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
 

8th of August 2020, 1 year ago

2020-08-08 23:13:00 UTC Orange

Semeru - 20200808/2313Z 

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

Eruption with volcanic ash cloud at 2318 UTC (0618 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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2020-08-08 01:19:00 UTC Orange

Semeru - 20200808/0119Z 

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

Eruption with volcanic ash cloud at 0119 UTC (0819 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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7th of August 2020, 1 year ago

2020-08-07 23:05:00 UTC Orange

Semeru - 20200807/2305Z 

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

Eruption with volcanic ash cloud at 2303 UTC (0603) 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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28th of July 2020, 1 year ago

2020-07-28 00:14:00 UTC Orange

Semeru - 20200728/0014Z 

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

Eruption with volcanic ash cloud at 2313 UTC (0613 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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25th of July 2020, 1 year ago

2020-07-25 22:29:00 UTC Orange

Semeru - 20200725/2229Z 

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

Eruption with volcanic ash cloud at 2231 UTC (0531 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 south.

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2020-07-25 03:15:00 UTC Orange

Semeru - 20200725/0315Z 

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

Eruption with volcanic ash cloud at 0314 UTC (1014 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 south.

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24th of July 2020, 1 year ago

2020-07-24 23:01:00 UTC Orange

Semeru - 20200724/2301Z 

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

Eruption with volcanic ash cloud at 2253 UTC (0553 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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23rd of July 2020, 1 year ago

2020-07-23 23:09:00 UTC Orange

Semeru - 20200723/2309Z 

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

Eruption with volcanic ash cloud at 2312UTC (0612 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 south .

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22nd of July 2020, 1 year ago

2020-07-22 22:58:00 UTC Orange

Semeru - 20200722/2258Z 

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

Eruption with volcanic ash cloud at 2255 UTC (0555 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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16th of July 2020, 1 year ago

2020-07-16 23:09:00 UTC Orange

Semeru - 20200716/2309Z 

Mukdas Sofian, 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 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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2020-07-16 00:59:00 UTC Orange

Semeru - 20200716/0059Z 

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

Eruption with volcanic ash cloud at 0101 UTC (0801 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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10th of July 2020, 1 year ago

2020-07-10 23:09:00 UTC Orange

Semeru - 20200710/2309Z 

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

Eruption with volcanic ash cloud at 2313 UTC (0613 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 southwest.

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6th of July 2020, 1 year ago

2020-07-06 23:30:00 UTC Orange

Semeru - 20200706/2330Z 

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

Eruption with volcanic ash cloud at 2333 UTC (0633 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 west.

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26th of June 2020, 1 year ago

2020-06-26 22:48:00 UTC Orange

Semeru - 20200626/2248Z 

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

Eruption with volcanic ash cloud at 2247 UTC (0547 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 southwest.

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25th of June 2020, 1 year ago

2020-06-25 23:06:00 UTC Orange

Semeru - 20200625/2306Z 

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

Eruption with volcanic ash cloud at 2308 UTC (0608 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 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.