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
 

12th of February 2020, 2 weeks ago

2020-02-12 22:43:00 UTC Orange

Merapi - 20200212/2243Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 2216 UTC (0516 local). The eruption lasted for 105 seconds Best estimate of ash-cloud top is around 15898 FT (4968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northwest. .

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17th of November 2019, 3 months ago

2019-11-17 03:54:00 UTC Orange

Merapi - 20191117/0354Z 

Yulianto, Merapi Volcano Observatory - 3 months ago

Eruption with ash cloud at 0346 UTC (1046 local), lasted for 155 seconds. Eruption has stopped. Best estimate of ash-cloud top is around 12698 FT (3968 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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8th of November 2019, 3 months ago

2019-11-08 23:43:00 UTC Orange

Merapi - 20191108/2343Z 

Alzwar Nurmanaji, A.Md, Merapi Volcano Observatory - 3 months ago

Eruption with ash cloud at 2321 UTC (0621 local), lasted for 3 minutes. Eruption has stopped. Best estimate of ash-cloud top is around 14298 FT (4468 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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14th of October 2019, 4 months ago

2019-10-14 09:44:00 UTC Orange

Merapi - 20191014/0944Z 

Niken Angga Rukmini, S.T., Merapi Volcano Observatory - 4 months ago

Eruption with ash cloud at 0931 UTC (1631 local), lasted for 4 minutes. Eruption has stopped. Best estimate of ash-cloud top is around 19098 FT (5968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Pyroclastic flow moving to southwest..

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22nd of September 2019, 5 months ago

2019-09-22 05:08:00 UTC Orange

Merapi - 20190922/0508Z 

Niken Angga Rukmini, S.T., Merapi Volcano Observatory - 5 months ago

Small eruption with volcanic ash cloud at 0436 UTC (1136 local). Eruption has stopped. Best estimate of ash-cloud top is around 12058 FT (3768 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud movement is not observed..

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1st of June 2018, 1 year ago

2018-06-01 01:31:00 UTC Red

Merapi - 20180601/0131Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 01:20 UTC (08.20 local). Eruption has deceased Best estimate of ash-cloud top is around 94703 FT (28698 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north west..

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2018-06-01 13:32:00 UTC Orange

Merapi - 20180601/1332Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 13:24 UTC (20.24 local). Eruption has deceased Best estimate of ash-cloud top is around 57743 FT (17498 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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2018-06-01 14:07:00 UTC Orange

Merapi - 20180601/1407Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 14:00 UTC (21.00 local). Eruption has deceased Best estimate of ash-cloud top is around 41903 FT (12698 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north west.

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3rd of June 2018, 1 year ago

2018-06-03 13:39:00 UTC Green

Merapi - 20180603/1339Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 1 year ago

No eruption occurred after the last eruption on 01 June 2018 at 14:00 UTC Best estimate of ash-cloud top is around 39791 FT (12058 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White volcanic plume with low pressure and intensity.

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25th of May 2018, 1 year ago

2018-05-25 21:34:00 UTC Green

Merapi - 20180525/2134Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 1 year ago

No eruption occurred after the last eruption on 24 May 2018 at 0348 UTC Best estimate of ash-cloud top is around 31607 FT (9578 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White volcanic plume with low pressure and intensity.

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24th of May 2018, 1 year ago

2018-05-24 03:57:00 UTC Orange

Merapi - 20180524/0357Z 

Niken Angga Rukmini, S.T., Merapi Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 0348 UTC (1048 local). Eruption has deceased. Best estimate of ash-cloud top is around 47183 FT (14298 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. -.

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23rd of May 2018, 1 year ago

2018-05-23 20:16:00 UTC Red

Merapi - 20180523/2016Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 19:56 UTC (02.56 local). Eruption has deceased Best estimate of ash-cloud top is around 94703 FT (28698 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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2018-05-23 08:32:00 UTC Orange

Merapi - 20180523/0832Z 

Niken Angga Rukmini, S.T., Merapi Volcano Observatory - 1 year ago

Eruption at 0649 UTC (1349 local). Eruption has deceased. 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 moving to south-west..

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22nd of May 2018, 1 year ago

2018-05-22 21:28:00 UTC Orange

Merapi - 20180522/2128Z 

Sulistiyani, S.Si., Merapi Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 2031 UTC (0331 local). Not continuing. Best estimate of ash-cloud top is around 52463 FT (15898 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south-west.

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2018-05-22 10:22:00 UTC Green

Merapi - 20180522/1022Z 

Dr. Agus Budi Santoso, S.Si., M.Sc., Merapi Volcano Observatory - 1 year ago

No eruption occurred after the last eruption on 21 May 2018 at 1847 UTC Best estimate of ash-cloud top is around 31607 FT (9578 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White volcanic plume with low pressure and intensity.

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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.