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.
USGS13th of July 2019, 4 years ago
Anak Krakatau - 20190713/1557Z
Eruption with ash clouds at 15:40 UTC (22:40 local time). The eruption lasted for 52 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau Volcano is not clear..
View12th of July 2019, 4 years ago
Eruption with volcanic ash cloud at 0048 UTC (0948 local) Best estimate of ash-cloud top is around 17203 FT (5213 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north and northeast.
View11th of July 2019, 4 years ago
Anak Krakatau - 20190711/0608Z
Eruption with ash clouds at 05:17 UTC (12:17 local time). The eruption lasted for 182 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau Volcano is not clear..
View10th of July 2019, 4 years ago
Anak Krakatau - 20190710/1118Z
Eruption with ash clouds at 10:43 UTC (17:43 local time). The eruption lasted for 220 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau Volcano is not clear..
ViewAnak Krakatau - 20190710/1114Z
Eruption with ash clouds at 10:38 UTC (17:38 local time). The eruption lasted for 64 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau Volcano is not clear..
ViewAnak Krakatau - 20190710/0427Z
Eruption with ash clouds at 04:04 UTC (11:04 local time). The eruption lasted for 22 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau Volcano is not clear..
ViewAnak Krakatau - 20190710/0423Z
Eruption with ash clouds at 04:03 UTC (11:03 local time). The eruption lasted for 47 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau Volcano is not clear..
View9th of July 2019, 4 years ago
Anak Krakatau - 20190709/1957Z
Eruption with volcanic ash cloud at 19:18 UTC (02:18 local). The eruption lasted for 74 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau Volcano is not clear..
ViewEruption with volcanic ash cloud at 0022 UTC (0922 local) Best estimate of ash-cloud top is around 21427 FT (6493 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west.
View8th of July 2019, 4 years ago
Eruption with volcanic ash cloud at 0030 UTC (0930 local) Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west.
View4th of July 2019, 4 years ago
Eruption with volcanic ash cloud at 0123 UTC (1023 local) Best estimate of ash-cloud top is around 15091 FT (4573 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east.
View3rd of July 2019, 4 years ago
Eruption with volcanic ash cloud at 0128 UTC (1028 local) Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east.
ViewAnak Krakatau - 20190703/0022Z
Eruption with ash clouds at 00:09 UTC (07:09 local time). The eruption lasted for 38 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau volcano is not clear..
View2nd of July 2019, 4 years ago
Anak Krakatau - 20190702/2248Z
Eruption with ash clouds at 22:07 UTC (05:07 local time). The eruption lasted for 34 seconds. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Anak Krakatau volcano is not clear..
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.
