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.
USGS9th of March 2023, 2 weeks ago
Eruption with volcanic ash cloud at 2242 UTC (0542 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 southwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0013 UTC (0713 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 southwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
View8th of March 2023, 2 weeks ago
Eruption with volcanic ash cloud at 2230 UTC (0530 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 south. Volcanic ash is observed to be white to brown. The intensity of volcanic ash is observed to be medium..
View6th of March 2023, 2 weeks ago
Eruption with volcanic ash cloud at 2247 UTC (0547 local). Best estimate of ash-cloud top is around 13043 FT (4076 M) above sea level or 1280 FT (400 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from north to northeast. Volcanic ash is observed to be gray to dark. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 2212 UTC (0512 local). Best estimate of ash-cloud top is around 12723 FT (3976 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 white to brown. The intensity of volcanic ash is observed to be medium..
View26th of February 2023, 3 weeks ago
Eruption with volcanic ash cloud at 0925 UTC (1625 local). Best estimate of ash-cloud top is around 12656 FT (3955 M) above sea level or 480 FT (150 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..
View25th of February 2023, 1 month ago
Eruption at 2104 UTC (0404 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewAsh-cloud is not observed. Ash-cloud is not observed. Ash-cloud is not observed..
View23rd of February 2023, 1 month ago
Eruption with volcanic ash cloud at 0005 UTC (0705 local). Best estimate of ash-cloud top is around 14963 FT (4676 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 from east to southeast. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
View22nd of February 2023, 1 month ago
Eruption with volcanic ash cloud at 0010 UTC (0710 local). Best estimate of ash-cloud top is around 14963 FT (4676 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 north. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
View21st of February 2023, 1 month ago
Eruption with volcanic ash cloud at 2233 UTC (0533 local). Best estimate of ash-cloud top is around 14323 FT (4476 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 east. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
View20th of February 2023, 1 month ago
Eruption with volcanic ash cloud at 2230 UTC (0530 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 southeast. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
View19th of February 2023, 1 month ago
Eruption with volcanic ash cloud at 2322 UTC (0622 local). Best estimate of ash-cloud top is around 14003 FT (4376 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 northeast. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
View18th of February 2023, 1 month ago
Eruption with volcanic ash cloud at 2339 UTC (0639 local). Best estimate of ash-cloud top is around 14963 FT (4676 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 white to gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 2304 UTC (0604 local). Best estimate of ash-cloud top is around 14323 FT (4476 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 white to 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.
