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.
USGS15th of March 2023, 1 week ago
Eruption with volcanic ash cloud at 0336 UTC (1036 local). Best estimate of ash-cloud top is around 13338 FT (4168 M) above sea level or 3840 FT (1200 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View13th of March 2023, 2 weeks ago
Eruption with volcanic ash cloud at 2250 UTC (0550 local). Best estimate of ash-cloud top is around 14298 FT (4468 M) above sea level or 4800 FT (1500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View12th of March 2023, 2 weeks ago
Eruption with volcanic ash cloud at 0919 UTC (1619 local). Best estimate of ash-cloud top is around 17498 FT (5468 M) above sea level or 8000 FT (2500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
ViewEruption with volcanic ash cloud at 0008 UTC (0708 local). Best estimate of ash-cloud top is around 15898 FT (4968 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.
View11th of March 2023, 2 weeks ago
Eruption with volcanic ash cloud at 0606 UTC (1306 local). Best estimate of ash-cloud top is around 19098 FT (5968 M) above sea level or 9600 FT (3000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
ViewEruption with volcanic ash cloud at 0512 UTC (1212 local). Best estimate of ash-cloud top is around 19098 FT (5968 M) above sea level or 9600 FT (3000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
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.
