloud top is around 16147 FT (4893 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east.
ViewEruption with volcanic ash cloud at 2327 UTC (0827 local). Best estimate of ash-cloud top is around 17203 FT (5213 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east..
View9th of February 2021, 1 year ago
Eruption with volcanic ash cloud at 0105 UTC (1005 local). Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east..
View4th of February 2021, 1 year ago
Eruption with volcanic ash cloud at 2253 UTC (0753 local). Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest..
View3rd of February 2021, 1 year ago
Eruption with volcanic ash cloud at 0058 UTC (0958 local). Best estimate of ash-cloud top is around 15091 FT (4573 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south..
View27th of January 2021, 1 year ago
Eruption with volcanic ash cloud at 0516 UTC (1416 local). Best estimate of ash-cloud top is around 15091 FT (4573 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 January 2021, 1 year ago
Eruption with volcanic ash cloud at 0349 UTC (1249 local). Best estimate of ash-cloud top is around 14035 FT (4253 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south..
View25th of January 2021, 1 year ago
Eruption with volcanic ash cloud at 2323 UTC (0823 local). Best estimate of ash-cloud top is around 16147 FT (4893 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south..
View12th of January 2021, 1 year ago
Eruption with volcanic ash cloud at 2331 UTC (0831 local). Best estimate of ash-cloud top is around 20371 FT (6173 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
View10th of January 2021, 1 year 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.
