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.
USGS21st of August 2023, 1 month ago
Eruption at 1405 UTC (2105 local). Ash-cloud is not observed. Ash-cloud is not observed..
View26th of July 2023, 2 months ago
Eruption at 0847 UTC (1547 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewIncreasing in volcanic activity. Best estimate of ash-cloud top is around 16554 FT (5173 M) above sea level or 6400 FT (2000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from south to southwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed from medium to thick..
View25th of July 2023, 2 months ago
Eruption with volcanic ash cloud at 1415 UTC (2115 local). Best estimate of ash-cloud top is around 16554 FT (5173 M) above sea level or 6400 FT (2000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from south to southwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed from medium to thick..
View9th of November 2017, 5 years ago
Eruption with ash clouds at 09:51 UTC ( 16:51 local time). The eruption lasted for 180 seconds. Best estimate of ash-cloud top is around 44068 FT (13354 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south.
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.
