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
 

4th of February 2020, 3 weeks ago

2020-02-04 23:30:00 UTC Orange

Semeru - 20200204/2330Z 

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

Eruption with volcanic ash cloud at 2326 UTC (0626 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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2020-02-04 00:36:00 UTC Orange

Semeru - 20200204/0036Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0033 UTC (0733 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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1st of February 2020, 3 weeks ago

2020-02-01 23:05:00 UTC Orange

Semeru - 20200201/2305Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2256 UTC (0556 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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29th of January 2020, 4 weeks ago

2020-01-29 23:54:00 UTC Orange

Semeru - 20200129/2354Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 2351 UTC (0651 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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26th of January 2020, 1 month ago

2020-01-26 22:56:00 UTC Orange

Semeru - 20200126/2256Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 2243 UTC (0543 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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25th of January 2020, 1 month ago

2020-01-25 23:09:00 UTC Orange

Semeru - 20200125/2309Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 2259 UTC (0559 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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24th of January 2020, 1 month ago

2020-01-24 23:34:00 UTC Orange

Semeru - 20200124/2334Z 

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

Eruption with volcanic ash cloud at 2315 UTC (0615 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 north.

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23rd of January 2020, 1 month ago

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

Semeru - 20200123/2307Z 

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

Eruption volcanic ash cloude at 0043 (0543)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 cloude moving to west Seismic acttivity is caracterized by eruption,avalance and gas emision earthquarkes. .

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20th of January 2020, 1 month ago

2020-01-20 23:50:00 UTC Orange

Semeru - 20200120/2350Z 

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

Eruption with volcanic ash cloud at 2316 UTC (0616 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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19th of January 2020, 1 month ago

2020-01-19 22:52:00 UTC Orange

Semeru - 20200119/2252Z 

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

Eruption with volcanic ash cloud at 1235 UTC (0535 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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18th of January 2020, 1 month ago

2020-01-18 22:33:00 UTC Orange

Semeru - 20200118/2233Z 

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

Eruption with volcanic ash cloude at 0012 UTC (0512 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 cloude moving to west.

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2020-01-18 01:27:00 UTC Orange

Semeru - 20200118/0127Z 

Nia Haerani, Dr. S.T., M.T., Semeru Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0025 UTC (0725 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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26th of June 2019, 8 months ago

2019-06-26 03:53:00 UTC Orange

Semeru - 20190626/0353Z 

Martanto, S.T., Semeru Volcano Observatory - 7 months ago

Eruption with volcanic ash cloud at 0130 UTC (0830 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 southwest..

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9th of January 2017, 3 years ago

2017-01-09 01:59:00 UTC Yellow

Semeru - 20170109/0159Z 

Dr. Hetty Triastuty, S.Si, M.Sc., Semeru Volcano Observatory - 3 years ago

On January 8, 2017, seismic instruments of Semeru volcano detected 38 eruptions from the active crater, Jonggring Seloko. Visually, eruptions produced a greyish-white ash column with a height up to 12716 ft (3876 m) above sea level. Volcanic ash spread to north. 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. Volcanic ash spread 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.