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.
USGS6th of October 2021, 2 weeks ago
Ili Lewotolok - 20211006/0930Z
Eruption with volcanic ash cloud at 0920 UTC (1720 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6154 FT (1923 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest..
View5th of October 2021, 2 weeks ago
Ili Lewotolok - 20211005/2342Z
Eruption with volcanic ash cloud at 2347 UTC (0747 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 Northwest.
ViewIli Lewotolok - 20211005/0018Z
Eruption with volcanic ash cloud at 0001 UTC (0801 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 Northwest.
View1st of October 2021, 3 weeks ago
Ili Lewotolok - 20211001/0137Z
Eruption with volcanic ash cloud at 0118UTC (0918 local). Eruption and ash emission is 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.
View28th of September 2021, 3 weeks ago
Eruption with volcanic ash cloud at 2231 UTC (0531 local) Best estimate of ash-cloud top is around 13043 FT (4076 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.
View22nd of September 2021, 1 month ago
Eruption with volcanic ash cloud at 0130 UTC (0830 local). Eruption and ash emission is continuing. 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 West..
View19th of September 2021, 1 month ago
Eruption with volcanic ash cloud at 2226 UTC (0526 local) 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.
View18th of September 2021, 1 month ago
Eruption with volcanic ash cloud at 0235 UTC (1135 local). Best estimate of ash-cloud top is around 7440 FT (2325 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west..
ViewEruption with volcanic ash cloud at 0131 UTC (10.31 local). Best estimate of ash-cloud top is around 6800 FT (2125 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
ViewEruption with volcanic ash cloud at 0022 UTC (0922 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 West.
View15th of September 2021, 1 month ago
Eruption with volcanic ash cloud at 2320 UTC (0620 local) 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..
View14th of September 2021, 1 month ago
Eruption with volcanic ash cloud at 2303 UTC (0603 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 West..
View6th of September 2021, 1 month ago
Eruption with volcanic ash cloud at 0016 UTC (0916 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. Grey ash-cloud moving to north.
View5th of September 2021, 1 month ago
Eruption with volcanic ash cloud at 2249 UTC (0549 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 north.
View1st of September 2021, 1 month ago
Volcano 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.
