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
 

21st of April 2021, 1 year ago

2021-04-21 23:44:00 UTC Orange

Semeru - 20210421/2344Z 

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

Eruption with volcanic ash cloud at 2348 UTC (0648 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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2021-04-21 00:58:00 UTC Orange

Semeru - 20210421/0058Z 

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

Eruption with volcanic ash cloud at 0103 UTC (0803 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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20th of April 2021, 1 year ago

2021-04-20 22:48:00 UTC Orange

Semeru - 20210420/2248Z 

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

Eruption with volcanic ash cloud at 2257 UTC (0557 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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19th of April 2021, 1 year ago

2021-04-19 22:09:00 UTC Orange

Semeru - 20210419/2209Z 

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

Eruption with volcanic ash cloud at 2218 UTC (0518local) 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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18th of April 2021, 1 year ago

2021-04-18 23:47:00 UTC Orange

Semeru - 20210418/2347Z 

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

Eruption with volcanic ash cloud at 2350 UTC (0650 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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21st of March 2021, 1 year ago

2021-03-21 22:41:00 UTC Orange

Semeru - 20210321/2241Z 

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

Eruption with volcanic ash cloud at 2246 UTC (0546 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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17th of March 2021, 1 year ago

2021-03-17 23:12:00 UTC Orange

Semeru - 20210317/2312Z 

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

Eruption with volcanic ash cloud at 2320 UTC (0620 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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15th of March 2021, 1 year ago

2021-03-15 23:11:00 UTC Orange

Semeru - 20210315/2311Z 

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

Eruption with volcanic ash cloud at 2319 UTC (0619 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.

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12th of March 2021, 1 year ago

2021-03-12 22:33:00 UTC Orange

Semeru - 20210312/2233Z 

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

Eruption with volcanic ash cloud at 2238 UTC (0538local) 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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1st of February 2021, 1 year ago

2021-02-01 23:54:00 UTC Orange

Semeru - 20210201/2354Z 

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

Eruption with volcanic ash cloud at 2336 UTC (0636 local) Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northeast.

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21st of January 2021, 1 year ago

2021-01-21 22:23:00 UTC Orange

Semeru - 20210121/2223Z 

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

Eruption with volcanic ash cloud at 2256 UTC (0526 local) Best estimate of ash-cloud top is around 41986 FT (12723 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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20th of January 2021, 1 year ago

2021-01-20 23:14:00 UTC Orange

Semeru - 20210120/2314Z 

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

Eruption with volcanic ash cloud at 2150 UTC (0450 local) Best estimate of ash-cloud top is around 43042 FT (13043 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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16th of January 2021, 1 year ago

2021-01-16 10:51:00 UTC Orange

Semeru - 20210116/1051Z 

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

Eruption with volcanic ash cloud at 1024 UTC (1724 local) Best estimate of ash-cloud top is around 59938 FT (18163 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. ash-cloud moving to northeast..

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23rd of December 2020, 1 year ago

2020-12-23 08:46:00 UTC Orange

Semeru - 20201223/0846Z 

Dany Erlangga Yosa Putra, A.Md., Semeru Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 08:39 UTC/ Local Time 15:39 WIB Best estimate of ash-cloud top is around 44098 FT (13363 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-Cloud moving to the South..

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12th of December 2020, 1 year ago

2020-12-12 22:45:00 UTC Orange

Semeru - 20201212/2245Z 

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

Eruption with volcanic ash cloud at 2223 UTC (0523 local) Best estimate of ash-cloud top is around 44098 FT (13363 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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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.