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

24th of September 2023, 5 days ago


Semeru - 20230924/2355Z

Ghufron Alwi, 3 days ago

Eruption with volcanic ash cloud at 2355 UTC (0655 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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Ibu - 20230924/2212Z

Ahmad Basuki, S.Si, M.Si., 3 days ago VEN

Eruption with volcanic ash cloud at 2212 UTC (0712 local). Best estimate of ash-cloud top is around 9040 FT (2825 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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Ili Lewotolok - 20230924/0839Z

Yeremias Kristianto Pugel, A.Md., 4 days ago VEN

Eruption with volcanic ash cloud at 0839 UTC (1639 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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23rd of September 2023, 6 days ago


Ibu - 20230923/1436Z

Ahmad Basuki, S.Si, M.Si., 5 days ago VEN

Eruption with volcanic ash cloud at 1436 UTC (2336 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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Ili Lewotolok - 20230923/0204Z

Fajaruddin M. Balido, 5 days ago VEN

Eruption with volcanic ash cloud at 0204 UTC (1004 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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22nd of September 2023, 1 week ago


Semeru - 20230922/0223Z

Yadi Yuliandi, A.Md., 6 days ago

Eruption with volcanic ash cloud at 0223 UTC (0923 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 - 20230922/0223Z

Yadi Yuliandi, A.Md., 6 days ago VEN

Eruption with volcanic ash cloud at 0223 UTC (0923 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 - 20230922/0141Z

Yadi Yuliandi, A.Md., 6 days ago

Eruption with volcanic ash cloud at 0141 UTC (0841 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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21st of September 2023, 1 week ago


Semeru - 20230921/2248Z

Ghufron Alwi, 6 days ago

Eruption with volcanic ash cloud at 2248 UTC (0548 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.

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Semeru - 20230921/0234Z

Sigit Rian Alfian, 1 week ago

Eruption with volcanic ash cloud at 0234 UTC (0934 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 - 20230921/0234Z

Sigit Rian Alfian, 1 week ago VEN

Eruption with volcanic ash cloud at 0234 UTC (0934 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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Ili Lewotolok - 20230921/0055Z

Stanislaus Ara Kian, A.Md., 1 week ago VEN

Eruption with volcanic ash cloud at 0055 UTC (0855 local). Best estimate of ash-cloud top is around 6794 FT (2123 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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20th of September 2023, 1 week ago


Semeru - 20230920/2330Z

Yadi Yuliandi, A.Md., 1 week ago VEN

Eruption with volcanic ash cloud at 2330 UTC (0630 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 - 20230920/2303Z

Yadi Yuliandi, A.Md., 1 week ago VEN

Eruption with volcanic ash cloud at 2303 UTC (0603 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 - 20230920/2242Z

Yadi Yuliandi, A.Md., 1 week ago

Eruption with volcanic ash cloud at 2242 UTC (0542 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