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
 

30th of April 2022, 3 weeks ago

2022-04-30 23:32:00 UTC Orange

Semeru - 20220430/2332Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 weeks ago

Pyroclastic flow occured from the edge of lava deposit at 23:30 UTC ( 0630 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 southwest.

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29th of April 2022, 3 weeks ago

2022-04-29 23:15:00 UTC Orange

Semeru - 20220429/2315Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 2321 UTC (0621 local) 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 southwest..

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28th of April 2022, 3 weeks ago

2022-04-28 23:41:00 UTC Orange

Semeru - 20220428/2341Z 

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

Eruption with volcanic ash cloud at 2349 UTC (0649 local) 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 southwest.

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2022-04-28 22:22:00 UTC Orange

Semeru - 20220428/2222Z 

Liswanto, A.P., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2202 UTC (0502 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 Southwest .

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27th of April 2022, 3 weeks ago

2022-04-27 22:49:00 UTC Orange

Semeru - 20220427/2249Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2257 UTC (0557 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..

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2022-04-27 22:15:00 UTC Orange

Semeru - 20220427/2215Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2253 UTC (0523 local). Eruption and ash emission is continuing. 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 southeast..

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26th of April 2022, 3 weeks ago

2022-04-26 22:15:00 UTC Orange

Semeru - 20220426/2215Z 

Liswanto, A.P., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2222 UTC (0522 local) Best estimate of ash-cloud top is around 13683 FT (4276 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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2022-04-26 17:44:00 UTC Orange

Semeru - 20220426/1744Z 

Liswanto, A.P., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 1749 UTC (0049 local) Best estimate of ash-cloud top is around 13683 FT (4276 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 April 2022, 3 weeks ago

2022-04-25 22:23:00 UTC Orange

Semeru - 20220425/2223Z 

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

Eruption with volcanic ash cloud at 2231 UTC (0531 local) Best estimate of ash-cloud top is around 13683 FT (4276 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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23rd of April 2022, 4 weeks ago

2022-04-23 22:24:00 UTC Orange

Semeru - 20220423/2224Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2233 UTC (0533 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 west.

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2022-04-23 00:02:00 UTC Orange

Semeru - 20220423/0002Z 

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

Eruption with volcanic ash cloud at 0010 UTC (0710 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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22nd of April 2022, 4 weeks ago

2022-04-22 22:17:00 UTC Orange

Semeru - 20220422/2217Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 0024 UTC (0524 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 north.

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2022-04-22 00:28:00 UTC Orange

Semeru - 20220422/0028Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 0035 UTC (0735 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 southwest.

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21st of April 2022, 1 month ago

2022-04-21 22:15:00 UTC Orange

Semeru - 20220421/2215Z 

Liswanto, A.P., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 2212 UTC (0512 local). Eruption and ash emission is continuing. 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 west. .

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20th of April 2022, 1 month ago

2022-04-20 22:28:00 UTC Orange

Semeru - 20220420/2228Z 

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

Eruption with volcanic ash cloud at 2219 UTC (0519 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 12403 FT (3876 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to 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.