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.
USGS12th of February 2021, 1 week ago
Eruption with volcanic ash cloud at 2327 UTC (0827 local). Best estimate of ash-cloud top is around 5213 FT (1629 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east..
View10th of February 2021, 2 weeks ago
Eruption with volcanic ash cloud 1047 UTC (1747 Local Time ). Eruption and ash emission is continuing Best estimate of ash-cloud top is around 17062 FT (5332 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east-southeast..
View9th of February 2021, 2 weeks ago
Eruption with volcanic ash cloud 2350 UTC (0650 Local Time ). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 17062 FT (5332 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 1630 UTC (2330 Local Time ). Eruption and ash emission is continuing . Best estimate of ash-cloud top is around 17062 FT (5332 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 0105 UTC (1005 local). Best estimate of ash-cloud top is around 5853 FT (1829 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 0119 UTC (0819 Local Time ). Eruption and ash emission is continuing Best estimate of ash-cloud top is around 18662 FT (5832 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east. .
View8th of February 2021, 2 weeks ago
Eruption with volcanic ash cloud 2250 UTC (0550 Local Time ). Eruption and ash emission is continuing Best estimate of ash-cloud top is around 17062 FT (5332 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 0143 UTC (1043 local) Best estimate of ash-cloud top is around 6800 FT (2125 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..
View7th of February 2021, 2 weeks ago
Eruption with volcanic ash cloud 2245 UTC (0545 Local Time ). Eruption and ash emission is continuing Best estimate of ash-cloud top is around 17062 FT (5332 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east southeast. .
ViewEruption with volcanic ash cloud 1320 UTC (2020 Local Time ). Eruption and ash emission is continuing. 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 east. .
View6th of February 2021, 2 weeks ago
On 7 February 2021, Eruption with volcanic ash cloud 2200 UTC ( 0500 Local Time ). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 13862 FT (4332 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east-southeast.
ViewOn 6 February 2021, Eruption with volcanic ash cloud 1246 UTC ( 19:46 Local Time ). Eruption and ash emission is continuing Best estimate of ash-cloud top is around 12582 FT (3932 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east .
View4th of February 2021, 3 weeks ago
Eruption with volcanic ash-cloud at 2228 UTC (0728 local) Best estimate of ash-cloud top is around 6800 FT (2125 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 2253 UTC (0753 local). Best estimate of ash-cloud top is around 5853 FT (1829 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 February 2021, 3 weeks ago
Eruption with volcanic ash cloud 2310 UTC ( 06:10 Local Time ). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 12262 FT (3832 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to 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.
