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.
USGS11th 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
Anak Krakatau - 20200206/0213Z
Eruption with volcanic ash cloud at 0149 UTC (0849 local) Ash-cloud not visible. Anak Krakatau volcano is not clear..
View15th of January 2020, 1 month ago
Anak Krakatau - 20200115/0501Z
Eruption with volcanic ash cloud at 0318 UTC (1018 local). Ash-cloud not visible. visually from cctv crater seen volcanic ash moving to south, volcanic ash black thick 150 meters high from the bottom of the crater. .
View7th of January 2020, 1 month ago
Anak Krakatau - 20200107/0213Z
Recorded eruption at 00:36 UTC (07:36 local ) Best estimate of ash-cloud top is around 1142 FT (357 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. visually from cctv crater seen volcanic ash moving to east, volcanic ash white-gray thick 200 meters high from the bottom of the crater. .
View1st of January 2020, 1 month ago
Anak Krakatau - 20200101/0352Z
Eruption with volcanic ash cloud at 0345 UTC (1045 local). Best estimate of ash-cloud top is around 2742 FT (857 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Thick gray volcanic ash from the top of the crater. Ash cloud is moving to southeast. .
View31st of December 2019, 1 month ago
Anak Krakatau - 20191231/0651Z
Recorded eruption at 06:31 UTC (13:31 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. White grey ash cloud is moving to east.
ViewAnak Krakatau - 20191231/0005Z
Eruption with ash clouds at 23:51 UTC (06:51 local time). 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. Thick gray-black volcanic ash from the top of the crater. Ash-cloud moving to south..
View30th of December 2019, 1 month ago
Anak Krakatau - 20191230/0646Z
Eruption with ash clouds at 06:35 UTC (13:35 local time). 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 south..
ViewAnak Krakatau - 20191230/0137Z
Tremor recorded on seismogram with maximum amplitude 55 mm and still recorded continuously. Gas emission and small eruption seen continuously Best estimate of ash-cloud top is around 6902 FT (2157 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White grey ash cloud is moving to South.
View28th of December 2019, 1 month ago
Anak Krakatau - 20191228/2308Z
Recorded eruption at 22:29 UTC (05:29 local ) Best estimate of ash-cloud top is around 662 FT (207 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. visually from cctv crater seen volcanic ash moving to north, volcanic ash black-gray thick 200 meters high from the bottom of the crater. .
View13th of November 2019, 3 months ago
Anak Krakatau - 20191113/1132Z
Recorded eruption at 09:50 UTC (16:50 local ) Best estimate of ash-cloud top is around 662 FT (207 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. visually from cctv crater seen volcanic ash moving to north, volcanic ash white-black thick 200 meters high from the bottom of the crater. .
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.
