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.
USGS20th of February 2020, 6 days ago
Eruption with volcanic ash cloud at 0213 UTC (1113 local) Best estimate of ash-cloud top is around 5520 FT (1725 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White to grey ash-cloud moving to southeast.
View17th of February 2020, 1 week ago
On 17 february 2020, observed brown ash emission at 00:48 UTC ( 07:48 Local Time ) Best estimate of ash-cloud top is around 13456 FT (4205 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving west..
View16th of February 2020, 1 week ago
Eruption with volcanic ash cloud at 0915 UTC (1815 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.
ViewOn 16 february 2020, observed brown ash emission at 23:00 UTC ( 06:00 Local Time ). Best estimate of ash-cloud top is around 13456 FT (4205 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving southwest..
View13th of February 2020, 1 week ago
Eruption with volcanic ash cloud at 0946 UTC ( 1846 local). Best estimate of ash-cloud top is around 4893 FT (1529 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
View12th of February 2020, 2 weeks ago
Eruption with volcanic ash cloud at 2216 UTC (0516 local). The eruption lasted for 105 seconds Best estimate of ash-cloud top is around 15898 FT (4968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northwest. .
View11th of February 2020, 2 weeks ago
Anak Krakatau - 20200211/0306Z
Eruption with ash clouds at 02:45 UTC (09:45 local time). The eruption lasted for 75 seconds. Ash-cloud not visible. Anak Krakatau volcano is not clear. .
View10th of February 2020, 2 weeks ago
Anak Krakatau - 20200210/1143Z
Eruption with volcanic ash cloud at 1137 UTC (1837 local) Best estimate of ash-cloud top is around 3702 FT (1157 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to East. Thick black volcanic ash from the top of the crater. .
View8th of February 2020, 2 weeks ago
Anak Krakatau - 20200208/1111Z
Eruption with volcanic ash cloud at 11.10 UTC (18:10 local) Ash-cloud not visible. Ash cloud is moving to North-West. Anak Krakatau .
ViewAnak Krakatau - 20200208/1108Z
Eruption with volcanic ash cloud at 11:04 UTC (18:04 local) Ash-cloud not visible. Ash cloud is moving to North-West. Anak Krakatau .
View7th of February 2020, 2 weeks ago
Anak Krakatau - 20200207/0657Z
Eruption with volcanic ash cloud at 0519 UTC (1219 local). Ash-cloud not visible. Anak Krakatau volcano is not clear..
View6th of February 2020, 2 weeks ago
Eruption with volcanic ash cloud at 0911 UTC ( 1811 local). Best estimate of ash-cloud top is around 5213 FT (1629 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 - 20200206/0213Z
Eruption with volcanic ash cloud at 0149 UTC (0849 local) Ash-cloud not visible. Anak Krakatau volcano is not clear..
View5th of February 2020, 3 weeks ago
Eruption with volcanic ash cloud at 2219 UTC (0719 local). Best estimate of ash-cloud top is around 4573 FT (1429 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east..
View4th of February 2020, 3 weeks 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.
