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.
USGS28th of July 2021, 1 week ago
Eruption with ash clouds at 06:20 UTC (13:20 local time). The eruption lasted for 742 seconds. Best estimate of ash-cloud top is around 22272 FT (6960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to E - S..
ViewEruption with volcanic ash cloud at 0158 UTC (0858 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 southwest.
View27th of July 2021, 1 week ago
Ili Lewotolok - 20210727/2347Z
Eruption with volcanic ash cloud at 2322 UTC (0722 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 - 20210727/1646Z
Eruption with volcanic ash cloud at 1624 UTC (0024 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 West.
View25th of July 2021, 1 week ago
Eruption with volcanic ash cloud at 0720 UTC (1420 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest.
View21st of July 2021, 2 weeks ago
Ash emission was observed starting from 0844 UTC (16:44 local). Currently, ash emission is not observed. Best estimate of ash-cloud top is around 9158 FT (2862 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving north..
View19th of July 2021, 2 weeks ago
Eruption with ash clouds at 02:25 UTC (18:50 local time). The eruption lasted for 662 seconds. Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E-SE..
View14th of July 2021, 3 weeks ago
Ili Lewotolok - 20210714/2225Z
Eruption with volcanic ash cloud at 2218 UTC (0618 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.
ViewEruption with volcanic ash cloud at 0446 UTC (1146 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 southwest..
View13th of July 2021, 3 weeks ago
Eruption with ash clouds at 02:25 UTC (09:25 local time). The eruption lasted for 463 seconds. Best estimate of ash-cloud top is around 9472 FT (2960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E-SE..
ViewIli Lewotolok - 20210713/0208Z
Eruption with volcanic ash cloud at 0206 UTC (1006 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 Northwest.
View9th of July 2021, 3 weeks ago
Eruption with volcanic ash cloud at 2220 UTC (0720 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.
View7th of July 2021, 4 weeks ago
Ili Lewotolok - 20210707/0251Z
Eruption with volcanic ash cloud at 0252 UTC (1052 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.
View6th of July 2021, 4 weeks ago
Ili Lewotolok - 20210706/2320Z
Eruption with volcanic ash cloud at 2257 UTC (0657 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 8074 FT (2523 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east.
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.
