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.
USGS24th of January 2023, 8 months ago
Anak Krakatau - 20230124/1150Z
Ash-cloud is not observed. Ash-cloud is not observed. Ash-cloud is not observed..
View23rd of January 2023, 8 months ago
Anak Krakatau - 20230123/0228Z
Eruption with volcanic ash cloud at 0228 UTC (0928 local). Best estimate of ash-cloud top is around 1462 FT (457 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230123/0108Z
Eruption with volcanic ash cloud at 0108 UTC (0808 local). Best estimate of ash-cloud top is around 1462 FT (457 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southeast. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230123/0059Z
Eruption with volcanic ash cloud at 0059 UTC (0759 local). Best estimate of ash-cloud top is around 2102 FT (657 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. Ash cloud moving to southeast. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230123/0058Z
Eruption with volcanic ash cloud at 0058 UTC (0758 local). Best estimate of ash-cloud top is around 1142 FT (357 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. Ash cloud moving to southeast. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230123/0001Z
Eruption with volcanic ash cloud at 0001 UTC (0701 local). Best estimate of ash-cloud top is around 1462 FT (457 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View22nd of January 2023, 8 months ago
Anak Krakatau - 20230122/2307Z
Eruption with volcanic ash cloud at 2307 UTC (0607 local). Best estimate of ash-cloud top is around 1462 FT (457 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230122/2142Z
Ash-cloud is not observed. Ash-cloud is not observed. Ash-cloud is not observed..
ViewAnak Krakatau - 20230122/1741Z
Ash-cloud is not observed. Ash-cloud is not observed. Ash-cloud is not observed..
View11th of January 2023, 8 months ago
Anak Krakatau - 20230111/1746Z
Eruption with volcanic ash cloud at 1746 UTC (0046 local). Best estimate of ash-cloud top is around 1462 FT (457 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast. Volcanic ash is observed to be dark. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230111/1625Z
Eruption with volcanic ash cloud at 1625 UTC (2325 local). Best estimate of ash-cloud top is around 1462 FT (457 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast. Volcanic ash is observed to be dark. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230111/1541Z
Eruption with volcanic ash cloud at 1541 UTC (2241 local). Best estimate of ash-cloud top is around 1142 FT (357 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. Ash cloud moving to northeast. Volcanic ash is observed to be dark. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230111/1054Z
Eruption with volcanic ash cloud at 1054 UTC (1754 local). Best estimate of ash-cloud top is around 1142 FT (357 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. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View4th of January 2023, 8 months ago
Anak Krakatau - 20230104/1713Z
Eruption with volcanic ash cloud at 1713 UTC (0013 local). Best estimate of ash-cloud top is around 2902 FT (907 M) above sea level or 2400 FT (750 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed from medium to thick..
ViewAnak Krakatau - 20230104/1713Z
Eruption with volcanic ash cloud at 1713 UTC (0013 local). Best estimate of ash-cloud top is around 2902 FT (907 M) above sea level or 2400 FT (750 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed from medium to thick..
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.
