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.
USGS28th of July 2021, 1 year ago
Eruption with ash clouds at 06:20 UTC (13:20 local time). The eruption lasted for 742 seconds. Best estimate of ash-cloud top is around 22272 FT (6960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to E - S..
View19th of July 2021, 1 year ago
Eruption with ash clouds at 02:25 UTC (18:50 local time). The eruption lasted for 662 seconds. 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..
View13th of July 2021, 1 year ago
Eruption with ash clouds at 02:25 UTC (09:25 local time). The eruption lasted for 463 seconds. 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 E-SE..
View4th of July 2021, 1 year ago
Eruption with ash clouds at 15:15 UTC (22:15 local time). The eruption lasted for 95 seconds. Ash-cloud not visible. The ashes are not observed because of closed fog.
View6th of June 2021, 1 year ago
Eruption with ash clouds at 16:35 UTC (23:35 local time). The eruption lasted for 421 seconds. Ash-cloud not visible. The ashes are not observed because of closed fog.
View3rd of June 2021, 1 year ago
Eruption with ash clouds at 13:04 UTC (20:04 local time). The eruption lasted for 86 seconds. Ash-cloud not visible. The ashes are not observed because of closed fog.
View12th of May 2021, 1 year ago
Eruption with volcanic ash cloud at 2245 UTC (0545 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 east. .
View11th of May 2021, 1 year ago
Eruption with volcanic ash cloud at 0728 UTC (1428 local). Best estimate of ash-cloud top is around 12672 FT (3960 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 0012 UTC (0712 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 west..
View10th of May 2021, 1 year ago
Eruption with volcanic ash cloud at 0047 UTC (0747 local). Best estimate of ash-cloud top is around 15872 FT (4960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south - west..
View8th of May 2021, 1 year ago
Eruption with volcanic ash cloud at 1141 UTC (1841 local). Best estimate of ash-cloud top is around 15872 FT (4960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east - west. .
ViewEruption with volcanic ash cloud at 0956 UTC (1656 local). Best estimate of ash-cloud top is around 16832 FT (5260 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E..
ViewEruption with volcanic ash cloud at 0344 UTC (1044 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 west-northwest.
View7th of May 2021, 1 year ago
Eruption with volcanic ash cloud at 0819 UTC (1519 local). Best estimate of ash-cloud top is around 17472 FT (5460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving east.
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.
