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.
USGS23rd of October 2018, 4 years ago
Eruption with volcanic ash cloud at 0208 UTC (1008 local). Best estimate of ash-cloud top is around 16147 FT (4893 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..
View22nd of October 2018, 4 years ago
Eruption with volcanic ash cloud at 0909 UTC (1809 local). Best estimate of ash-cloud top is around 18216 FT (5520 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to North..
View19th of October 2018, 4 years ago
Eruption with volcanic ash cloud at 0323 UTC (1223 local). Best estimate of ash-cloud top is around 18216 FT (5520 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 0111 UTC (1011 local). 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..
View18th of October 2018, 4 years ago
Eruption with volcanic ash cloud at 0252 UTC (1152 local). Best estimate of ash-cloud top is around 18259 FT (5533 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 0000 UTC (0900 local). Best estimate of ash-cloud top is around 16147 FT (4893 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to East..
View16th of October 2018, 4 years ago
No sign of volcanic ash. White smoke observed. 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. No volcanic ash observed..
ViewEruption with volcanic ash cloud at 0906 UTC (1806 local). Best estimate of ash-cloud top is around 15091 FT (4573 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..
View15th of October 2018, 4 years ago
Ash Emission with volcanic ash cloud at 0538 UTC (1338 local) and is continuing Best estimate of ash-cloud top is around 23222 FT (7037 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west - northwest-southwest.
View13th of October 2018, 4 years ago
Eruption with volcanic ash cloud at 2228 UTC (0728 local). 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 west..
View10th of October 2018, 4 years ago
Gas emission observed at 0852 UTC (1752 local). No sign of volcanic ash. Best estimate of ash-cloud top is around 18216 FT (5520 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Gas emitted continuously, mostly contain water vapour..
View8th of October 2018, 4 years ago
Eruption with volcanic ash cloud at 0840 UTC (1740 local). 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 west..
ViewEruption with volcanic ash cloud at 0325 UTC (1225 local). 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 west..
View7th of October 2018, 4 years ago
Eruption with volcanic ash cloud at 2217 UTC (0719 local). 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 West..
View5th of October 2018, 4 years ago
Volcano 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.
