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.
USGS10th of April 2017, 6 years ago
Eruption produced grey volcanic ash cloud at 2354 UTC (0854 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..
View8th of April 2017, 6 years ago
Eruption with volcanic ash cloud at 0910 UTC (1810 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..
View7th of April 2017, 6 years ago
Eruption with ash cloud observed at 2251 UTC (0751 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..
View4th of April 2017, 6 years ago
Eruption with volcanic ash cloud at 0013 UTC (0913 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..
View2nd of April 2017, 6 years ago
Eruption with ash cloud at 2257 UTC (0757 local). Ash emission is continuing. 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 south..
View29th of March 2017, 6 years ago
Eruption with volcanic ash cloud observed at 0058 UTC (0958 local). Eruption and ash emission is continuing. 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 January 2017, 6 years ago
Eruption with ash cloud observed at 2218 UTC (0718 local). Eruption is continuing. 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. White grey ash cloud moving to east..
View19th of October 2019, 3 years ago
Eruption with volcanic ash cloud at 2329 UTC (0829 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 West.
View14th of October 2019, 3 years ago
Eruption with volcanic ash cloud at 2207 UTC (0707 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 south.
View30th of September 2019, 3 years ago
Eruption with volcanic ash cloud at 0906 UTC (1806 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 North.
View4th of September 2019, 4 years ago
Eruption with volcanic ash cloud at 0036 UTC (0936 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. Grey ash-cloud moving to south.
View31st of August 2019, 4 years ago
Eruption with volcanic ash cloud at 0947 UTC (1847 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 North..
View21st of August 2019, 4 years ago
Eruption with volcanic ash cloud at 2204 UTC (07.04 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 west.
View14th of August 2019, 4 years ago
Eruption with volcanic ash cloud at 0207 UTC (1107 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 north.
View14th of May 2019, 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.
