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

5th of December 2022, 2 months ago


Semeru - 20221205/2203Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 2203 UTC (0503 local). Best estimate of ash-cloud top is around 13043 FT (4076 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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4th of December 2022, 2 months ago


Semeru - 20221204/2255Z

Mukdas Sofian, A.Md., 2 months ago

Eruption with volcanic ash cloud at 2255 UTC (0555 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 - 20221204/1150Z

Oktory Prambada, S.T., M.Sc, 2 months ago

Increasing in volcanic activity. Ash-cloud is not observed.

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Semeru - 20221204/0445Z

Liswanto, A.P., 2 months ago

Eruption at 0445 UTC (1145 local). Ash-cloud is not observed.

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Semeru - 20221204/0218Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 0218 UTC (0918 local). Best estimate of ash-cloud top is around 27763 FT (8676 M) above sea level or 16000 FT (5000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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3rd of December 2022, 2 months ago


Semeru - 20221203/2111Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 2111 UTC (0411 local). Best estimate of ash-cloud top is around 16563 FT (5176 M) above sea level or 4800 FT (1500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.

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2nd of December 2022, 2 months ago


Semeru - 20221202/2220Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 2220 UTC (0520 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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1st of December 2022, 2 months ago


Semeru - 20221201/2214Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 2214 UTC (0514 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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Semeru - 20221201/0007Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 0007 UTC (0707 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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29th of November 2022, 2 months ago


Semeru - 20221129/2243Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 2243 UTC (0543 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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28th of November 2022, 2 months ago


Semeru - 20221128/2209Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 2209 UTC (0509 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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27th of November 2022, 2 months ago


Semeru - 20221127/2311Z

Yadi Yuliandi, A.Md., 2 months ago

Eruption with volcanic ash cloud at 2311 UTC (0611 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 - 20221127/2256Z

Yadi Yuliandi, A.Md., 2 months ago

Eruption with volcanic ash cloud at 2256 UTC (0556 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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26th of November 2022, 2 months ago


Semeru - 20221126/2252Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 2252 UTC (0552 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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24th of November 2022, 2 months ago


Semeru - 20221124/2207Z

Liswanto, A.P., 2 months ago

Eruption with volcanic ash cloud at 2207 UTC (0507 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