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
 

24th of January 2023, 6 days ago

2023-01-24 22:40:00 UTC Orange

Semeru - 20230124/2240Z

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 5 days ago

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. 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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2023-01-24 21:50:00 UTC Orange

Semeru - 20230124/2150Z

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 5 days ago

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. 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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2023-01-24 19:31:00 UTC Orange

Anak Krakatau - 20230124/1931Z

Jumono, Anak Krakatau Volcano Observatory - 5 days ago

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

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2023-01-24 16:11:00 UTC Orange

Anak Krakatau - 20230124/1611Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 5 days ago

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

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2023-01-24 15:29:00 UTC Orange

Anak Krakatau - 20230124/1529Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 5 days ago

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

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2023-01-24 14:13:00 UTC Green

Anak Krakatau - 20230124/1413Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 5 days ago

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

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2023-01-24 12:57:00 UTC Orange

Anak Krakatau - 20230124/1257Z

Jumono, Anak Krakatau Volcano Observatory - 5 days ago

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. 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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2023-01-24 11:50:00 UTC Green

Anak Krakatau - 20230124/1150Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 5 days ago

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

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23rd of January 2023, 1 week ago

2023-01-23 22:10:00 UTC Orange

Semeru - 20230123/2210Z

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 6 days ago

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

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

Anak Krakatau - 20230123/0228Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 1 week ago

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. 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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2023-01-23 01:08:00 UTC Orange

Anak Krakatau - 20230123/0108Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 1 week ago

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

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2023-01-23 00:59:00 UTC Orange

Anak Krakatau - 20230123/0059Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 1 week ago

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

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2023-01-23 00:58:00 UTC Orange

Anak Krakatau - 20230123/0058Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 1 week ago

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

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2023-01-23 00:50:00 UTC Orange

Semeru - 20230123/0050Z

Ghufron Alwi, Semeru Volcano Observatory - 1 week ago

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. 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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2023-01-23 00:01:00 UTC Orange

Anak Krakatau - 20230123/0001Z

Ade Yasser Akhmad Purwata, Anak Krakatau Volcano Observatory - 1 week ago

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. 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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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.