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
 

27th of September 2015, 4 years ago

2015-09-27 02:38:00 UTC Red

Sinabung - 20150927/0238Z 

Martanto, S.T., Sinabung Volcano Observatory - 4 years ago

Sinabung erupted on Sunday, September 27, 2015, 02:38 UTC (10:38 WIB ) and had duration of 296 seconds. Eruption column reached 2500 m in altitude above crater . Gas emission is continuing with plume height less than 500 m. Further reports will be issued as more information becomes available. Best estimate of ash-cloud top is around 51955 FT (15744 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The pyroclastic flow reached a distance of 3000 m from the southern crater to east – southeast slope of Sinabung volcano.

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2015-09-27 02:38:00 UTC Yellow

Sinabung - 20150927/0238Z 

Martanto, S.T., Sinabung Volcano Observatory - 4 years ago

Sinabung erupted on Sunday, September 27, 2015, 02:38 UTC (09:38 WIB ) and had duration of 296 seconds. Eruption column reached 2500 m in altitude above crater . Gas emission is continuing with plume height less than 500 m. Further reports will be issued as more information becomes available. Best estimate of ash-cloud top is around 51955 FT (15744 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The pyroclastic flow reached a distance of 3000 m from the southern crater to east - southeast slope of Sinabung volcano..

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20th of September 2015, 4 years ago

2015-09-20 16:56:00 UTC Red

Sinabung - 20150920/1656Z 

Martanto, S.T., Sinabung Volcano Observatory - 4 years ago

Sinabung erupted on Sunday, September 20, 2015, 16:56 UTC (23:56 WIB ) and had duration of 331 seconds. Eruption column reached 2000 m in altitude above crater . Gas emission and avalanche is continuing with plume height less than 1000 m. Further reports will be issued as more information becomes available. Best estimate of ash-cloud top is around 47098 FT (14272 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The pyroclastic flow reached a distance of 3500 mm from the southern crater to east – southeast slope of Sinabung volcano..

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2015-09-20 14:17:00 UTC Red

Sinabung - 20150920/1417Z 

Martanto, S.T., Sinabung Volcano Observatory - 4 years ago

Eruption column reached 4500 m in altitude above crater . Gas emission and avalanche is continuing with plume height less than 1000 m. Further reports will be issued as more information becomes available. Best estimate of ash-cloud top is around 73498 FT (22272 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The pyroclastic flow to the southern crater to west – southwest slope of Sinabung volcano..

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18th of September 2015, 4 years ago

2015-09-18 15:25:00 UTC Red

Sinabung - 20150918/1525Z 

Martanto, S.T., Sinabung Volcano Observatory - 4 years ago

Eruption of Sinabung at friday, September 18, 2015, 05:59 UTC (12:59 WIB). Gas emission and avalanche is continuing with plume height less than 1000 m. Best estimate of ash-cloud top is around 59770 FT (18112 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The Pyroclastic flow reaches a distance of 3 km from the southern crater to south east - east slope of Sinabung volcano..

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9th of September 2015, 4 years ago

2015-09-09 05:25:00 UTC Red

Sinabung - 20150909/0525Z 

Martanto, S.T., Sinabung Volcano Observatory - 4 years ago

Ash eruption of Sinabung Volcano at Wenesday, September 09, 2015, 0019 UTC (0719 WIB). Ash emmision is still continuing. Best estimate of ash-cloud top is around 47098 FT (14272 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Direction of the wind slowly to east - southwest. Color grey eruption coulomn..

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4th of September 2015, 4 years ago

2015-09-04 15:25:00 UTC Red

Sinabung - 20150904/1525Z 

Martanto, S.T., Sinabung Volcano Observatory - 4 years ago

Pyroclastic flow eruption of Sinabung Volcano at Friday, September 04, 2015, 1235 UTC (1935 WIB) and 1245 UTC (1945 WIB).Steam emmision is continuing. Best estimate of ash-cloud top is around 57658 FT (17472 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Pyroclastic flow (ash and hot gases) travel along south flank..

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2nd of September 2015, 4 years ago

2015-09-02 13:15:00 UTC Red

Sinabung - 20150902/1315Z 

Martanto, S.T., Sinabung Volcano Observatory - 4 years ago

Pyroclastic flow eruption of Sinabung Volcano at Wednesday, September 02, 2015, 1207 UTC (1907 WIB). Steam emmision is continuing. Best estimate of ash-cloud top is around 47098 FT (14272 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Pyroclastic flow (ash and hot gases) travel along south-southeast flank..

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31st of August 2015, 4 years ago

2015-08-31 03:18:00 UTC Red

Sinabung - 20150831/0318Z 

Martanto, S.T., Sinabung Volcano Observatory - 4 years ago

Pyroclastic flow eruption of Sinabung Volcano at Saturday, 29 August 2015, 1344 UTC (2044 WIB). Plume drifting to south-southeast. Steam emmision is continuing. Best estimate of ash-cloud top is around 41818 FT (12672 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Pyroclastic flow (ash and hot gases) travel along south-southeast flank..

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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.