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
 

17th of July 2016, 4 years ago

2016-07-17 23:06:00 UTC Yellow

Dukono - 20160717/2306Z 

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

Eruption with volcanic ash cloud at 1608 UTC (0708 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 18259 FT (5533 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving west-southwest.

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16th of July 2016, 4 years ago

2016-07-16 21:52:00 UTC Orange

Dukono - 20160716/2152Z 

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

Eruption with ash cloud observed at 1930 UTC (0430 Local).Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 21427 FT (6493 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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2016-07-16 01:57:00 UTC Orange

Dukono - 20160716/0157Z 

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

Eruption with volcanic ash cloud observed at 1959 UTC (0459 Local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 23539 FT (7133 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Dark grey ash cloud moving west-north west.

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12th of July 2016, 4 years ago

2016-07-12 02:09:00 UTC Yellow

Bromo - 20160712/0209Z 

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

Eruption with volcanic ash clouds at 23:04 UTC (06:04 local time), and the ash still continue. Best estimate of ash-cloud top is around 33043 FT (10013 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud grey white to brown move to south-southeast and still continue..

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20th of June 2016, 4 years ago

2016-06-20 04:49:00 UTC Yellow

Anak Krakatau - 20160620/0449Z 

Martanto, S.T., Anak Krakatau Volcano Observatory - 4 years ago

Seismograph at Anak Krakatau Volcano Observatory detected an eruption occurred at 05:51 Local Time or 22:51 UTC, but the eruption was not observed visually from the observatory because of cloudy weather. The seismicity increased before the eruption, preceded by a swarm of volcanic earthquakes about 1 day before and significantly increased 3 hours before the eruption. After the eruption, seismic activity decreases gradually. 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. -.

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3rd of June 2016, 4 years ago

2016-06-03 08:39:00 UTC Orange

Kerinci - 20160603/0839Z 

David Adriansyah, S.T., Kerinci Volcano Observatory - 4 years ago

Eruption with volcanic ash cloud at 0135 UTC (0835 local) Best estimate of ash-cloud top is around 83424 FT (25280 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Brown-grey ash-cloud moving to east-northeast..

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29th of May 2016, 4 years ago

2016-05-29 01:12:00 UTC Orange

Sinabung - 20160529/0112Z 

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

Eruption with volcanic ash clouds at 06:30 UTC (13:30 local time). The eruption lasted for 257 seconds. Best estimate of ash-cloud top is around 104333 FT (31616 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to east.

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24th of May 2016, 4 years ago

2016-05-24 05:31:00 UTC Yellow

Bromo - 20160524/0531Z 

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

Eruption happened in 24/05/2016 06:17 WIB with brown ash, and presure low, cloud height about 900 meters above summit, and move to the east Best estimate of ash-cloud top is around 34099 FT (10333 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. ash cloud move to the east with low presure.

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4th of May 2016, 4 years ago

2016-05-04 07:26:00 UTC Orange

Kerinci - 20160504/0726Z 

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

Eruption with volcanic ashclouds at 0943 localtime or 0243 UTC Best estimate of ash-cloud top is around 48576 FT (14720 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud top is around 4600 meter above sea level, Ash-cloud moving west. Source of height data: ground observer..

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2nd of May 2016, 4 years ago

2016-05-02 03:25:00 UTC Orange

Dukono - 20160502/0325Z 

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

Eruption with grey-colored ash is observed. The eruption and ash emission is continuing. Best estimate of ash-cloud top is around 19925 FT (6038 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The volcanic ash is moving towards west direction..

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1st of May 2016, 4 years ago

2016-05-01 10:51:00 UTC Yellow

Gamalama - 20160501/1051Z 

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

Gamalama Volcano Observatory has detected a slight increase in volcanic tremor activity at Gamalama Volcano on Ternate Island in the North Maluku province. This increase is observed at least since 1 May 2016 00:30 UTC (09:30 local time). The recorded tremor amplitudes vary around 0.5-4.0 mm while the background is around 0.5-1.00mm. Therefore, the Aviation Color Code is set to YELLOW. There is no indication that an eruption is imminent or certain, although the potential for an eruption has increased. Gamalama Volcano Observatory will continue to monitor the volcano closely. 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. NILL.

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24th of April 2016, 4 years ago

2016-04-24 22:58:00 UTC Orange

Dukono - 20160424/2258Z 

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

Eruption with white-grey colored volcanic ash-cloud is observed on 24 April 2016 at 22:45 UTC (25 April 2016 at 07:45 UTC). Eruption is continuing. Best estimate of ash-cloud top is around 20981 FT (6358 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving to Southeast..

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23rd of April 2016, 4 years ago

2016-04-23 13:01:00 UTC Orange

Dukono - 20160423/1301Z 

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

Eruption with white-grey colored ash is clearly observed at 12:32 UTC. Eruption is still ongoing. Best estimate of ash-cloud top is around 21509 FT (6518 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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14th of April 2016, 4 years ago

2016-04-14 22:50:00 UTC Orange

Dukono - 20160414/2250Z 

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

Continuous eruption with volcanic ash cloud is observed on 14 April 2016 at 21:57 UTC (15 April 2016 06:57 localtime/UTC +9). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 18341 FT (5558 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey coloured ash-cloud is moving to the west-southwest..

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10th of April 2016, 4 years ago

2016-04-10 06:40:00 UTC Orange

Dukono - 20160410/0640Z 

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

Continuous eruption with white-grey coloured volcanic ash cloud is observed on 10 April 2016 at 05:58 UTC (14:58 local/UTC 9). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 22037 FT (6678 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud is moving to the northeast..

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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.