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 September 2023, 1 week ago
Eruption with volcanic ash cloud at 0150 UTC (0850 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be medium..
ViewEruption with volcanic ash cloud at 0122 UTC (0822 local). Best estimate of ash-cloud top is around 13363 FT (4176 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 north. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be medium..
View19th of September 2023, 1 week ago
Ili Lewotolok - 20230919/0831Z
Eruption with volcanic ash cloud at 0831 UTC (1631 local). Best estimate of ash-cloud top is around 6794 FT (2123 M) above sea level or 2240 FT (700 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 white to gray. The intensity of volcanic ash is observed to be thick..
ViewIli Lewotolok - 20230919/0544Z
Eruption with volcanic ash cloud at 0544 UTC (1344 local). Best estimate of ash-cloud top is around 6474 FT (2023 M) above sea level or 1920 FT (600 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..
View13th of September 2023, 2 weeks ago
Ili Lewotolok - 20230913/2120Z
Eruption with volcanic ash cloud at 2120 UTC (0520 local). Best estimate of ash-cloud top is around 6474 FT (2023 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from west to northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 1049 UTC (1949 local). Best estimate of ash-cloud top is around 6800 FT (2125 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 northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View12th of September 2023, 2 weeks ago
Ili Lewotolok - 20230912/0625Z
Eruption with volcanic ash cloud at 0625 UTC (1425 local). Best estimate of ash-cloud top is around 6474 FT (2023 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be medium..
View11th 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..
View5th of September 2023, 3 weeks ago
Eruption with volcanic ash cloud at 0242 UTC (1142 local). Best estimate of ash-cloud top is around 6160 FT (1925 M) above sea level or 1920 FT (600 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..
View3rd of September 2023, 3 weeks ago
Ili Lewotolok - 20230903/1123Z
Eruption at 1123 UTC (1923 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewIli Lewotolok - 20230903/0352Z
Eruption with volcanic ash cloud at 0352 UTC (1152 local). Best estimate of ash-cloud top is around 6154 FT (1923 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 white to gray. The intensity of volcanic ash is observed to be thick..
View1st of September 2023, 4 weeks ago
Ili Lewotolok - 20230901/2143Z
Eruption with volcanic ash cloud at 2143 UTC (0543 local). Best estimate of ash-cloud top is around 6794 FT (2123 M) above sea level or 2240 FT (700 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from west to northwest. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
ViewIli Lewotolok - 20230901/2115Z
Eruption with volcanic ash cloud at 2115 UTC (0515 local). Best estimate of ash-cloud top is around 6474 FT (2023 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from west to northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewIli Lewotolok - 20230901/0735Z
Eruption with volcanic ash cloud at 0735 UTC (1535 local). Best estimate of ash-cloud top is around 6154 FT (1923 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 from west 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.
