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
 

17th of September 2020, 1 week ago

2020-09-17 23:12:00 UTC Orange

Semeru - 20200917/2312Z 

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

Eruption with volcanicash cloud at 2250 UTC (0550 ) local 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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16th of September 2020, 1 week ago

2020-09-16 22:44:00 UTC Orange

Semeru - 20200916/2244Z 

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

Eruption with volcanic ash cloud at 2246UTC (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 southeast.

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14th of September 2020, 1 week ago

2020-09-14 22:30:00 UTC Orange

Semeru - 20200914/2230Z 

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

Eruption with volcanic ash cloud at 2232 UTC (0532 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 northeast. .

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2020-09-14 02:44:00 UTC Orange

Semeru - 20200914/0244Z 

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

Eruption with volcanic ash cloud at 0249 UTC (0949local). 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 south..

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7th of September 2020, 2 weeks ago

2020-09-07 22:39:00 UTC Orange

Semeru - 20200907/2239Z 

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

Eruption with volcanic ash cloud at 2241 UTC (0541 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 south.

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30th of August 2020, 3 weeks ago

2020-08-30 05:06:00 UTC Orange

Semeru - 20200830/0506Z 

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

Eruption with volcanic ash cloud at 0255 UTC (0955 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 south.

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29th of August 2020, 3 weeks ago

2020-08-29 04:31:00 UTC Orange

Semeru - 20200829/0431Z 

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

Eruption with volcanic ash cloud at 0436 UTC (1136 local) 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 southwest.

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27th of August 2020, 4 weeks ago

2020-08-27 23:18:00 UTC Orange

Semeru - 20200827/2318Z 

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

Eruption with volcanic ash cloud at 2321 UTC (0621 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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24th of August 2020, 1 month ago

2020-08-24 23:31:00 UTC Orange

Semeru - 20200824/2331Z 

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

Eruption with volcanic ash cloud at 2332 UTC (0632 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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23rd of August 2020, 1 month ago

2020-08-23 22:39:00 UTC Orange

Semeru - 20200823/2239Z 

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

Eruption with volcanic ash cloud at 2344 UTC (0544 local) 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 southwest..

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21st of August 2020, 1 month ago

2020-08-21 22:52:00 UTC Orange

Semeru - 20200821/2252Z 

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

Eruption with volcanic ash cloud at 2347 UTC (0547 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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20th of August 2020, 1 month ago

2020-08-20 22:42:00 UTC Orange

Semeru - 20200820/2242Z 

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

Eruption with volcanic ash cloud at 2346 UTC (0546 local) Best estimate of ash-cloud top is around 24806 FT (7752 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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8th of August 2020, 1 month ago

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

Semeru - 20200808/2313Z 

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

Eruption with volcanic ash cloud at 2318 UTC (0618 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 west.

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2020-08-08 01:19:00 UTC Orange

Semeru - 20200808/0119Z 

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

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

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

Semeru - 20200807/2305Z 

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

Eruption with volcanic ash cloud at 2303 UTC (0603) 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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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.