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

20th of January 2023, 2 weeks ago


Semeru - 20230120/2315Z

Liswanto, A.P., 2 weeks ago

Eruption with volcanic ash cloud at 2315 UTC (0615 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.

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Semeru - 20230120/2248Z

Mukdas Sofian, A.Md., 2 weeks ago VEN

Eruption with volcanic ash cloud at 2248 UTC (0548 local). Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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19th of January 2023, 2 weeks ago


Semeru - 20230119/2349Z

Mukdas Sofian, A.Md., 2 weeks ago VEN

Eruption with volcanic ash cloud at 2349 UTC (0649 local). Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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18th of January 2023, 2 weeks ago


Semeru - 20230118/2328Z

Ghufron Alwi, 2 weeks ago VEN

Eruption with volcanic ash cloud at 2328 UTC (0628 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.

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Semeru - 20230118/2207Z

Liswanto, A.P., 2 weeks ago

Eruption with volcanic ash cloud at 2207 UTC (0507 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.

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Ili Lewotolok - 20230118/1833Z

Fajaruddin M. Balido, 2 weeks ago VEN

Eruption with volcanic ash cloud at 1833 UTC (0233 local). Best estimate of ash-cloud top is around 5834 FT (1823 M) above sea level or 1280 FT (400 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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17th of January 2023, 3 weeks ago


Semeru - 20230117/2248Z

Mukdas Sofian, A.Md., 2 weeks ago VEN

Eruption with volcanic ash cloud at 2248 UTC (0548 local). Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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Ili Lewotolok - 20230117/1352Z

Yeremias Kristianto Pugel, A.Md., 2 weeks ago VEN

Eruption with volcanic ash cloud at 1352 UTC (2152 local). Best estimate of ash-cloud top is around 6154 FT (1923 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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16th of January 2023, 3 weeks ago


Semeru - 20230116/2317Z

Mukdas Sofian, A.Md., 3 weeks ago VEN

Eruption with volcanic ash cloud at 2317 UTC (0617 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.

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Semeru - 20230116/2236Z

Ghufron Alwi, 3 weeks ago VEN

Eruption with volcanic ash cloud at 2236 UTC (0536 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.

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Semeru - 20230116/2209Z

Ghufron Alwi, 3 weeks ago VEN

Eruption with volcanic ash cloud at 2209 UTC (0509 local). Best estimate of ash-cloud top is around 14003 FT (4376 M) above sea level or 2240 FT (700 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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Ili Lewotolok - 20230116/1255Z

Syawaludin, A.Md., 3 weeks ago VEN

Eruption at 1255 UTC (2055 local). Ash-cloud is not observed.

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Ibu - 20230116/1059Z

Axl Roeroe, 3 weeks ago VEN

Eruption with volcanic ash cloud at 1059 UTC (1959 local). Best estimate of ash-cloud top is around 6160 FT (1925 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.

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Semeru - 20230116/0955Z

Yadi Yuliandi, A.Md., 3 weeks ago VEN

Eruption with volcanic ash cloud at 0955 UTC (1655 local). Best estimate of ash-cloud top is around 14003 FT (4376 M) above sea level or 2240 FT (700 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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Semeru - 20230116/0927Z

Yadi Yuliandi, A.Md., 3 weeks ago

Eruption with volcanic ash cloud at 0927 UTC (1627 local). Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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VONA Color Code
Green

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.


Yellow

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.


Orange

Volcano is exhibiting heightened unrest with increased likelihood of eruption with column height below 6000 meter above sea level.


Red

Eruption is forecast to be imminent with significant emission of ash with column height above 6000 meter above sea level.

Archived

Old Vona