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 September 2023, 2 weeks ago
Anak Krakatau - 20230911/0142Z
Eruption with volcanic ash cloud at 0142 UTC (0842 local). Best estimate of ash-cloud top is around 3702 FT (1157 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
View10th of September 2023, 2 weeks ago
Anak Krakatau - 20230910/0536Z
Eruption with volcanic ash cloud at 0536 UTC (1236 local). Best estimate of ash-cloud top is around 3702 FT (1157 M) above sea level or 3200 FT (1000 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 to dark. The intensity of volcanic ash is observed to be thick..
View20th of July 2023, 2 months ago
Anak Krakatau - 20230720/0152Z
Eruption with volcanic ash cloud at 0152 UTC (0852 local). Best estimate of ash-cloud top is around 6902 FT (2157 M) above sea level or 6400 FT (2000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230720/0151Z
Eruption with volcanic ash cloud at 0151 UTC (0851 local). Best estimate of ash-cloud top is around 5302 FT (1657 M) above sea level or 4800 FT (1500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230720/0143Z
Eruption with volcanic ash cloud at 0143 UTC (0843 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 northwest. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
View19th of June 2023, 3 months ago
Anak Krakatau - 20230619/0122Z
Eruption with volcanic ash cloud at 0122 UTC (0822 local). Best estimate of ash-cloud top is around 5302 FT (1657 M) above sea level or 4800 FT (1500 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 white to gray. The intensity of volcanic ash is observed to be thick..
View10th of June 2023, 3 months ago
Anak Krakatau - 20230610/1730Z
Eruption with volcanic ash cloud at 1730 UTC (0030 local). Best estimate of ash-cloud top is around 6902 FT (2157 M) above sea level or 6400 FT (2000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230610/1050Z
Eruption with volcanic ash cloud at 1050 UTC (1750 local). Best estimate of ash-cloud top is around 11702 FT (3657 M) above sea level or 11200 FT (3500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230610/0731Z
Eruption with volcanic ash cloud at 0731 UTC (1431 local). Best estimate of ash-cloud top is around 5302 FT (1657 M) above sea level or 4800 FT (1500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View9th of June 2023, 3 months ago
Anak Krakatau - 20230609/2123Z
Eruption with volcanic ash cloud at 2123 UTC (0423 local). Best estimate of ash-cloud top is around 6902 FT (2157 M) above sea level or 6400 FT (2000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230609/0146Z
Eruption with volcanic ash cloud at 0146 UTC (0846 local). Best estimate of ash-cloud top is around 10102 FT (3157 M) above sea level or 9600 FT (3000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
ViewAnak Krakatau - 20230609/0046Z
Eruption with volcanic ash cloud at 0046 UTC (0746 local). Best estimate of ash-cloud top is around 3062 FT (957 M) above sea level or 2560 FT (800 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View8th of June 2023, 3 months ago
Anak Krakatau - 20230608/0837Z
Eruption with volcanic ash cloud at 0837 UTC (1537 local). Best estimate of ash-cloud top is around 3702 FT (1157 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
View7th of June 2023, 3 months ago
Anak Krakatau - 20230607/1722Z
Eruption with volcanic ash cloud at 1722 UTC (0022 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 northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View6th of June 2023, 3 months ago
Anak Krakatau - 20230606/0734Z
Eruption with volcanic ash cloud at 0734 UTC (1434 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 northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be 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.
