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. Ash cloud moving to east. Volcanic ash is observed to be gray to brown. The intensity of volcanic ash is observed to be medium..
View13th of March 2023, 1 week 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. Ash cloud moving from east to southeast. Volcanic ash is observed to be gray to brown. The intensity of volcanic ash is observed from medium to thick..
View12th of March 2023, 1 week 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. Ash cloud moving from north to northwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed from medium to thick..
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. Ash cloud moving from north to northwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed from medium to thick..
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. Ash cloud moving from west to northwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed from medium to thick..
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. Ash cloud moving from west to northwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
View9th of March 2022, 1 year ago
Eruption with volcanic ash cloud at 1618 UTC (2318 local). Eruption and ash emission is continuing Best estimate of ash-cloud top is around 19098 FT (5968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to the southeast..
View1st of December 2021, 1 year ago
Eruption with volcanic ash cloud at 1404 UTC (2104 local). Eruption has stopped. Best estimate of ash-cloud top is around 12698 FT (3968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east..
View15th of August 2021, 1 year ago
Eruption with volcanic ash cloud at 2253 UTC (0553 local). Eruption and ash emission has stopped. Best estimate of ash-cloud top is around 11418 FT (3568 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud generated by pyroclastic density current moving to the west..
View7th of August 2021, 1 year ago
Eruption with volcanic ash cloud at 2158 UTC (0458 local). Eruption and ash emission has stopped. Best estimate of ash-cloud top is around 12698 FT (3968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud generated by pyroclastic density current moving to the west. .
View29th of June 2021, 1 year ago
Eruption with volcanic ash cloud at 0432 UTC (1132 local). The eruption has stopped. Best estimate of ash-cloud top is around 11098 FT (3468 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud generated by PDC moving to the west. .
View24th of June 2021, 1 year ago
Eruption with volcanic ash cloud at 2144 UTC (0444 local). Eruption has stopped. Best estimate of ash-cloud top is around 12698 FT (3968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Wind direction to southeast. .
View9th of January 2021, 2 years ago
Pyroclastic density current with ash cloud at 0145 UTC (0845 local). Eruption has stopped. Best estimate of ash-cloud top is around 33455 FT (10138 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Pyroclastic density current heading northwest..
View21st of June 2020, 2 years ago
Ash-cloud is not visible after eruptions on 0213 and 0227 UTC. 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. Ash-cloud is not visible..
ViewEruption with volcanic ash cloud at 0213 UTC (0913 local) and 0227 UTC (0927 local) Best estimate of ash-cloud top is around 94703 FT (28698 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
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.
