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
 

14th of November 2019, 8 months ago

2019-11-14 02:33:00 UTC Yellow

Sangeangapi - 20191114/0233Z 

Aditya Sebastian Andreas, S.Si., M.Si., Sangeangapi Volcano Observatory - 8 months ago

Small gas emission observed at 0145 UTC (0945 local). Best estimate of ash-cloud top is around 6397 FT (1999 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Thin and white emission moving to west..

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15th of October 2018, 1 year ago

2018-10-15 08:13:00 UTC Orange

Sangeangapi - 20181015/0813Z 

Oktory Prambada, S.T., M.Sc, Sangeangapi Volcano Observatory - 1 year ago

Ash Emission with volcanic ash cloud at 0538 UTC (1338 local) and is continuing Best estimate of ash-cloud top is around 7037 FT (2199 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west - northwest-southwest.

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9th of May 2018, 2 years ago

2018-05-09 10:31:00 UTC Yellow

Sangeangapi - 20180509/1031Z 

Aditya Sebastian Andreas, S.Si., M.Si., Sangeangapi Volcano Observatory - 2 years ago

Gas emission plume was observed at 1007 UTC (1807 LT) Best estimate of ash-cloud top is around 43804 FT (13274 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The plume is moving to west..

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2018-05-09 10:25:00 UTC Yellow

Sangeangapi - 20180509/1025Z 

Oktory Prambada, S.T., M.Sc, Sangeangapi Volcano Observatory - 2 years ago

Volcanic ash cloud at 9.07 UTC (18.07 local). Ash emission is 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. White-Grey Volcanic ash moving vertical from the vent..

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19th of July 2017, 2 years ago

2017-07-19 09:08:00 UTC Orange

Sangeangapi - 20170719/0908Z 

Martanto, S.T., Sangeangapi Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at UTC 0758 (1558 local) Best estimate of ash-cloud top is around 27974 FT (8477 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to northwest..

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16th of July 2017, 2 years ago

2017-07-16 10:18:00 UTC Orange

Sangeangapi - 20170716/1018Z 

Aditya Sebastian Andreas, S.Si., M.Si., Sangeangapi Volcano Observatory - 2 years ago

Gas and ash emission was observed at 0942 UTC (1742 LT). Best estimate of ash-cloud top is around 23222 FT (7037 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to north .

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15th of July 2017, 3 years ago

2017-07-15 04:49:00 UTC Orange

Sangeangapi - 20170715/0449Z 

Aditya Sebastian Andreas, S.Si., M.Si., Sangeangapi Volcano Observatory - 3 years ago

Small eruption with ash emission 100-200 m above summit at 03:54 UTC (11:54 LT). Best estimate of ash-cloud top is around 22694 FT (6877 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash moving to southwest.

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17th of May 2017, 3 years ago

2017-05-17 09:35:00 UTC Yellow

Sangeangapi - 20170517/0935Z 

Martanto, S.T., Sangeangapi Volcano Observatory - 3 years ago

Steam gas with white color has observed from the observatory. Best estimate of ash-cloud top is around 22166 FT (6717 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Steam gas emission continuing to southwest. With very weak pressure..

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11th of January 2017, 3 years ago

2017-01-11 01:23:00 UTC Yellow

Sangeangapi - 20170111/0123Z 

Oktory Prambada, S.T., M.Sc, Sangeangapi Volcano Observatory - 3 years ago

Gas emission at 12.19 AM UTC (08.19 AM local). Gas emission is continuing. Best estimate of ash-cloud top is around 64911 FT (19670 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Gas emission moving to east.

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2017-01-11 01:08:00 UTC Green

Sangeangapi - 20170111/0108Z 

Oktory Prambada, S.T., M.Sc, Sangeangapi Volcano Observatory - 3 years ago

Gas emission at January 11, 2017, 01.02 am UTC ( January 11, 2017, 09.02 pm) Best estimate of ash-cloud top is around 23750 FT (7197 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. gas emission moving to the east.

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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.