VONA
What is VONA?

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.

USGS

16th of December 2022, 1 month ago


Semeru - 20221216/0928Z

Mukdas Sofian, A.Md., 1 month ago

Eruption with volcanic ash cloud at 0928 UTC (1628 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.

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15th of December 2022, 1 month ago


Semeru - 20221215/2155Z

Mukdas Sofian, A.Md., 1 month ago

Eruption with volcanic ash cloud at 2155 UTC (0455 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.

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Anak Krakatau - 20221215/0331Z

Jumono, 1 month ago

Eruption with volcanic ash cloud at 0331 UTC (1031 local). Best estimate of ash-cloud top is around 2742 FT (857 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.

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Anak Krakatau - 20221215/0235Z

Jumono, 1 month ago

Eruption with volcanic ash cloud at 0235 UTC (0935 local). Best estimate of ash-cloud top is around 822 FT (257 M) above sea level or 320 FT (100 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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14th of December 2022, 1 month ago


Semeru - 20221214/2215Z

Liswanto, A.P., 1 month ago

Eruption with volcanic ash cloud at 2215 UTC (0515 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.

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13th of December 2022, 1 month ago


Semeru - 20221213/2312Z

Mukdas Sofian, A.Md., 1 month ago

Eruption with volcanic ash cloud at 2312 UTC (0612 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.

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Semeru - 20221213/2214Z

Liswanto, A.P., 1 month ago

Eruption with volcanic ash cloud at 2214 UTC (0514 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.

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12th of December 2022, 1 month ago


Semeru - 20221212/0000Z

Yadi Yuliandi, A.Md., 1 month ago

Eruption with volcanic ash cloud at 0000 UTC (0700 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.

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10th of December 2022, 1 month ago


Semeru - 20221210/2352Z

Liswanto, A.P., 1 month ago

Eruption with volcanic ash cloud at 2352 UTC (0652 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.

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9th of December 2022, 1 month ago


Semeru - 20221209/2353Z

Liswanto, A.P., 1 month ago

Eruption with volcanic ash cloud at 2353 UTC (0653 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.

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Kerinci - 20221209/0348Z

Irwan Safwan, S.T., 1 month ago

Increasing in volcanic activity. Ash-cloud is not observed.

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8th of December 2022, 1 month ago


Semeru - 20221208/2221Z

Liswanto, A.P., 1 month ago

Eruption with volcanic ash cloud at 2221 UTC (0521 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.

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7th of December 2022, 2 months ago


Semeru - 20221207/2236Z

Liswanto, A.P., 1 month ago

Eruption with volcanic ash cloud at 2236 UTC (0536 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.

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6th of December 2022, 2 months ago


Semeru - 20221206/2259Z

Yadi Yuliandi, A.Md., 2 months ago

Eruption with volcanic ash cloud at 2259 UTC (0559 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.

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Kerinci - 20221206/0122Z

Irwan Safwan, S.T., 2 months ago

Eruption with volcanic ash cloud at 0122 UTC (0822 local). Best estimate of ash-cloud top is around 14416 FT (4505 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.

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VONA Color Code
Green

Volcano 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.


Yellow

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.


Orange

Volcano is exhibiting heightened unrest with increased likelihood of eruption with column height below 6000 meter above sea level.


Red

Eruption is forecast to be imminent with significant emission of ash with column height above 6000 meter above sea level.

Archived

Old Vona