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 October 2021, 1 day ago
Eruption with volcanic ash cloud at 0200 UTC (0900 local). Best estimate of ash-cloud top is around 12403 FT (3876 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest..
View15th of October 2021, 1 week ago
Eruption with volcanic ash cloud at 2323 UTC (0823 local). Best estimate of ash-cloud top is around 6160 FT (1925 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.
View14th of October 2021, 1 week 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.
ViewIli Lewotolok - 20211014/2219Z
Eruption with volcanic ash cloud at 2217 UTC (0617 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.
ViewIli Lewotolok - 20211014/2206Z
Eruption with volcanic ash cloud at 2203 UTC (0603 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to East.
ViewIli Lewotolok - 20211014/1520Z
Eruption with volcanic ash cloud at 1507 UTC (2307 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.
ViewIli Lewotolok - 20211014/0912Z
Eruption with volcanic ash cloud at 0911 UTC (1711 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
ViewIli Lewotolok - 20211014/0854Z
Eruption with volcanic ash cloud at 0856 UTC (1656 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6954 FT (2173 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
View13th of October 2021, 1 week ago
Eruption with volcanic ash cloud at 0158 UTC (0858 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 14003 FT (4376 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.
View11th of October 2021, 1 week ago
Eruption with volcanic ash cloud at 2137 UTC (0437 local) Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. ash-cloud moving to west.
View10th of October 2021, 1 week ago
Eruption with volcanic ash cloud at 2302 UTC (0602 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.
View9th of October 2021, 1 week ago
Eruption with volcanic ash cloud at 0751 UTC (1651 local). Best estimate of ash-cloud top is around 5520 FT (1725 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northeast..
View7th of October 2021, 2 weeks ago
Ili Lewotolok - 20211007/0923Z
Eruption with volcanic ash cloud at 0928 UTC (1728 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6474 FT (2023 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to West.
ViewIli Lewotolok - 20211007/0908Z
Eruption with volcanic ash cloud at 0913 UTC (1713 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6314 FT (1973 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to West.
ViewIli Lewotolok - 20211007/0857Z
Eruption with volcanic ash cloud at 0903 UTC (1703 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 10707 FT (3346 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.
