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
 

26th of March 2018, 3 years ago

2018-03-26 02:26:00 UTC Orange

Agung - 20180326/0226Z 

Wahyu Ardi Setiawan, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 0209 UTC (1009 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 38458 FT (11654 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving Northwest.

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11th of March 2018, 3 years ago

2018-03-11 16:20:00 UTC Orange

Agung - 20180311/1620Z 

Anwar Sidiq, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 1532 UTC (2332 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 41626 FT (12614 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving east..

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10th of March 2018, 3 years ago

2018-03-10 18:03:00 UTC Yellow

Agung - 20180310/1803Z 

Devy Kamil Syahbana, Dr., S.Si., Agung Volcano Observatory - 3 years ago

In the past week, occasionally white steam plume can be observed with a maximum height of about 600 m above the summit crater. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Wind is moving East and West.

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13th of February 2018, 3 years ago

2018-02-13 04:20:00 UTC Orange

Agung - 20180213/0420Z 

Wahyu Ardi Setiawan, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 0349 UTC (1149 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 49018 FT (14854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to East.

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2018-02-13 04:00:00 UTC Orange

Agung - 20180213/0400Z 

Wahyu Ardi Setiawan, Agung Volcano Observatory - 3 years ago

Occasionally, white steam plume can be observed with a height of about 50-100 m above the crater. Best estimate of ash-cloud top is around 49018 FT (14854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Wind is moving East.

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10th of February 2018, 3 years ago

2018-02-10 23:39:00 UTC Yellow

Agung - 20180210/2339Z 

Devy Kamil Syahbana, Dr., S.Si., Agung Volcano Observatory - 3 years ago

Occasionally, white steam plume can be observed with a height of about 50-100 m above the crater. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Wind is moving Northeast..

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24th of January 2018, 3 years ago

2018-01-24 14:55:00 UTC Orange

Agung - 20180124/1455Z 

Anwar Sidiq, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 1437 UTC ( 2237 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 43738 FT (13254 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving East-North East.

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22nd of January 2018, 3 years ago

2018-01-22 19:33:00 UTC Orange

Agung - 20180122/1933Z 

Devy Kamil Syahbana, Dr., S.Si., Agung Volcano Observatory - 3 years ago

Eruption signals were recorded repeatedly at 1831 UTC (0231 localtime) for 65 seconds, at 1845 UTC (0245 localtime) for 92 seconds, at 1849 UTC (0249 localtime) for 404 seconds and at 1857 UTC (0257 localtime) for 121 seconds. Ash cloud is not visible due to thick fog coverage, however glow from the crater was observed at 1845 UTC (0245 localtime). Eruption is not continuing. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Wind is moving East-Southeast..

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19th of January 2018, 3 years ago

2018-01-19 11:34:00 UTC Orange

Agung - 20180119/1134Z 

Anwar Sidiq, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 1120 UTC (1920 local). Eruption and ash emission is not continuing. Bright glow from the crater was observed during the eruption. The eruption lasted for about 120 seconds. Best estimate of ash-cloud top is around 59578 FT (18054 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving East..

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17th of January 2018, 3 years ago

2018-01-17 13:51:00 UTC Orange

Agung - 20180117/1351Z 

Anwar Sidiq, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 1326 UTC ( 2126 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 49018 FT (14854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving East.

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14th of January 2018, 3 years ago

2018-01-14 23:42:00 UTC Orange

Agung - 20180114/2342Z 

Wahyu Ardi Setiawan, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 2323 UTC ( 0723 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 54298 FT (16454 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to North - Northeast.

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11th of January 2018, 3 years ago

2018-01-11 10:10:00 UTC Orange

Agung - 20180111/1010Z 

Wahyu Ardi Setiawan, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 0954 UTC ( 1754 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 59578 FT (18054 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to North - Northeast.

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8th of January 2018, 3 years ago

2018-01-08 15:43:00 UTC Orange

Agung - 20180108/1543Z 

Anwar Sidiq, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 1422 UTC ( 2222 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 54298 FT (16454 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southeast and east .

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2018-01-08 14:56:00 UTC Orange

Agung - 20180108/1456Z 

Anwar Sidiq, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 0302 UTC ( 1422 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 54298 FT (16454 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southeast and east.

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3rd of January 2018, 3 years ago

2018-01-03 03:33:00 UTC Orange

Agung - 20180103/0333Z 

Wahyu Ardi Setiawan, Agung Volcano Observatory - 3 years ago

Eruption with volcanic ash cloud at 0302 UTC ( 1102 local). Eruption and ash emission is not continuing Best estimate of ash-cloud top is around 49018 FT (14854 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest and south.

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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.