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
 

3rd of April 2016, 4 years ago

2016-04-03 04:07:00 UTC Yellow

Bromo - 20160403/0407Z 

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

Eruption with vulconic ash above 600M from summit or 2929m above sea level and the ash still contuinue Best estimate of ash-cloud top is around 30931 FT (9373 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 south west.

View
 

2nd of April 2016, 4 years ago

2016-04-02 04:45:00 UTC Yellow

Bromo - 20160402/0445Z 

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

High steam emissions (with sometimes contains ash material, although not everday) 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. high steam emissions with sometimes contains ash material, although not everday..

View
2016-04-02 04:19:00 UTC Yellow

Bromo - 20160402/0419Z 

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

Steam emission with sometimes ash material detected at 0110 UTC (0810 local). Eruption and ash emission is continuing. 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 colored white - dark grey moving toward southwest..

View
 

30th of March 2016, 4 years ago

2016-03-30 00:42:00 UTC Yellow

Kerinci - 20160330/0042Z 

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

Eruption with volcanic ash cloud at 1027 UTC (1727 local). Eruption and ash emission is continuing. 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 moving eastward; may be higher than what can be observed clearly..

View
 

28th of March 2016, 4 years ago

2016-03-28 06:15:00 UTC Yellow

Kerinci - 20160328/0615Z 

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

Eruption with volcanic ash cloud at 0420 UTC (1220 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 46464 FT (14080 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving westward; may be higher than what can be observed clearly..

View
 

17th of February 2016, 4 years ago

2016-02-17 03:00:00 UTC Yellow

Merapi - 20160217/0300Z 

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

Eruption has ceased. Volcanic activity has decreased significantly. 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. Ash-cloud has dissipated..

View
 

16th of February 2016, 4 years ago

2016-02-16 23:45:00 UTC Red

Merapi - 20160216/2345Z 

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

Eruption with volcanic ash-cloud at 2335 UTC (0835 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 81312 FT (24640 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Large ash-cloud moving to northeast..

View
 

4th of January 2016, 4 years ago

2016-01-04 10:00:00 UTC Yellow

Soputan - 20160104/1000Z 

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

Eruption with volcanic ash cloud at 1253 UTC (2053 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 39956 FT (12108 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southeast..

View
 

4th of November 2015, 4 years ago

2015-11-04 04:00:00 UTC Orange

Rinjani - 20151104/0400Z 

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

Best estimate of ash-cloud top is around 14500 FT (4400 M) above sea level. Source of height data: ground observer. Eruption with volcanic ash cloud at 0050 UTC (0850 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 85810 FT (26003 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west-southwest; may be higher than what can be observed clearly..

View
 

27th of September 2015, 5 years ago

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

Sinabung - 20150927/0238Z 

Martanto, S.T., Sinabung Volcano Observatory - 5 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.

View
 

20th of September 2015, 5 years ago

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

Sinabung - 20150920/1656Z 

Martanto, S.T., Sinabung Volcano Observatory - 5 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..

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

Sinabung - 20150920/1417Z 

Martanto, S.T., Sinabung Volcano Observatory - 5 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..

View
 

18th of September 2015, 5 years ago

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

Sinabung - 20150918/1525Z 

Martanto, S.T., Sinabung Volcano Observatory - 5 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..

View
 

9th of September 2015, 5 years ago

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

Sinabung - 20150909/0525Z 

Martanto, S.T., Sinabung Volcano Observatory - 5 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..

View
 

4th of September 2015, 5 years ago

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

Sinabung - 20150904/1525Z 

Martanto, S.T., Sinabung Volcano Observatory - 5 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..

View
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.