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
 

5th of September 2021, 2 months ago

2021-09-05 22:44:00 UTC Orange

Semeru - 20210905/2244Z 

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

Eruption with volcanic ash cloud at 2249 UTC (0549 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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1st of September 2021, 3 months ago

2021-09-01 22:38:00 UTC Orange

Semeru - 20210901/2238Z 

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

Eruption with volcanic ash cloud at 2244 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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26th of August 2021, 3 months ago

2021-08-26 02:42:00 UTC Orange

Ili Lewotolok - 20210826/0242Z 

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

Eruption with volcanic ash cloud at 0239 UTC (1039 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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2021-08-26 00:13:00 UTC Orange

Semeru - 20210826/0013Z 

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

Eruption with volcanic ash cloud at 0018 UTC (0718 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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25th of August 2021, 3 months ago

2021-08-25 06:46:00 UTC Orange

Ili Lewotolok - 20210825/0646Z 

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

Eruption with volcanic ash cloud at 0622 UTC (1422 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 8394 FT (2623 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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22nd of August 2021, 3 months ago

2021-08-22 05:20:00 UTC Orange

Ili Lewotolok - 20210822/0520Z 

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

Eruption with volcanic ash cloud at 0444 UTC (1244 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 9354 FT (2923 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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21st of August 2021, 3 months ago

2021-08-21 06:42:00 UTC Orange

Ili Lewotolok - 20210821/0642Z 

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

Eruption with volcanic ash cloud at 0641 UTC (1441 local). Eruption and ash emission is not coutinuing. 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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19th of August 2021, 3 months ago

2021-08-19 04:54:00 UTC Orange

Semeru - 20210819/0454Z 

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

Eruption with volcanic ash cloud at 0117 UTC (0817 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 vertical.

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18th of August 2021, 3 months ago

2021-08-18 10:20:00 UTC Orange

Ili Lewotolok - 20210818/1020Z 

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

Eruption with volcanic ash cloud at 0956 UTC (1756 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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17th of August 2021, 3 months ago

2021-08-17 23:01:00 UTC Orange

Ibu - 20210817/2301Z 

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

Eruption with volcanic ash cloud at 2257 UTC (0757 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. Grey ash-cloud moving to west.

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16th of August 2021, 3 months ago

2021-08-16 23:49:00 UTC Orange

Semeru - 20210816/2349Z 

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

Eruption with volcanic ash cloud at 2319 UTC (0619 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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15th of August 2021, 3 months ago

2021-08-15 23:17:00 UTC Orange

Semeru - 20210815/2317Z 

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

Eruption with volcanic ash cloud at 2322 UTC (0622 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 west..

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2021-08-15 23:09:00 UTC Orange

Merapi - 20210815/2309Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 3 months ago

Eruption with volcanic ash cloud at 2253 UTC (0553 local). Eruption and ash emission has stopped. Best estimate of ash-cloud top is around 11418 FT (3568 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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11th of August 2021, 3 months ago

2021-08-11 03:32:00 UTC Orange

Semeru - 20210811/0332Z 

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

Eruption with volcanic ash cloud at 0340 UTC (1040 local). Eruption and ash emission is continuing. 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 Northwest.

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2021-08-11 03:22:00 UTC Orange

Ili Lewotolok - 20210811/0322Z 

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

Eruption with volcanic ash cloud at 0317 UTC (1117 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 10954 FT (3423 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.