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
 

2nd of October 2016, 4 years ago

2016-10-02 22:57:00 UTC Orange

Dukono - 20161002/2257Z 

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

Eruption with ash cloud observed at 1543 UTC (0643 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 17203 FT (5213 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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1st of October 2016, 4 years ago

2016-10-01 22:15:00 UTC Yellow

Dukono - 20161001/2215Z 

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

Eruption with ash cloud observed at 1603 UTC (0703 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 to east.

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30th of September 2016, 4 years ago

2016-09-30 23:03:00 UTC Orange

Dukono - 20160930/2303Z 

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

Eruption with ash cloud at 1600 UTC ( 0700 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 south..

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29th of September 2016, 4 years ago

2016-09-29 07:35:00 UTC Yellow

Lokon - 20160929/0735Z 

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

Lokon Volcano Observatory has detected an increase in volcanic activity at Lokon Volcano, Tomohon, North Sulawesi province. This increase is observed in the past 24 hours. Therefore, the Aviation Color Code is set to YELLOW. There is no indication that an eruption is imminent or certain, however the potential for an eruption is increased. Lokon 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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27th of September 2016, 4 years ago

2016-09-27 09:26:00 UTC Orange

Rinjani - 20160927/0926Z 

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

Eruption with volcanic ash cloud at 07:45 UTC (14:45 local time). Best estimate of ash-cloud top is around 60466 FT (18323 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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17th of September 2016, 4 years ago

2016-09-17 22:42:00 UTC Orange

Dukono - 20160917/2242Z 

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

Eruption with ash cloud observed at 1535 UTC (0635 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 19315 FT (5853 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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6th of September 2016, 4 years ago

2016-09-06 00:53:00 UTC Orange

Dukono - 20160906/0053Z 

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

Eruption with ash cloud observed at 1615 UTC (0715 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. ash cloud moving to west-northwest.

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1st of September 2016, 4 years ago

2016-09-01 23:40:00 UTC Red

Dukono - 20160901/2340Z 

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

Eruption with ash cloud observed at 1725 UTC (0825 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. Ash cloud is moving to south.

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30th of August 2016, 4 years ago

2016-08-30 22:50:00 UTC Orange

Dukono - 20160830/2250Z 

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

Eruption with ash cloud observed at 1635 UTC (0735 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west.

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19th of August 2016, 4 years ago

2016-08-19 00:22:00 UTC Orange

Dukono - 20160819/0022Z 

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

Eruption with ash cloud observed at 1637 UTC (0737 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 20371 FT (6173 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south.

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14th of August 2016, 4 years ago

2016-08-14 21:40:00 UTC Orange

Dukono - 20160814/2140Z 

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

Eruption with ash cloud observed at 1530 UTC (0630 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 20371 FT (6173 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north and east..

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13th of August 2016, 4 years ago

2016-08-13 23:12:00 UTC Orange

Dukono - 20160813/2312Z 

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

Eruption with ash cloud observed at 1640 UTC (0740 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 19315 FT (5853 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north..

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12th of August 2016, 4 years ago

2016-08-12 23:28:00 UTC Orange

Dukono - 20160812/2328Z 

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

Eruption with ash cloud observed at 1541 UTC (0641 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 19315 FT (5853 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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11th of August 2016, 4 years ago

2016-08-11 23:39:00 UTC Orange

Dukono - 20160811/2339Z 

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

Eruption with ash cloud observed at 1721 UTC (0821 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 north-northeast. Ash fell reaches 11 km from the crater..

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10th of August 2016, 4 years ago

2016-08-10 22:51:00 UTC Orange

Dukono - 20160810/2251Z 

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

Eruption with ash cloud observed at 1522 UTC (0622 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 northeast. Thin ash fell at some villages around 11 km distance from the crater..

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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.