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
 

13th of June 2021, 1 month ago

2021-06-13 21:27:00 UTC Orange

Ili Lewotolok - 20210613/2127Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2122 UTC (0522 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 16061 FT (5019 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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2021-06-13 11:05:00 UTC Yellow

Kerinci - 20210613/1105Z 

Irwan Safwan, S.T., Kerinci Volcano Observatory - 1 month ago

Gas emission at 1030 UTC (1730 lokal) Best estimate of ash-cloud top is around 14416 FT (4505 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Volcanic Plume moving to west.

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2021-06-13 01:01:00 UTC Orange

Ili Lewotolok - 20210613/0101Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0156 UTC (0856 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6794 FT (2123 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 June 2021, 1 month ago

2021-06-12 23:50:00 UTC Orange

Ili Lewotolok - 20210612/2350Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2347 UTC (0747 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6154 FT (1923 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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11th of June 2021, 1 month ago

2021-06-11 22:11:00 UTC Orange

Ili Lewotolok - 20210611/2211Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2206 UTC (0607 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 6794 FT (2123 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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2021-06-11 02:05:00 UTC Orange

Ili Lewotolok - 20210611/0205Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0200 UTC (1000 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6474 FT (2023 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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10th of June 2021, 1 month ago

2021-06-10 22:04:00 UTC Orange

Semeru - 20210610/2204Z 

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

Eruption with volcanic ash cloud at 2211 UTC (0511 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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2021-06-10 08:47:00 UTC Orange

Ili Lewotolok - 20210610/0847Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0839 UTC (1639 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 11027 FT (3446 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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9th of June 2021, 1 month ago

2021-06-09 10:52:00 UTC Orange

Ili Lewotolok - 20210609/1052Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1014 UTC (1814 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6154 FT (1923 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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2021-06-09 10:51:00 UTC Orange

Ili Lewotolok - 20210609/1051Z 

Fadlan Djamil, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1013 UTC (1813 local). Best estimate of ash-cloud top is around 6154 FT (1923 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds moving to west.

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6th of June 2021, 1 month ago

2021-06-06 23:52:00 UTC Orange

Semeru - 20210606/2352Z 

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

Eruption with volcanic ash cloud at 0000 UTC (0700 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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2021-06-06 16:42:00 UTC Orange

Sinabung - 20210606/1642Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 1 month ago

Eruption with ash clouds at 16:35 UTC (23:35 local time). The eruption lasted for 421 seconds. Ash-cloud not visible. The ashes are not observed because of closed fog.

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3rd of June 2021, 2 months ago

2021-06-03 13:05:00 UTC Orange

Sinabung - 20210603/1305Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 2 months ago

Eruption with ash clouds at 13:04 UTC (20:04 local time). The eruption lasted for 86 seconds. Ash-cloud not visible. The ashes are not observed because of closed fog.

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2021-06-03 01:19:00 UTC Orange

Semeru - 20210603/0119Z 

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

Eruption with volcanic ash cloud at 0123 UTC (0823 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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1st of June 2021, 2 months ago

2021-06-01 23:08:00 UTC Orange

Semeru - 20210601/2308Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2316 UTC (0616 local). Eruption and ash emission is continuing 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 southeast.

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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.