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
 

24th of December 2021, 7 months ago

2021-12-24 16:31:00 UTC Orange

Semeru - 20211224/1631Z 

Liswanto, A.P., Semeru Volcano Observatory - 7 months ago

Pyroclastic flow occured from the edge of lava deposit at 1619 UTC (2319) Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.

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22nd of December 2021, 7 months ago

2021-12-22 15:27:00 UTC Orange

Semeru - 20211222/1527Z 

Ahmad Basuki, S.Si, M.Si., Semeru Volcano Observatory - 7 months ago

Pyroclastic flow occured from the edge of lava deposit at 1511 UTC ( 2211 local ) Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south-southwest.

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2021-12-22 03:28:00 UTC Orange

Semeru - 20211222/0328Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 7 months ago

Pyroclastic flow occured from the edge of lava deposit at 0327 UTC ( 1027 local ) Ash-cloud not visible. Ash-cloud moving to southeast..

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19th of December 2021, 7 months ago

2021-12-19 22:58:00 UTC Orange

Semeru - 20211219/2258Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 7 months ago

Pyroclastic flow occured from the edge of lava deposit at 256 UTC ( 0556 local ) Ash-cloud not visible. Ash-cloud moving to southeast..

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18th of December 2021, 7 months ago

2021-12-18 22:44:00 UTC Orange

Semeru - 20211218/2244Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 7 months ago

Pyroclastic flow occured from the edge of lava deposit at 2231 UTC ( 0531 local ) Ash-cloud not visible. Ash-cloud moving to South West.

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16th of December 2021, 7 months ago

2021-12-16 08:41:00 UTC Orange

Semeru - 20211216/0841Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 7 months ago

Pyroclastic flow occured from the edge of lava deposit at 0842 UTC ( 1542 local ) Ash-cloud not visible. Ash-cloud moving to southeast.

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7th of December 2021, 8 months ago

2021-12-07 17:14:00 UTC Orange

Semeru - 20211207/1714Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 8 months ago

Pyroclastic flow occured from the edge of lava deposit at 1701 UTC ( 0001 local ) Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.

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6th of December 2021, 8 months ago

2021-12-06 19:51:00 UTC Orange

Semeru - 20211206/1951Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 8 months ago

Pyroclastic flow occured from the edge of lava deposit at 1944 UTC ( 0244 local ) Best estimate of ash-cloud top is around 14963 FT (4676 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.

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2021-12-06 02:07:00 UTC Orange

Semeru - 20211206/0207Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 8 months ago

Pyroclastic flow occured from the edge of lava deposit at 0155 UTC ( 0855 local ) Ash-cloud not visible. Ash-cloud moving to southeast.

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1st of December 2021, 8 months ago

2021-12-01 21:36:00 UTC Orange

Semeru - 20211201/2136Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 8 months ago

Eruption with volcanic ash cloud at 2142 UTC (0442 local). Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.

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28th of November 2021, 8 months ago

2021-11-28 22:04:00 UTC Orange

Semeru - 20211128/2204Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 8 months ago

Eruption with volcanic ash cloud at 2205 UTC (0505 local). Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.

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2021-11-28 07:53:00 UTC Orange

Semeru - 20211128/0753Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 8 months ago

Eruption with volcanic ash cloud at 0800 UTC (1500 local). Best estimate of ash-cloud top is around 13043 FT (4076 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south.

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27th of November 2021, 8 months ago

2021-11-27 00:19:00 UTC Orange

Semeru - 20211127/0019Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 8 months ago

Eruption with volcanic ash cloud at 0024 UTC (0724 local) Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.

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25th of November 2021, 8 months ago

2021-11-25 22:48:00 UTC Orange

Semeru - 20211125/2248Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 8 months ago

Eruption with volcanic ash cloud at 2256 UTC (0556 local) Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north.

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24th of November 2021, 8 months ago

2021-11-24 22:23:00 UTC Orange

Semeru - 20211124/2223Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 8 months ago

Eruption with volcanic ash cloud at 2327 UTC (0527 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 14003 FT (4376 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west and south west.

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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.