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.
USGS5th of February 2023, 2 days ago
Eruption with volcanic ash cloud at 0542 UTC (1242 local). Best estimate of ash-cloud top is around 16563 FT (5176 M) above sea level or 4800 FT (1500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
ViewEruption with volcanic ash cloud at 0022 UTC (0722 local). Best estimate of ash-cloud top is around 12816 FT (4005 M) above sea level or 640 FT (200 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View3rd of February 2023, 4 days ago
Eruption with volcanic ash cloud at 2346 UTC (0646 local). Best estimate of ash-cloud top is around 12816 FT (4005 M) above sea level or 640 FT (200 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
View2nd of February 2023, 5 days ago
Eruption with volcanic ash cloud at 0000 UTC (0700 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.
View1st of February 2023, 6 days ago
Eruption with volcanic ash cloud at 0029 UTC (0729 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.
View29th of January 2023, 1 week ago
Eruption with volcanic ash cloud at 1238 UTC (2138 local). Best estimate of ash-cloud top is around 7440 FT (2325 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.
View28th of January 2023, 1 week ago
Eruption with volcanic ash cloud at 2339 UTC (0639 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 2339 UTC (0639 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 2302 UTC (0602 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.
View27th of January 2023, 1 week ago
Anak Krakatau - 20230127/0612Z
Eruption with volcanic ash cloud at 0612 UTC (1312 local). Best estimate of ash-cloud top is around 1622 FT (507 M) above sea level or 1120 FT (350 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
ViewEruption with volcanic ash cloud at 0102 UTC (0802 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.
