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.
USGS4th of January 2016, 7 years ago
Eruption with volcanic ash cloud at 1253 UTC (2053 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 39956 FT (12108 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southeast..
View15th of December 2018, 4 years ago
Eruption with volcanic ash cloud at 2340 UTC (0540 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 93024 FT (28189 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 cloud started on 15 December 2018 at 17:02 UTC (16 December 2018 at 01:02 localtime). During the initial phase of the eruption, ash cloud was not visible due to heavy fog. Two hours later, we could see the summit and eruption was visible with an ash plume of around 3000 m above the summit or more than 4800 m above sea level. Eruption and ash emission are continuing. Best estimate of ash-cloud top is around 50784 FT (15389 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving Southeast. Ash fall was reported by people living in Liwitung area (SE of the volcano)..
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..
View3rd of October 2018, 4 years ago
Eruption with volcanic ash cloud at 1036 UTC (0636 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 34944 FT (10589 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..
ViewStrombolian eruption with ash cloud at 1414 UTC (2214 local time). Eruption and ash emission is still ongoing. Best estimate of ash-cloud top is around 45504 FT (13789 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Thick dark-grey volcanic cloud moved toward northwest..
ViewStrombolian eruption with volcanic ash cloud at 1414 UTC (2214 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 45504 FT (13789 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Thick dark-grey volcanic cloud moved toward northwest..
ViewEruption with volcanic ash cloud at 0943 UTC (1743 ocal). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 82464 FT (24989 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..
ViewEruption with volcanic ash cloud at 0352 UTC (1152 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 71904 FT (21789 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northwest..
ViewEruption with volcanic ash cloud at 0312 UTC (1112 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 45504 FT (13789 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. .
ViewEruption with volcanic ash cloud at 0244 UTC (1044 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 40224 FT (12189 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..
ViewEruption with volcanic ash cloud at 0047 UTC (0847 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 61344 FT (18589 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north west..
View2nd of October 2018, 4 years ago
Increasing in seismic events has been detected since end of August, 2018, and it still ongoing until present. 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 sign on volcanic ash at the surface yet..
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.
