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.
USGS17th of December 2022, 3 months ago
Eruption with volcanic ash cloud at 0055 UTC (0755 local). Best estimate of ash-cloud top is around 14963 FT (4676 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View16th of December 2022, 3 months ago
Eruption with volcanic ash cloud at 2240 UTC (0540 local). Best estimate of ash-cloud top is around 14643 FT (4576 M) above sea level or 2880 FT (900 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
ViewEruption with volcanic ash cloud at 2211 UTC (0511 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
ViewEruption with volcanic ash cloud at 0928 UTC (1628 local). Best estimate of ash-cloud top is around 14003 FT (4376 M) above sea level or 2240 FT (700 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View15th of December 2022, 3 months ago
Eruption with volcanic ash cloud at 2155 UTC (0455 local). Best estimate of ash-cloud top is around 14963 FT (4676 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
ViewAnak Krakatau - 20221215/0331Z
Eruption with volcanic ash cloud at 0331 UTC (1031 local). Best estimate of ash-cloud top is around 2742 FT (857 M) above sea level or 2240 FT (700 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
ViewAnak Krakatau - 20221215/0235Z
Eruption with volcanic ash cloud at 0235 UTC (0935 local). Best estimate of ash-cloud top is around 822 FT (257 M) above sea level or 320 FT (100 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View14th of December 2022, 3 months ago
Eruption with volcanic ash cloud at 2215 UTC (0515 local). Best estimate of ash-cloud top is around 13043 FT (4076 M) above sea level or 1280 FT (400 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View13th of December 2022, 3 months ago
Eruption with volcanic ash cloud at 2312 UTC (0612 local). Best estimate of ash-cloud top is around 14003 FT (4376 M) above sea level or 2240 FT (700 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
ViewEruption with volcanic ash cloud at 2214 UTC (0514 local). Best estimate of ash-cloud top is around 13043 FT (4076 M) above sea level or 1280 FT (400 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View12th of December 2022, 3 months ago
Eruption with volcanic ash cloud at 0000 UTC (0700 local). Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View10th of December 2022, 3 months ago
Eruption with volcanic ash cloud at 2352 UTC (0652 local). Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View9th of December 2022, 3 months ago
Eruption with volcanic ash cloud at 2353 UTC (0653 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View8th of December 2022, 3 months ago
Eruption with volcanic ash cloud at 2221 UTC (0521 local). Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
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.
