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.
USGS6th of August 2018, 4 years ago
Eruption with volcanic ash cloud at 0939 UTC (1839 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 North..
ViewEruption and volcanic ash cloud at 0013 UTC (0913 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 north-northeast..
View5th of August 2018, 4 years ago
Eruption with volcanic ash cloud at 0158 UTC (1058 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 North - Northeast..
View3rd of August 2018, 4 years ago
Eruption with volcanic ash cloud at 0943 UTC (1843 local). Best estimate of ash-cloud top is around 18259 FT (5533 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..
ViewEruption with volcanic ash cloud at 0112 UTC (1012 local). Ash fall at observatory post, about 11 Km north side of the crater. 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..
View2nd of August 2018, 4 years ago
Anak Krakatau - 20180802/0906Z
Eruption with ash clouds at 09:00 UTC (16:00 local time). The eruption lasted for 19 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
ViewAnak Krakatau - 20180802/0900Z
Eruption with ash clouds at 08:56 UTC (15:56 local time). The eruption lasted for 19 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
ViewAnak Krakatau - 20180802/0859Z
Eruption with ash clouds at 08:54 UTC (15:54 local time). The eruption lasted for 20 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
ViewAnak Krakatau - 20180802/0858Z
Eruption with ash clouds at 08:51 UTC (15:51 local time). The eruption lasted for 26 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
ViewAnak Krakatau - 20180802/0854Z
Eruption with ash clouds at 08:43 UTC (15:43 local time). The eruption lasted for 19 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 4277 FT (1296 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
ViewAnak Krakatau - 20180802/0853Z
Eruption with ash clouds at 08:42 UTC (15:42 local time). The eruption lasted for 13 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 5333 FT (1616 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
ViewAnak Krakatau - 20180802/0848Z
Eruption with ash clouds at 07:54 UTC (14:54 local time). The eruption lasted for 64 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6389 FT (1936 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
ViewAnak Krakatau - 20180802/0841Z
Eruption with ash clouds at 07:00 UTC (14:00 local time). The eruption lasted for 37 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6389 FT (1936 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
ViewAnak Krakatau - 20180802/0648Z
Eruption with ash clouds at 06:33 UTC (13:33 local time). The eruption lasted for 43 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6389 FT (1936 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..
View31st of July 2018, 4 years ago
Volcano 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.
