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
 

20th of May 2022, 1 day ago

2022-05-20 22:28:00 UTC Orange

Semeru - 20220520/2228Z 

Liswanto, A.P., Semeru Volcano Observatory - 14 minutes ago

Eruption with volcanic ash cloud at 2225 UTC (0525 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 south .

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19th of May 2022, 2 days ago

2022-05-19 22:56:00 UTC Orange

Semeru - 20220519/2256Z 

Liswanto, A.P., Semeru Volcano Observatory - 23 hours ago

Eruption with volcanic ash cloud at 2252 UTC (0552 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. sh-cloud moving to south .

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18th of May 2022, 3 days ago

2022-05-18 22:28:00 UTC Orange

Semeru - 20220518/2228Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 2 days ago

Eruption with volcanic ash cloud at 2225 UTC (0525 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. sh-cloud moving to southwest.

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16th of May 2022, 5 days ago

2022-05-16 23:35:00 UTC Orange

Semeru - 20220516/2335Z 

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

Eruption with volcanic ash cloud at 2334 UTC (0634 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 southwest.

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13th of May 2022, 1 week ago

2022-05-13 23:11:00 UTC Orange

Semeru - 20220513/2311Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 6 days ago

Eruption with volcanic ash cloud at 2308 UTC (0608 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 north..

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10th of May 2022, 1 week ago

2022-05-10 23:07:00 UTC Orange

Semeru - 20220510/2307Z 

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 2314 UTC (0614 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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9th of May 2022, 1 week ago

2022-05-09 23:15:00 UTC Orange

Semeru - 20220509/2315Z 

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

Eruption with volcanic ash cloud at 2320 UTC (0620 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 Nort.

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8th of May 2022, 1 week ago

2022-05-08 22:13:00 UTC Orange

Semeru - 20220508/2213Z 

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

Eruption with volcanic ash cloud at 2220 UTC (0520 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 Vertical .

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7th of May 2022, 2 weeks ago

2022-05-07 02:46:00 UTC Orange

Semeru - 20220507/0246Z 

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

Eruption with volcanic ash cloud at 0255 UTC (0955 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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6th of May 2022, 2 weeks ago

2022-05-06 22:49:00 UTC Orange

Semeru - 20220506/2249Z 

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

Eruption with volcanic ash cloud at 2258 UTC (0558 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 Vertical.

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5th of May 2022, 2 weeks ago

2022-05-05 00:21:00 UTC Orange

Semeru - 20220505/0021Z 

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

Eruption with volcanic ash cloud at 0017 UTC (0717 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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4th of May 2022, 2 weeks ago

2022-05-04 22:06:00 UTC Orange

Semeru - 20220504/2206Z 

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

Eruption with volcanic ash cloud at 2215 UTC (0515 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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3rd of May 2022, 2 weeks ago

2022-05-03 23:01:00 UTC Orange

Semeru - 20220503/2301Z 

Liswanto, A.P., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 2306 UTC (0606 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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2022-05-03 02:34:00 UTC Orange

Semeru - 20220503/0234Z 

Liswanto, A.P., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0222 UTC (0922 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 southwest. .

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2nd of May 2022, 2 weeks ago

2022-05-02 00:06:00 UTC Orange

Semeru - 20220502/0006Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 0004 UTC (0704 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 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.