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
 

17th of April 2020, 5 months ago

2020-04-17 10:51:00 UTC Orange

Anak Krakatau - 20200417/1051Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 1032 UTC (1732 local). Ash-cloud not visible. Anak Krakatau volcano is not clear..

View
2020-04-17 00:58:00 UTC Orange

Anak Krakatau - 20200417/0058Z 

Bagus Puguh Wibowo, A.Md., Anak Krakatau Volcano Observatory - 5 months ago

Eruption with ash clouds at 00:49 UTC (07:49 local time). The eruption lasted for 50 seconds. Best estimate of ash-cloud top is around 662 FT (207 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick gray eruption smoke 50m from the top of the volcano, the wind direction slowly to the south west..

View
 

16th of April 2020, 5 months ago

2020-04-16 08:40:00 UTC Orange

Anak Krakatau - 20200416/0840Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 0747 UTC (1447 local). Ash-cloud not visible. Anak Krakatau volcano is not clear..

View
 

13th of April 2020, 5 months ago

2020-04-13 23:41:00 UTC Orange

Anak Krakatau - 20200413/2341Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 5 months ago

Eruption with volcanic ash cloud at 2328 UTC (0628 local). Ash-cloud not visible. Anak Krakatau volcano is not clear..

View
2020-04-13 14:02:00 UTC Orange

Anak Krakatau - 20200413/1402Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 5 months ago

Recorded eruption at 13:54 UTC (20:54 local time) Ash-cloud not visible. Anak Krakatau volcano is not clear.

View
 

11th of April 2020, 5 months ago

2020-04-11 11:14:00 UTC Orange

Anak Krakatau - 20200411/1114Z 

Fahrul Roji, A.Md., Anak Krakatau Volcano Observatory - 5 months ago

Recorded eruption at 10:48 UTC (17:48 local) Best estimate of ash-cloud top is around 2102 FT (657 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. ash-cloud moving to north, volcanic ash gray thick 500 meters high from bottom crater.

View
 

10th of April 2020, 5 months ago

2020-04-10 16:16:00 UTC Orange

Anak Krakatau - 20200410/1616Z 

Jumono, Anak Krakatau Volcano Observatory - 5 months ago

Recorded eruption at 15:35 UTC (22:35 local ) Best estimate of ash-cloud top is around 2102 FT (657 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. visually from cctv crater seen volcanic ash moving to east, volcanic ash Black-gray thick 500 meters high from the bottom of the crater. .

View
2020-04-10 15:11:00 UTC Orange

Anak Krakatau - 20200410/1511Z 

Jumono, Anak Krakatau Volcano Observatory - 5 months ago

Recorded eruption at 14:58 UTC (21:58 local ) Best estimate of ash-cloud top is around 1142 FT (357 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. visually from cctv crater seen volcanic ash moving to South, volcanic ash white-gray thick 200 meters high from the bottom of the crater. .

View
 

18th of March 2020, 6 months ago

2020-03-18 06:15:00 UTC Orange

Anak Krakatau - 20200318/0615Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 6 months ago

Eruption with volcanic ash cloud at 0542 UTC (1242 local). Ash-cloud not visible. Visuals directly from the cctv were observed eruptions with the color of the thick white-gray eruption smoke 300m from the top of the volcano, the wind direction slowlyto the south..

View
 

11th of February 2020, 7 months ago

2020-02-11 03:06:00 UTC Orange

Anak Krakatau - 20200211/0306Z 

Jumono, Anak Krakatau Volcano Observatory - 7 months ago

Eruption with ash clouds at 02:45 UTC (09:45 local time). The eruption lasted for 75 seconds. Ash-cloud not visible. Anak Krakatau volcano is not clear. .

View
 

10th of February 2020, 7 months ago

2020-02-10 11:43:00 UTC Orange

Anak Krakatau - 20200210/1143Z 

Bagus Puguh Wibowo, A.Md., Anak Krakatau Volcano Observatory - 7 months ago

Eruption with volcanic ash cloud at 1137 UTC (1837 local) Best estimate of ash-cloud top is around 3702 FT (1157 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to East. Thick black volcanic ash from the top of the crater. .

View
 

8th of February 2020, 7 months ago

2020-02-08 11:11:00 UTC Orange

Anak Krakatau - 20200208/1111Z 

Bagus Puguh Wibowo, A.Md., Anak Krakatau Volcano Observatory - 7 months ago

Eruption with volcanic ash cloud at 11.10 UTC (18:10 local) Ash-cloud not visible. Ash cloud is moving to North-West. Anak Krakatau .

View
2020-02-08 11:08:00 UTC Orange

Anak Krakatau - 20200208/1108Z 

Bagus Puguh Wibowo, A.Md., Anak Krakatau Volcano Observatory - 7 months ago

Eruption with volcanic ash cloud at 11:04 UTC (18:04 local) Ash-cloud not visible. Ash cloud is moving to North-West. Anak Krakatau .

View
 

7th of February 2020, 7 months ago

2020-02-07 06:57:00 UTC Orange

Anak Krakatau - 20200207/0657Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 7 months ago

Eruption with volcanic ash cloud at 0519 UTC (1219 local). Ash-cloud not visible. Anak Krakatau volcano is not clear..

View
 

6th of February 2020, 7 months ago

2020-02-06 02:13:00 UTC Orange

Anak Krakatau - 20200206/0213Z 

Bagus Puguh Wibowo, A.Md., Anak Krakatau Volcano Observatory - 7 months ago

Eruption with volcanic ash cloud at 0149 UTC (0849 local) Ash-cloud not visible. Anak Krakatau volcano is not clear..

View
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.