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.
USGS16th of January 2022, 2 days ago
Eruption with volcanic ash cloud at 2234 UTC (0534 local). Eruption and ash emission is continuing. 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 north..
ViewPyroclastic flow occured from the edge of lava deposit at 03:20 UTC ( 1020 local ) Best estimate of ash-cloud top is around 16563 FT (5176 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.
View15th of January 2022, 3 days ago
Eruption with volcanic ash cloud at 0215 UTC (0915 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 north.
View11th of January 2022, 1 week ago
Ili Lewotolok - 20220111/0100Z
Eruption with volcanic ash cloud at 0048 UTC (0848 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6794 FT (2123 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east.
View7th of January 2022, 1 week ago
Pyroclastic flow occured from the edge of lava deposit at 1759 UTC ( 0059 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.
ViewPyroclastic flow occured from the edge of lava deposit at 1611 UTC ( 2311 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. Lava flow is observed through the Southeast direction of the Semeru summit crater..
View5th of January 2022, 1 week ago
Pyroclastic flow occured from the edge of lava deposit at 0135 UTC ( 0835 local ) Best estimate of ash-cloud top is around 16563 FT (5176 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south.
View4th of January 2022, 2 weeks ago
Ili Lewotolok - 20220104/0228Z
Eruption with volcanic ash cloud at 0229 UTC (1025 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 East southeast.
View3rd of January 2022, 2 weeks ago
Eruption with volcanic ash cloud at 2238 UTC (0538 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 vertical.
ViewPyroclastic flow occured from the edge of lava deposit at 0525 UTC ( 1225 local ) Ash-cloud not visible. Ash-cloud moving to southeast..
ViewEruption with volcanic ash cloud at 0334 UTC (1034 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 14323 FT (4476 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
View30th of December 2021, 2 weeks ago
Pyroclastic flow occured from the edge of lava deposit at 2131 UTC ( 0431 local ) Best estimate of ash-cloud top is around 18163 FT (5676 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.
View28th of December 2021, 3 weeks ago
Eruption with volcanic ash cloud at 0202 UTC (0902 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 north.
View25th of December 2021, 3 weeks ago
Eruption with volcanic ash cloud at 1006 UTC (1706 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.
View24th of December 2021, 3 weeks ago
Pyroclastic flow occured from the edge of lava deposit at 1619 UTC (2319) 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.
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.
