Archived
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
 

28th of September 2023, 1 day ago

2023-09-28 10:22:00 UTC Orange

Ibu - 20230928/1022Z

Ahmad Basuki, S.Si, M.Si., Ibu Volcano Observatory - 8 hours ago

Eruption with volcanic ash cloud at 1022 UTC (1922 local). Best estimate of ash-cloud top is around 6800 FT (2125 M) above sea level or 2560 FT (800 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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2023-09-28 01:03:00 UTC Orange

Ili Lewotolok - 20230928/0103Z

Yeremias Kristianto Pugel, A.Md., Ili Lewotolok Volcano Observatory - 17 hours ago

Eruption with volcanic ash cloud at 0103 UTC (0903 local). Best estimate of ash-cloud top is around 6474 FT (2023 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..

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2023-09-28 00:34:00 UTC Orange

Semeru - 20230928/0034Z

Ghufron Alwi, Semeru Volcano Observatory - 18 hours ago

Eruption with volcanic ash cloud at 0034 UTC (0734 local). Best estimate of ash-cloud top is around 14323 FT (4476 M) above sea level or 2560 FT (800 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from southwest to west. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..

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27th of September 2023, 2 days ago

2023-09-27 23:39:00 UTC Orange

Semeru - 20230927/2339Z

Ghufron Alwi, Semeru Volcano Observatory - 19 hours ago

Eruption with volcanic ash cloud at 2339 UTC (0639 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from southwest to west. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed from medium to thick..

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2023-09-27 02:28:00 UTC Orange

Semeru - 20230927/0228Z

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 day ago

Eruption with volcanic ash cloud at 0228 UTC (0928 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from south to southwest. Volcanic ash is observed to be gray to brown. The intensity of volcanic ash is observed to be thick..

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2023-09-27 01:50:00 UTC Orange

Semeru - 20230927/0150Z

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 day ago

Eruption with volcanic ash cloud at 0150 UTC (0850 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from southwest to west. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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2023-09-27 00:35:00 UTC Orange

Semeru - 20230927/0035Z

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 1 day ago

Eruption with volcanic ash cloud at 0035 UTC (0735 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from south to southwest. Volcanic ash is observed to be gray to brown. The intensity of volcanic ash is observed from medium to thick..

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26th of September 2023, 3 days ago

2023-09-26 02:28:00 UTC Orange

Semeru - 20230926/0228Z

Sigit Rian Alfian, Semeru Volcano Observatory - 2 days ago

Eruption with volcanic ash cloud at 0228 UTC (0928 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..

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2023-09-26 01:10:00 UTC Orange

Semeru - 20230926/0110Z

Yadi Yuliandi, A.Md., Semeru Volcano Observatory - 2 days ago

Eruption with volcanic ash cloud at 0110 UTC (0810 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed from medium to thick..

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25th of September 2023, 4 days ago

2023-09-25 13:26:00 UTC Orange

Ibu - 20230925/1326Z

Ahmad Basuki, S.Si, M.Si., Ibu Volcano Observatory - 3 days ago

Eruption with volcanic ash cloud at 1326 UTC (2226 local). Best estimate of ash-cloud top is around 7440 FT (2325 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..

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2023-09-25 07:15:00 UTC Orange

Semeru - 20230925/0715Z

Sigit Rian Alfian, Semeru Volcano Observatory - 3 days ago

Eruption with volcanic ash cloud at 0715 UTC (1415 local). Best estimate of ash-cloud top is around 14323 FT (4476 M) above sea level or 2560 FT (800 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..

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2023-09-25 05:56:00 UTC Orange

Semeru - 20230925/0556Z

Sigit Rian Alfian, Semeru Volcano Observatory - 3 days ago

Eruption with volcanic ash cloud at 0556 UTC (1256 local). Best estimate of ash-cloud top is around 14323 FT (4476 M) above sea level or 2560 FT (800 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..

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2023-09-25 03:42:00 UTC Orange

Semeru - 20230925/0342Z

Ghufron Alwi, Semeru Volcano Observatory - 3 days ago

Eruption with volcanic ash cloud at 0342 UTC (1042 local). Best estimate of ash-cloud top is around 14963 FT (4676 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be white to dark. The intensity of volcanic ash is observed from medium to thick..

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2023-09-25 02:58:00 UTC Orange

Semeru - 20230925/0258Z

Ghufron Alwi, Semeru Volcano Observatory - 3 days ago

Eruption with volcanic ash cloud at 0258 UTC (0958 local). Best estimate of ash-cloud top is around 14963 FT (4676 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be white to brown. The intensity of volcanic ash is observed from medium to thick..

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2023-09-25 02:02:00 UTC Orange

Semeru - 20230925/0202Z

Ghufron Alwi, Semeru Volcano Observatory - 3 days ago

Eruption with volcanic ash cloud at 0202 UTC (0902 local). Best estimate of ash-cloud top is around 14963 FT (4676 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be white to brown. The intensity of volcanic ash is observed from medium to thick..

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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.