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

5th of February 2023, 2 days ago


Semeru - 20230205/0542Z

Yadi Yuliandi, A.Md., 1 day ago VEN

Eruption with volcanic ash cloud at 0542 UTC (1242 local). Best estimate of ash-cloud top is around 16563 FT (5176 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.

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Kerinci - 20230205/0022Z

Irwan Safwan, S.T., 2 days ago VEN

Eruption with volcanic ash cloud at 0022 UTC (0722 local). Best estimate of ash-cloud top is around 12816 FT (4005 M) above sea level or 640 FT (200 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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4th of February 2023, 3 days ago


Bromo - 20230204/0154Z

Wahyu Andrian Kusuma, 3 days ago

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

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3rd of February 2023, 4 days ago


Kerinci - 20230203/2346Z

Irwan Safwan, S.T., 3 days ago VEN

Eruption with volcanic ash cloud at 2346 UTC (0646 local). Best estimate of ash-cloud top is around 12816 FT (4005 M) above sea level or 640 FT (200 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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2nd of February 2023, 5 days ago


Kerinci - 20230202/1930Z

Irwan Safwan, S.T., 4 days ago VEN

Eruption at 1930 UTC (0230 local). Ash-cloud is not observed.

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Semeru - 20230202/0000Z

Liswanto, A.P., 5 days ago

Eruption with volcanic ash cloud at 0000 UTC (0700 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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1st of February 2023, 6 days ago


Semeru - 20230201/0029Z

Sigit Rian Alfian, 6 days ago VEN

Eruption with volcanic ash cloud at 0029 UTC (0729 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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29th of January 2023, 1 week ago


Ibu - 20230129/1238Z

Axl Roeroe, 1 week ago VEN

Eruption with volcanic ash cloud at 1238 UTC (2138 local). Best estimate of ash-cloud top is around 7440 FT (2325 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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28th of January 2023, 1 week ago


Semeru - 20230128/2339Z

Sigit Rian Alfian, 1 week ago

Eruption with volcanic ash cloud at 2339 UTC (0639 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 - 20230128/2339Z

Sigit Rian Alfian, 1 week ago VEN

Eruption with volcanic ash cloud at 2339 UTC (0639 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 - 20230128/2302Z

Sigit Rian Alfian, 1 week ago VEN

Eruption with volcanic ash cloud at 2302 UTC (0602 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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27th of January 2023, 1 week ago


Anak Krakatau - 20230127/1628Z

Ade Yasser Akhmad Purwata, 1 week ago VEN

Eruption at 1628 UTC (2328 local). Ash-cloud is not observed.

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Anak Krakatau - 20230127/1444Z

Ade Yasser Akhmad Purwata, 1 week ago VEN

Eruption at 1444 UTC (2144 local). Ash-cloud is not observed.

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Anak Krakatau - 20230127/1435Z

Ade Yasser Akhmad Purwata, 1 week ago VEN

Eruption at 1435 UTC (2135 local). Ash-cloud is not observed.

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Anak Krakatau - 20230127/0612Z

Anggi Nuryo Saputro, A.Md., 1 week ago VEN

Eruption with volcanic ash cloud at 0612 UTC (1312 local). Best estimate of ash-cloud top is around 1622 FT (507 M) above sea level or 1120 FT (350 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