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 August 2020, 3 weeks ago
Eruption with volcanic ash cloud at 0436 UTC (1136 local) Best estimate of ash-cloud top is around 12403 FT (3876 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.
View27th of August 2020, 4 weeks ago
Eruption with volcanic ash cloud at 2321 UTC (0621 local). Best estimate of ash-cloud top is around 13043 FT (4076 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest..
View25th of August 2020, 1 month ago
Eruption with volcanic ash cloud at 06:22 UTC (13:22 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 10432 FT (3260 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west-nortthwest.
ViewEruption with volcanic ash cloud at 03:50 UTC (10:50 local). Eruption and ash emission is continuing. Ash-cloud not visible. Ash-cloud moving to west-nortthwest.
View24th of August 2020, 1 month ago
Eruption with volcanic ash cloud at 2332 UTC (0632 local) Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south.
ViewEruption with volcanic ash cloud at 2322 UTC (0822 local). Best estimate of ash-cloud top is around 6813 FT (2129 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..
View23rd of August 2020, 1 month ago
Eruption with volcanic ash cloud at 2344 UTC (0544 local) Best estimate of ash-cloud top is around 12403 FT (3876 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest..
ViewEruption with volcanic ash cloud at 00:41 UTC (07:41 local). Eruption and ash emission is continuing. 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.
View21st of August 2020, 1 month ago
Eruption with volcanic ash cloud at 2347 UTC (0547 local) Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south. .
View20th of August 2020, 1 month ago
Eruption with volcanic ash cloud at 2330 UTC (0830 local). Best estimate of ash-cloud top is around 6813 FT (2129 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.
ViewEruption with volcanic ash cloud at 2346 UTC (0546 local) Best estimate of ash-cloud top is around 24806 FT (7752 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south..
ViewEruption with volcanic ash cloud at 22:17 UTC (05:17 local). Eruption and ash emission is continuing. Ash-cloud not visible. Ash-cloud moving to east - southeast..
View19th of August 2020, 1 month ago
Eruption with volcanic ash cloud at 11:23 UTC (18:23 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 20672 FT (6460 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.
View17th of August 2020, 1 month ago
Eruption with volcanic ash cloud at 10:24 UTC (17:24 local). Eruption and ash emission is continuing. 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 south-east.
ViewEruption with volcanic ash cloud at 10:24 UTC (17:24 local). Eruption and ash emission is continuing. 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 south-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.
