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
 

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 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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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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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 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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22nd of January 2023, 1 week ago

2023-01-22 22:48:00 UTC Orange

Semeru - 20230122/2248Z

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 1 week ago

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. 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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21st of January 2023, 1 week ago

2023-01-21 23:36:00 UTC Orange

Semeru - 20230121/2336Z

Ghufron Alwi, Semeru Volcano Observatory - 1 week ago

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

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2023-01-21 22:48:00 UTC Orange

Semeru - 20230121/2248Z

Liswanto, A.P., Semeru Volcano Observatory - 1 week 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. Ash cloud moving to north. Volcanic ash is observed to be white to brown. The intensity of volcanic ash is observed to be medium..

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2023-01-21 22:30:00 UTC Orange

Semeru - 20230121/2230Z

Liswanto, A.P., Semeru Volcano Observatory - 1 week 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. Ash cloud moving to north. Volcanic ash is observed to be white to brown. The intensity of volcanic ash is observed to be medium..

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20th of January 2023, 1 week ago

2023-01-20 23:15:00 UTC Orange

Semeru - 20230120/2315Z

Liswanto, A.P., Semeru Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 2315 UTC (0615 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 southeast. Volcanic ash is observed to be white to brown. The intensity of volcanic ash is observed to be medium..

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2023-01-20 22:48:00 UTC Orange

Semeru - 20230120/2248Z

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 2248 UTC (0548 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 white to 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.