Archived
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
 

29th of January 2023, 1 day ago

2023-01-29 12:38:00 UTC Orange

Ibu - 20230129/1238Z

Axl Roeroe, Ibu Volcano Observatory - 20 hours ago

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. Ash cloud moving to east. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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28th of January 2023, 2 days ago

2023-01-28 23:39:00 UTC Orange

Semeru - 20230128/2339Z

Sigit Rian Alfian, Semeru Volcano Observatory - 1 day 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. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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2023-01-28 23:39:00 UTC Orange

Semeru - 20230128/2339Z

Sigit Rian Alfian, Semeru Volcano Observatory - 1 day 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. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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2023-01-28 23:02:00 UTC Orange

Semeru - 20230128/2302Z

Sigit Rian Alfian, Semeru Volcano Observatory - 1 day ago

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. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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27th of January 2023, 3 days ago

2023-01-27 16:28:00 UTC Orange

Anak Krakatau - 20230127/1628Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 2 days ago

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

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2023-01-27 14:44:00 UTC Orange

Anak Krakatau - 20230127/1444Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 2 days ago

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

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2023-01-27 14:35:00 UTC Orange

Anak Krakatau - 20230127/1435Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 2 days ago

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

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2023-01-27 06:12:00 UTC Orange

Anak Krakatau - 20230127/0612Z

Anggi Nuryo Saputro, A.Md., Anak Krakatau Volcano Observatory - 3 days ago

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. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed from thin to medium..

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2023-01-27 01:02:00 UTC Orange

Semeru - 20230127/0102Z

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 3 days ago

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. Ash cloud moving to north. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..

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26th of January 2023, 4 days ago

2023-01-26 22:34:00 UTC Orange

Semeru - 20230126/2234Z

Ghufron Alwi, Semeru Volcano Observatory - 3 days ago

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. Ash cloud moving to northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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2023-01-26 00:32:00 UTC Orange

Anak Krakatau - 20230126/0032Z

Jumono, Anak Krakatau Volcano Observatory - 4 days ago

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. Ash cloud moving to southeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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25th of January 2023, 5 days ago

2023-01-25 23:33:00 UTC Orange

Anak Krakatau - 20230125/2333Z

Jumono, Anak Krakatau Volcano Observatory - 4 days ago

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. Ash cloud moving to southeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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2023-01-25 22:12:00 UTC Orange

Anak Krakatau - 20230125/2212Z

Jumono, Anak Krakatau Volcano Observatory - 4 days ago

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. Ash cloud moving to east. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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2023-01-25 17:03:00 UTC Orange

Anak Krakatau - 20230125/1703Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 4 days ago

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

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2023-01-25 15:56:00 UTC Orange

Anak Krakatau - 20230125/1556Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 4 days ago

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

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VONA Color Code

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.


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.