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

23rd of January 2023, 2 weeks ago


Semeru - 20230123/2210Z

Mukdas Sofian, A.Md., 2 weeks ago VEN

Eruption with volcanic ash cloud at 2210 UTC (0510 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 - 20230123/0228Z

Ade Yasser Akhmad Purwata, 2 weeks ago VEN

Eruption with volcanic ash cloud at 0228 UTC (0928 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 - 20230123/0108Z

Ade Yasser Akhmad Purwata, 2 weeks ago VEN

Eruption with volcanic ash cloud at 0108 UTC (0808 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 - 20230123/0059Z

Ade Yasser Akhmad Purwata, 2 weeks ago VEN

Eruption with volcanic ash cloud at 0059 UTC (0759 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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Anak Krakatau - 20230123/0058Z

Ade Yasser Akhmad Purwata, 2 weeks ago VEN

Eruption with volcanic ash cloud at 0058 UTC (0758 local). Best estimate of ash-cloud top is around 1142 FT (357 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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Semeru - 20230123/0050Z

Ghufron Alwi, 2 weeks ago VEN

Eruption with volcanic ash cloud at 0050 UTC (0750 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.

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Anak Krakatau - 20230123/0001Z

Ade Yasser Akhmad Purwata, 2 weeks ago VEN

Eruption with volcanic ash cloud at 0001 UTC (0701 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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22nd of January 2023, 2 weeks ago


Anak Krakatau - 20230122/2307Z

Ade Yasser Akhmad Purwata, 2 weeks ago VEN

Eruption with volcanic ash cloud at 2307 UTC (0607 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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Semeru - 20230122/2248Z

Mukdas Sofian, A.Md., 2 weeks ago VEN

Eruption with volcanic ash cloud at 2248 UTC (0548 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 - 20230122/2142Z

Jumono, 2 weeks ago VEN

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

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Anak Krakatau - 20230122/1741Z

Ade Yasser Akhmad Purwata, 2 weeks ago VEN

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

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Ibu - 20230122/0042Z

Axl Roeroe, 2 weeks ago VEN

Eruption with volcanic ash cloud at 0042 UTC (0942 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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21st of January 2023, 2 weeks ago


Semeru - 20230121/2336Z

Ghufron Alwi, 2 weeks ago VEN

Eruption with volcanic ash cloud at 2336 UTC (0636 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.

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Semeru - 20230121/2248Z

Liswanto, A.P., 2 weeks ago

Eruption with volcanic ash cloud at 2248 UTC (0548 local). Best estimate of ash-cloud top is around 13843 FT (4326 M) above sea level or 2080 FT (650 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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Semeru - 20230121/2230Z

Liswanto, A.P., 2 weeks ago

Eruption with volcanic ash cloud at 2230 UTC (0530 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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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