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
 

6th of August 2022, 5 days ago

2022-08-06 00:22:00 UTC Orange

Semeru - 20220806/0022Z 

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

Eruption with volcanic ash cloud at 0020 UTC (0720 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 north.

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5th of August 2022, 6 days ago

2022-08-05 05:51:00 UTC Orange

Semeru - 20220805/0551Z 

Mukdas Sofian, A.Md., Semeru Volcano Observatory - 5 days ago

Eruption with volcanic ash cloud at 0545 UTC (1245 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 north..

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4th of August 2022, 1 week ago

2022-08-04 02:31:00 UTC Orange

Anak Krakatau - 20220804/0231Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 6 days ago

Eruption with ash clouds at 02:26 UTC (09:26 local time). The eruption lasted for 52 seconds. Best estimate of ash-cloud top is around 5302 FT (1657 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black grey eruption smoke 1500m from the top of the volcano, the wind direction slowly to the north..

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3rd of August 2022, 1 week ago

2022-08-03 23:30:00 UTC Orange

Semeru - 20220803/2330Z 

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

Eruption with volcanic ash cloud at 2328 UTC (0628 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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2022-08-03 09:16:00 UTC Orange

Anak Krakatau - 20220803/0916Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 1 week ago

Eruption with ash clouds at 08:40 UTC (15:40 local time). The eruption lasted for 776 seconds. Best estimate of ash-cloud top is around 2742 FT (857 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 700m from the top of the volcano, the wind direction slowly to the southwest..

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2022-08-03 01:14:00 UTC Orange

Semeru - 20220803/0114Z 

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

Eruption with volcanic ash cloud at 0110 UTC (0810 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 north.

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2nd of August 2022, 1 week ago

2022-08-02 22:58:00 UTC Orange

Semeru - 20220802/2258Z 

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

Eruption with volcanic ash cloud at 2255 UTC (0555 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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2022-08-02 18:22:00 UTC Orange

Anak Krakatau - 20220802/1822Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 week ago

Eruption with ash clouds at 18:15 UTC (01:15 local time). The eruption lasted for 52 seconds. Best estimate of ash-cloud top is around 2102 FT (657 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 500m from the top of the volcano, the wind direction slowly to the southwest..

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2022-08-02 17:46:00 UTC Orange

Anak Krakatau - 20220802/1746Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 week ago

Eruption with ash clouds at 17:34 UTC (00:34 local time). The eruption lasted for 39 seconds. Best estimate of ash-cloud top is around 1142 FT (357 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 200m from the top of the volcano, the wind direction slowly to the southwest..

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2022-08-02 16:06:00 UTC Orange

Anak Krakatau - 20220802/1606Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 week ago

Eruption with ash clouds at 15:49 UTC (22:49 local time). The eruption lasted for 66 seconds. Best estimate of ash-cloud top is around 2102 FT (657 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 500m from the top of the volcano, the wind direction slowly to the southwest..

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2022-08-02 12:26:00 UTC Orange

Anak Krakatau - 20220802/1226Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 week ago

Eruption with ash clouds at 12:06 UTC (19:06 local time). The eruption lasted for 95 seconds. Best estimate of ash-cloud top is around 2102 FT (657 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick black eruption smoke 500m from the top of the volcano, the wind direction slowly to the southwest..

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2022-08-02 09:39:00 UTC Orange

Anak Krakatau - 20220802/0939Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 1 week ago

Eruption with ash clouds at 08:49 UTC (15:49 local time). The eruption lasted for 32 seconds. Best estimate of ash-cloud top is around 5302 FT (1657 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick grey eruption smoke 1500m from the top of the volcano, the wind direction slowly to the northeast..

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1st of August 2022, 1 week ago

2022-08-01 00:59:00 UTC Orange

Semeru - 20220801/0059Z 

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

Eruption with volcanic ash cloud at 0057 UTC (0757 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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31st of July 2022, 1 week ago

2022-07-31 01:27:00 UTC Orange

Semeru - 20220731/0127Z 

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

Eruption with volcanic ash cloud at 0125 UTC (0825 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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30th of July 2022, 1 week ago

2022-07-30 10:55:00 UTC Orange

Ibu - 20220730/1055Z 

Axl Roeroe, Ibu Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 1036 UTC (1936 local). Best estimate of ash-cloud top is around 13840 FT (4325 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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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.