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
 

7th of August 2021, 2 months ago

2021-08-07 23:45:00 UTC Orange

Merapi - 20210807/2345Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2158 UTC (0458 local). Eruption and ash emission has stopped. Best estimate of ash-cloud top is around 12698 FT (3968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud generated by pyroclastic density current moving to the west. .

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6th of August 2021, 2 months ago

2021-08-06 23:33:00 UTC Orange

Semeru - 20210806/2333Z 

Liswanto, A.P., Semeru Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2326 UTC (0626 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 vertical.

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5th of August 2021, 2 months ago

2021-08-05 06:51:00 UTC Orange

Ili Lewotolok - 20210805/0651Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 0650 UTC (1450 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 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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28th of July 2021, 2 months ago

2021-07-28 06:34:00 UTC Red

Sinabung - 20210728/0634Z 

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

Eruption with ash clouds at 06:20 UTC (13:20 local time). The eruption lasted for 742 seconds. Best estimate of ash-cloud top is around 22272 FT (6960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to E - S..

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2021-07-28 01:51:00 UTC Orange

Semeru - 20210728/0151Z 

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

Eruption with volcanic ash cloud at 0158 UTC (0858 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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27th of July 2021, 2 months ago

2021-07-27 23:47:00 UTC Orange

Ili Lewotolok - 20210727/2347Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 2322 UTC (0722 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 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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2021-07-27 16:46:00 UTC Orange

Ili Lewotolok - 20210727/1646Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 2 months ago

Eruption with volcanic ash cloud at 1624 UTC (0024 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 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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25th of July 2021, 2 months ago

2021-07-25 07:12:00 UTC Orange

Semeru - 20210725/0712Z 

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

Eruption with volcanic ash cloud at 0720 UTC (1420 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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21st of July 2021, 3 months ago

2021-07-21 13:05:00 UTC Orange

Sirung - 20210721/1305Z 

Devy Kamil Syahbana, Dr., S.Si., Sirung Volcano Observatory - 3 months ago

Ash emission was observed starting from 0844 UTC (16:44 local). Currently, ash emission is not observed. Best estimate of ash-cloud top is around 9158 FT (2862 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving north..

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19th of July 2021, 3 months ago

2021-07-19 11:57:00 UTC Orange

Sinabung - 20210719/1157Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 3 months ago

Eruption with ash clouds at 02:25 UTC (18:50 local time). The eruption lasted for 662 seconds. Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E-SE..

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14th of July 2021, 3 months ago

2021-07-14 22:25:00 UTC Orange

Ili Lewotolok - 20210714/2225Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 2218 UTC (0618 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.

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2021-07-14 03:39:00 UTC Orange

Semeru - 20210714/0339Z 

Yuda Prinardita Pura, A.Md., Semeru Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 0446 UTC (1146 local). Eruption and ash emission is continuing. 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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13th of July 2021, 3 months ago

2021-07-13 02:29:00 UTC Orange

Sinabung - 20210713/0229Z 

Moh Nurul Asrori, A.Md., Sinabung Volcano Observatory - 3 months ago

Eruption with ash clouds at 02:25 UTC (09:25 local time). The eruption lasted for 463 seconds. Best estimate of ash-cloud top is around 9472 FT (2960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E-SE..

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2021-07-13 02:08:00 UTC Orange

Ili Lewotolok - 20210713/0208Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 0206 UTC (1006 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.

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9th of July 2021, 3 months ago

2021-07-09 22:19:00 UTC Orange

Ibu - 20210709/2219Z 

Novia Antika Anggraeni, S.Si., Ibu Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 2220 UTC (0720 local) Best estimate of ash-cloud top is around 6800 FT (2125 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.