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.
USGS20th of December 2021, 5 months ago
Gas emission detected at 0010 UTC (0710 local). Best estimate of ash-cloud top is around 14416 FT (4505 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. No ash detected..
View14th of October 2021, 7 months ago
Gas emission at 10.51 UTC (17.30 Lokal) Best estimate of ash-cloud top is around 14576 FT (4555 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Volcanic plume moving to East.
View13th of June 2021, 11 months ago
Gas emission at 1030 UTC (1730 lokal) Best estimate of ash-cloud top is around 14416 FT (4505 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Volcanic Plume moving to west.
View30th of May 2021, 11 months ago
Gas emission at 1114 UTC (0614 lokal). Best estimate of ash-cloud top is around 14416 FT (4505 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Volcanic Plume moving to nort west.
View21st of March 2021, 1 year ago
Eruption with volcanic gas emission at 2215 (0615 local). Eruption and gas emission is not continuing Best estimate of ash-cloud top is around 14096 FT (4405 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Gas emission moving to southwest.
View16th of October 2020, 1 year ago
Eruption with volkanic ash cloud at 1040 UTC ( 0340 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 48629 FT (14736 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash plume moving to north-east.
View15th of August 2020, 1 year ago
On 15 Agustus 2020, observed brown ash emission at 00:31 UTC ( 07:31 Local Time ) Best estimate of ash-cloud top is around 48629 FT (14736 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving Northwest.
View13th of August 2020, 1 year ago
On 13 Agustus 2020, observed brown ash emission at 05:25 UTC ( 12:25 Local Time ) Best estimate of ash-cloud top is around 46517 FT (14096 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving East-NorthEast.
View12th of August 2020, 1 year ago
On 12 Agustus 2020, observed brown ash emission at 09:02 UTC ( 16:02 Local Time ) Best estimate of ash-cloud top is around 50741 FT (15376 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving East-Southeast-NorthEast.
View9th of August 2020, 1 year ago
On 9 Agustus 2020, observed brown ash emission at 04:40 UTC ( 11:40 Local Time ). Best estimate of ash-cloud top is around 46517 FT (14096 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving East-Northeast.
View7th of August 2020, 1 year ago
On 7 Agustus 2020, observed brown ash emission at 03:24 UTC ( 10:24 Local Time ) Best estimate of ash-cloud top is around 46517 FT (14096 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving East-Southeast-Northeast.
View14th of April 2020, 2 years ago
On 14 April 2020, observed brown ash emission at 03:27 UTC ( 10:27 Local Time ) Best estimate of ash-cloud top is around 46517 FT (14096 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving West-Southwest-East-Northeast..
ViewOn 14 April 2020, observed brown ash emission at 02:47 UTC ( 09:47 Local Time ) Best estimate of ash-cloud top is around 44405 FT (13456 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving Northwest-Northeast.
View13th of April 2020, 2 years ago
On 13 April 2020, observed brown ash emission at 09:36 UTC ( 16:36 Local Time ) Best estimate of ash-cloud top is around 50741 FT (15376 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving East-Southeast.
ViewOn 13 April 2020, observed brown ash emission at 06:03 UTC ( 13:03 Local Time ). Best estimate of ash-cloud top is around 48629 FT (14736 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving East-Northeast.
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.
