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.
USGS19th of December 2020, 1 year ago
Eruption with volcanic ash-cloud at 0926 UTC (1826 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. White to grey ash-cloud moving to north.
View4th of December 2020, 1 year ago
Eruption with volcanic ash cloud at 0617 UTC (1517 local) Best estimate of ash-cloud top is around 22440 FT (6800 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to east.
View27th of November 2020, 1 year ago
Eruption with volcanic ash cloud at 0918 UTC (1818 local) Best estimate of ash-cloud top is around 22440 FT (6800 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.
View18th of November 2020, 1 year ago
Eruption with volcanic ash-cloud at 2221 UTC (0721 local) Best estimate of ash-cloud top is around 22440 FT (6800 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.
View13th of November 2020, 1 year ago
Eruption with volcanic ash-cloud at 0040 UTC (0940 local) Best estimate of ash-cloud top is around 20328 FT (6160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White to grey ash-cloud moving to south.
View27th of September 2020, 1 year ago
Eruption with volcanic ash-cloud at 2054 UTC (0554 local) Best estimate of ash-cloud top is around 20328 FT (6160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White to grey ash-cloud moving to north..
View26th of September 2020, 1 year ago
Eruption with volcanic ash-cloud at 2141 UTC ( 0641 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. White to grey ash-cloud moving to north..
View25th of September 2020, 1 year ago
Eruption with volcanic ash cloud at 2054 UTC (0554 local) Best estimate of ash-cloud top is around 20328 FT (6160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White to grey ash-cloud moving to south..
View20th of September 2020, 1 year ago
Eruption with volcanic ash cloud at 2113 UTC (0613 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 north.
View5th of August 2020, 1 year ago
Eruption with volcanic ash cloud at 0850(1750 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.
View19th of May 2020, 2 years ago
Eruption with volcanic ash cloud at 2213 UTC (0713 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. White to grey ash-cloud moving to west.
View15th of May 2020, 2 years ago
Eruption with volcanic ash cloud at 2250 UTC (0750 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. White to grey ash-cloud moving to west.
View12th of May 2020, 2 years ago
Eruption with volcanic ash cloud at 0152 UTC ( 1052 local). Best estimate of ash-cloud top is around 22440 FT (6800 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.
View4th of May 2020, 2 years ago
Eruption with volcanic ash cloud at 0122 UTC (1022 local) Best estimate of ash-cloud top is around 22440 FT (6800 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to north.
View2nd of May 2020, 2 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.
