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
 

16th of May 2020, 1 year ago

2020-05-16 02:53:00 UTC Orange

Semeru - 20200516/0253Z 

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

Eruption with volcanic ash cloud at 0249 UTC (0949 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 west.

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12th of May 2020, 1 year ago

2020-05-12 22:58:00 UTC Orange

Semeru - 20200512/2258Z 

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

Eruption with volcanic ash cloud at 2259 UTC (0559 local) Best estimate of ash-cloud top is around 40930 FT (12403 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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2020-05-12 02:41:00 UTC Orange

Semeru - 20200512/0241Z 

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

Eruption with volcanic ash cloud at 0242 UTC (0942 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. sh-cloud moving to north..

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7th of May 2020, 1 year ago

2020-05-07 22:12:00 UTC Orange

Semeru - 20200507/2212Z 

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

Eruption with volcanic ash cloud at 2211 UTC (0511 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 South.

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6th of May 2020, 1 year ago

2020-05-06 23:04:00 UTC Orange

Semeru - 20200506/2304Z 

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

Eruption with volcanic ash cloud at 2307 UTC (0607 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 south..

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4th of May 2020, 1 year ago

2020-05-04 23:18:00 UTC Orange

Semeru - 20200504/2318Z 

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

Eruption with volcanic ash cloud at 2300 UTC (0600 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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3rd of May 2020, 1 year ago

2020-05-03 23:07:00 UTC Orange

Semeru - 20200503/2307Z 

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

Eruption with volcanic ash cloud at 2309 UTC (0609 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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2020-05-03 02:15:00 UTC Orange

Semeru - 20200503/0215Z 

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

Eruption with volcanic ash cloud at 0218 UTC (0918 local) Best estimate of ash-cloud top is around 40930 FT (12403 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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2nd of May 2020, 1 year ago

2020-05-02 23:36:00 UTC Orange

Semeru - 20200502/2336Z 

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

Eruption with volcanic ash cloud at 0115 UTC (0615 local Best estimate of ash-cloud top is around 40930 FT (12403 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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1st of May 2020, 1 year ago

2020-05-01 23:35:00 UTC Orange

Semeru - 20200501/2335Z 

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

Eruption with volcanic ash cloud at 1135 UTC (0635 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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27th of April 2020, 1 year ago

2020-04-27 22:49:00 UTC Orange

Semeru - 20200427/2249Z 

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

Eruption with volcanic ash cloud at 2251 UTC (0551 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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25th of April 2020, 1 year ago

2020-04-25 00:33:00 UTC Orange

Semeru - 20200425/0033Z 

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

Eruption with volcanic ash cloud at 0032 UTC (0732 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 west.

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24th of April 2020, 1 year ago

2020-04-24 03:31:00 UTC Orange

Semeru - 20200424/0331Z 

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

Eruption with volcanic ash cloud at 0328 UTC (1028 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 south.

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22nd of April 2020, 1 year ago

2020-04-22 22:41:00 UTC Orange

Semeru - 20200422/2241Z 

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

Eruption with volcanic ash cloud at 0044 UTC (0544 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 west.

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21st of April 2020, 1 year ago

2020-04-21 23:22:00 UTC Orange

Semeru - 20200421/2322Z 

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

Eruption with volcanic ash cloud at 2323 UTC (0623 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 south.

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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.