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.
USGS1st of May 2017, 5 years ago
Eruption with volcanic ash cloud at 0707 UTC (1607 local). Best estimate of ash-cloud top is around 17160 FT (5200 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast..
View30th of April 2017, 5 years ago
Eruption with volcanic ash cloud at 0309 UTC (1209 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..
View28th of April 2017, 5 years ago
Eruption with volcanic ash cloud at 2330 UTC (0830 local). Best estimate of ash-cloud top is around 16632 FT (5040 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..
View26th of April 2017, 5 years ago
Eruption with volcanic ash cloud at 2158 UTC (0758 local). Best estimate of ash-cloud top is around 18744 FT (5680 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..
ViewEruption with volcanic ash cloud at 0017 UTC (0917 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast..
View21st of April 2017, 5 years ago
Eruption produced white-grey volcanic ash cloud at 2347 UTC (0847 local). Best estimate of ash-cloud top is around 15576 FT (4720 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..
View20th of April 2017, 5 years ago
Eruption with volcanic ash cloud at 2323 UTC (0823 local). Best estimate of ash-cloud top is around 19272 FT (5840 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Dark-grey volcanic ash cloud moving to east..
View19th of April 2017, 5 years ago
Eruption with volcanic ash cloud at 0857 UTC (1757 local). Best estimate of ash-cloud top is around 19272 FT (5840 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..
View18th of April 2017, 5 years ago
Eruption with volcanic ash cloud at 2310 UTC (0810 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east..
View17th of April 2017, 5 years ago
Eruption with volcanic ash cloud at 0054 UTC (0954 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..
View12th of April 2017, 5 years ago
Eruption with volcanic ash cloud at 2250 UTC (0750 local). Best estimate of ash-cloud top is around 19272 FT (5840 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest..
View11th of April 2017, 5 years ago
Eruption with volcanic ash cloud at 2322 UTC (0822 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 south..
ViewEruption produce volcanic ash cloud at 0106 UTC (1006 local). Best estimate of ash-cloud top is around 16104 FT (4880 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..
View10th of April 2017, 5 years ago
Eruption produced grey volcanic ash cloud at 2354 UTC (0854 local). Best estimate of ash-cloud top is around 17160 FT (5200 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south..
View8th of April 2017, 5 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.
