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.
USGS21st of December 2016, 5 years ago
Eruption with volcanic ash clouds at 16:44 UTC (23:44 local time). The eruption lasted for 180 second. Best estimate of ash-cloud top is around 41818 FT (12672 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to southeast-East.
ViewEruption with volcanic ash clouds at 08:44 UTC (15:44 local time). The eruption lasted for 308 second. Best estimate of ash-cloud top is around 52378 FT (15872 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to southwest.
ViewEruption with volcanic ash cloud at 0944 UTC (1544 local). Best estimate of ash-cloud top is around 52378 FT (15872 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 clouds at 01:02 UTC (08:02 local time). The eruption lasted for 224 second. Best estimate of ash-cloud top is around 36538 FT (11072 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to southeast.
ViewEruption with volcanic ash cloud at 0102 UTC (0802 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 36538 FT (11072 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. ash cloud moving to the southeast.
ViewEruption observed at 2308 UTC (0808 local) produced dark-grey ash cloud. Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east-northeast..
View20th of December 2016, 5 years ago
Eruption with volcanic ash cloud at 1709 UTC (0009 local time). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 36538 FT (11072 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 clouds at 17:09 UTC (00:09 local time). The eruption lasted for 216 second Best estimate of ash-cloud top is around 36538 FT (11072 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to southeast.
View19th of December 2016, 5 years ago
Eruption produced dark-grey ash cloud observed at 2253 UTC (0753 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 20371 FT (6173 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 at 1151 UTC (1751 local time) 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 couldnot observed.
ViewEruption with volcanic ash clouds at 01:24 UTC (08:24 local time). The eruption lasted for 193 seconds. Best estimate of ash-cloud top is around 36538 FT (11072 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to south.
ViewEruption at 1440 UTC (2140 Localtime). 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 obeserved.
View18th of December 2016, 5 years ago
Eruption with ash cloud observed at 2305 UTC (0805 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 23539 FT (7133 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 at 1922 UTC (0222 Localtime) 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 observed caused local weather.
ViewEruption produced dark-grey ash cloud observed at 2356 UTC (0856 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 23539 FT (7133 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southeast..
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.
