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

27th of January 2023, 1 week ago


Semeru - 20230127/0102Z

Mukdas Sofian, A.Md., 1 week ago VEN

Eruption with volcanic ash cloud at 0102 UTC (0802 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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26th of January 2023, 1 week ago


Semeru - 20230126/2234Z

Ghufron Alwi, 1 week ago VEN

Eruption with volcanic ash cloud at 2234 UTC (0534 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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Anak Krakatau - 20230126/0032Z

Jumono, 1 week ago VEN

Eruption with volcanic ash cloud at 0032 UTC (0732 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.

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25th of January 2023, 1 week ago


Anak Krakatau - 20230125/2333Z

Jumono, 1 week ago VEN

Eruption with volcanic ash cloud at 2333 UTC (0633 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.

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Anak Krakatau - 20230125/2212Z

Jumono, 1 week ago VEN

Eruption with volcanic ash cloud at 2212 UTC (0512 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.

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Anak Krakatau - 20230125/1703Z

Ade Yasser Akhmad Purwata, 1 week ago VEN

Eruption at 1703 UTC (0003 local). Ash-cloud is not observed.

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Anak Krakatau - 20230125/1556Z

Ade Yasser Akhmad Purwata, 1 week ago VEN

Eruption at 1556 UTC (2256 local). Ash-cloud is not observed.

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24th of January 2023, 2 weeks ago


Semeru - 20230124/2240Z

Mukdas Sofian, A.Md., 1 week ago VEN

Eruption with volcanic ash cloud at 2240 UTC (0540 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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Semeru - 20230124/2150Z

Mukdas Sofian, A.Md., 1 week ago VEN

Eruption with volcanic ash cloud at 2150 UTC (0450 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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Anak Krakatau - 20230124/1931Z

Jumono, 1 week ago VEN

Eruption at 1931 UTC (0231 local). Ash-cloud is not observed.

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Anak Krakatau - 20230124/1611Z

Ade Yasser Akhmad Purwata, 1 week ago VEN

Eruption at 1611 UTC (2311 local). Ash-cloud is not observed.

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Anak Krakatau - 20230124/1529Z

Ade Yasser Akhmad Purwata, 1 week ago VEN

Eruption at 1529 UTC (2229 local). Ash-cloud is not observed.

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Anak Krakatau - 20230124/1413Z

Ade Yasser Akhmad Purwata, 1 week ago VEN

Ash-cloud is not observed. Ash-cloud is not observed.

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Anak Krakatau - 20230124/1257Z

Jumono, 1 week ago VEN

Eruption with volcanic ash cloud at 1257 UTC (1957 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.

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Anak Krakatau - 20230124/1150Z

Ade Yasser Akhmad Purwata, 1 week ago VEN

Ash-cloud is not observed. Ash-cloud is not observed.

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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