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 September 2017, 4 years ago

2017-09-26 10:44:00 UTC Orange

Agung - 20170926/1044Z 

Oktory Prambada, S.T., M.Sc, Agung Volcano Observatory - 4 years ago

Low pressure white plume, likely dominated by water vapor, is observed emitting continuously from the main crater at1027 UTC (0527 Central Indonesia Time). 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. Plume is observed emitting continuously from the main crater and reached an altitude of approximately 500 m and moving Northeast.

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22nd of September 2017, 4 years ago

2017-09-22 01:17:00 UTC Yellow

Agung - 20170922/0117Z 

Oktory Prambada, S.T., M.Sc, Agung Volcano Observatory - 4 years ago

White smoke dominated with water content at 0045 UTC (0845 Central Indonesia Time). Best estimate of ash-cloud top is around 67416 FT (20429 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White smoke moving to northwest.

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19th of September 2017, 4 years ago

2017-09-19 03:24:00 UTC Yellow

Agung - 20170919/0324Z 

Oktory Prambada, S.T., M.Sc, Agung Volcano Observatory - 4 years ago

Volcanic ash cloud at 0255 UTC (1055 Central Indonesia Time). Best estimate of ash-cloud top is around 35290 FT (10694 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White dense volcanic ash moving to West.

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18th of September 2017, 4 years ago

2017-09-18 13:15:00 UTC Yellow

Agung - 20170918/1315Z 

Oktory Prambada, S.T., M.Sc, Agung Volcano Observatory - 4 years ago

Volcanic earthquake increasing rapidly with small hotspot detected and felt earthquake II-III MMI at 0002UTC (1902 Central Indonesian Time). 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. Light gas emission from active solfatara in the Agung Crater..

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15th of September 2017, 4 years ago

2017-09-15 02:00:00 UTC Yellow

Agung - 20170915/0200Z 

Oktory Prambada, S.T., M.Sc, Agung Volcano Observatory - 4 years ago

Light gas emission from active solfatara in the Agung Crater at 0150 UTC (0850 local) 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. no ash material was ejected, only light smoke from active solfatra.

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14th of September 2017, 4 years ago

2017-09-14 12:31:00 UTC Yellow

Agung - 20170914/1231Z 

Oktory Prambada, S.T., M.Sc, Agung Volcano Observatory - 4 years ago

Volcanic and Tectonic earthquake increasing since August 10, 2017. Base on observation in Sept, 13 2017, solfatara with light smoke seen from the bottom of the crater. The solfatara was not present on previous observation on April 2017. 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. No eruption observed.

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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.