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.
USGS7th of February 2019, 4 years ago
Eruption with volcanic ash cloud at 1612 UTC (0012 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 cannot be observed.
View22nd of January 2019, 4 years ago
Eruption with volcanic ash cloud at 1918 UTC (0318 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 cannot be observed.
View21st of January 2019, 4 years ago
Eruption with volcanic ash cloud at 1942 UTC (0342 local) Best estimate of ash-cloud top is around 54298 FT (16454 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southeast.
ViewEruption with volcanic ash cloud at 0845 UTC (1645 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 cannot be observed.
View18th of January 2019, 4 years ago
Eruption with volcanic ash cloud at 1845 UTC (0245 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 cannot be observed.
View10th of January 2019, 4 years ago
Eruption with volcanic ash cloud at 1155 UTC (1955 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 cannot be observed..
View27th of July 2018, 5 years ago
Eruption with emising gas ash cloud at 0606 UTC (1406Local), Eruption is not continue Best estimate of ash-cloud top is around 54298 FT (16454 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving to west.
View24th of July 2018, 5 years ago
Eruption with volcanic ash cloud at 0452 UTC (1252 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 49018 FT (14854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south east.
View21st of July 2018, 5 years ago
Eruption with volcanic ash cloud at 0349 UTC (1149 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 49018 FT (14854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west .
View15th of July 2018, 5 years ago
Eruption with volcanic ash cloud at 0105 UTC (0905 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 49018 FT (14854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west - southeast.
View14th of July 2018, 5 years ago
Eruption with volcanic ash cloud at 2052 UTC (0452 local). Eruption and ash emission is not continuing 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. _.
View13th of July 2018, 5 years ago
Eruption with volcanic ash cloud at 0609 UTC (1409 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 49018 FT (14854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..
View9th of July 2018, 5 years ago
Eruption with volcanic ash cloud at 0320 UTC (1120 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 54298 FT (16454 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..
View8th of July 2018, 5 years ago
Eruption with volcanic ash cloud at 0759 UTC (1559 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 49018 FT (14854 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 0200 UTC (1000 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 38458 FT (11654 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..
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.
