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 June 2021, 1 month ago
Eruption with volcanic ash cloud at 0432 UTC (1132 local). The eruption has 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 PDC moving to the west. .
View24th of June 2021, 1 month ago
Eruption with volcanic ash cloud at 2144 UTC (0444 local). Eruption has stopped. Best estimate of ash-cloud top is around 12698 FT (3968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Wind direction to southeast. .
View9th of January 2021, 6 months ago
Pyroclastic density current with ash cloud at 0145 UTC (0845 local). Eruption has stopped. Best estimate of ash-cloud top is around 33455 FT (10138 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Pyroclastic density current heading northwest..
View7th of January 2021, 6 months ago
Eruption with pyroclastic density current at 0102 UTC (0802 local). Eruption has stopped. Best estimate of ash-cloud top is around 33455 FT (10138 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Pyroclastic density current heading southwest..
View21st of June 2020, 1 year ago
Ash-cloud is not visible after eruptions on 0213 and 0227 UTC. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is not visible..
ViewEruption with volcanic ash cloud at 0213 UTC (0913 local) and 0227 UTC (0927 local) Best estimate of ash-cloud top is around 94703 FT (28698 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
View10th of April 2020, 1 year ago
Eruption with volcanic ash cloud at 0910Z (0210 LT). Best estimate of ash-cloud top is around 63023 FT (19098 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North-West.
View2nd of April 2020, 1 year ago
Eruption with volcanic ash cloud at 0810Z (1510 LT). Best estimate of ash-cloud top is around 63023 FT (19098 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to East. .
View28th of March 2020, 1 year ago
Eruption with volcanic ash cloud at 1715Z (0015 LT). Best estimate of ash-cloud top is around 47183 FT (14298 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 1225Z (1925 LT). Best estimate of ash-cloud top is around 63023 FT (19098 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash coud moving to west.
View27th of March 2020, 1 year ago
Eruption with volcanic ash cloud at 2221Z (0521 LT). Best estimate of ash-cloud top is around 52463 FT (15898 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash coud moving to west.
ViewEruption with volcanic ash cloud at 1446 UTC (2146 local). The eruption lasted for 180 seconds Best estimate of ash-cloud top is around 41903 FT (12698 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
ViewNo eruption occurred after the last eruption on 27 March 2020 at 03:56 UTC (1056 local) Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is not visible.
ViewEruption with volcanic ash cloud at 0356 UTC (1056 local). The eruption lasted for 420 seconds Best estimate of ash-cloud top is around 84143 FT (25498 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 March 2020, 1 year ago
No eruption occurred after the last eruption on 03 March 2020 at 22:22 UTC (0522 local) Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Volcanic plume not observed due to rain. .
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.
