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 2021, 3 days ago
Eruption with volcanic ash cloud at 0116UTC (0816 local) Best estimate of ash-cloud top is around 9472 FT (2960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to W - NW .
View7th of April 2021, 6 days ago
Eruption with volcanic ash cloud at 0847UTC (1547 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E - SE.
View6th of April 2021, 1 week ago
Eruption with volcanic ash cloud at 0912 UTC (1812 local) Best estimate of ash-cloud top is around 5520 FT (1725 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..
View5th of April 2021, 1 week ago
Eruption with volcanic ash cloud at 0004UTC (0704 local) Best estimate of ash-cloud top is around 10112 FT (3160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E - SE.
View4th of April 2021, 1 week ago
Eruption with volcanic ash cloud at 0006UTC (0706 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E - SE.
View3rd of April 2021, 1 week ago
Eruption with volcanic ash cloud at 2356UTC (0656 local) Best estimate of ash-cloud top is around 14272 FT (4460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E - SE.
View31st of March 2021, 1 week ago
Eruption with volcanic ash-cloud at 0924 UTC (1824 local). Best estimate of ash-cloud top is around 5200 FT (1625 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to east..
View30th of March 2021, 2 weeks ago
Eruption with volcanic ash cloud at 0335UTC (1035 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E - SE.
View28th of March 2021, 2 weeks ago
Eruption with volcanic ash cloud at 1824UTC (0024 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to N - NE.
View27th of March 2021, 2 weeks ago
Eruption with volcanic ash cloud at 1058 UTC (1758 local). Eruption and ash emission is stopped. Best estimate of ash-cloud top is around 11098 FT (3468 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud generated by pyroclastic density currents (PDC).
View25th of March 2021, 2 weeks ago
Eruption with volcanic ash cloud at 2225 UTC (0725 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 west..
ViewEruption with volcanic ash-cloud at 0914 UTC (1814 local) Best estimate of ash-cloud top is around 7440 FT (2325 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to west.
ViewEruption with volcanic ash cloud at 0030 UTC (0730 local). Best estimate of ash-cloud top is around 14502 FT (4532 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south. .
View23rd of March 2021, 3 weeks ago
Eruption with volcanic ash cloud at 0832 UTC (1532 local) Best estimate of ash-cloud top is around 10112 FT (3160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to W - NW.
View22nd of March 2021, 3 weeks 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.
