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
 

4th of January 2019, 2 years ago

2019-01-04 12:01:00 UTC Orange

Anak Krakatau - 20190104/1201Z 

Nur Rokhman Hidayat, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 07:21 UTC (14:21 local time). The eruption lasted for 187 seconds. Best estimate of ash-cloud top is around 22282 FT (6752 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to North - NorthEast..

View
2019-01-04 06:01:00 UTC Orange

Anak Krakatau - 20190104/0601Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 0530 UTC (1230 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 17002 FT (5152 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north-northeast..

View
2019-01-04 01:34:00 UTC Orange

Anak Krakatau - 20190104/0134Z 

Nur Rokhman Hidayat, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with volcanic ash clouds at 01:31 UTC (08:31 local time). The eruption lasted for 50 seconds Best estimate of ash-cloud top is around 8554 FT (2592 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to north-northeast.

View
 

3rd of January 2019, 2 years ago

2019-01-03 03:27:00 UTC Orange

Anak Krakatau - 20190103/0327Z 

Nur Rokhman Hidayat, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with volcanic ash clouds at 03:17 UTC (10:17 local time). The eruption lasted for 128 seconds. Best estimate of ash-cloud top is around 22282 FT (6752 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to north-northeast.

View
 

2nd of January 2019, 2 years ago

2019-01-02 02:46:00 UTC Orange

Anak Krakatau - 20190102/0246Z 

Nur Rokhman Hidayat, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 02:38 UTC (09:38 local time). The eruption lasted for 71 seconds. Best estimate of ash-cloud top is around 17002 FT (5152 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash clouds is moving to north-east.

View
 

1st of January 2019, 2 years ago

2019-01-01 07:50:00 UTC Orange

Anak Krakatau - 20190101/0750Z 

Nur Rokhman Hidayat, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 07:45 UTC (14:45 local time). The eruption lasted for 776 seconds. Best estimate of ash-cloud top is around 9610 FT (2912 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to northeast.

View
 

27th of December 2018, 2 years ago

2018-12-27 05:58:00 UTC Red

Anak Krakatau - 20181227/0558Z 

Martanto, S.T., Anak Krakatau Volcano Observatory - 2 years ago

Continuing eruption and ash emission. Best estimate of ash-cloud top is around 77491 FT (23482 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northeast..

View
 

26th of December 2018, 2 years ago

2018-12-26 09:26:00 UTC Orange

Anak Krakatau - 20181226/0926Z 

Windi Cahya Untung, Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 09:00 UTC (16:00 local time). The eruption is continouing Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to north-northeast. ash cloud height is not visible.

View
 

24th of December 2018, 2 years ago

2018-12-24 07:48:00 UTC Orange

Anak Krakatau - 20181224/0748Z 

Martanto, S.T., Anak Krakatau Volcano Observatory - 2 years ago

Continuing eruption and ash emission. Ash cloud not visible due to bad weather condition. Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast..

View
 

21st of December 2018, 2 years ago

2018-12-21 08:57:00 UTC Orange

Anak Krakatau - 20181221/0857Z 

Windi Cahya Untung, Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 08:47 UTC (15:47 local time). The eruption lasted for 776 seconds. Best estimate of ash-cloud top is around 8851 FT (2682 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to north.

View
2018-12-21 08:28:00 UTC Orange

Anak Krakatau - 20181221/0828Z 

Windi Cahya Untung, Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 07:51 UTC (13:51 local time). The eruption lasted for 132 seconds. Best estimate of ash-cloud top is around 7795 FT (2362 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to north.

View
 

20th of December 2018, 2 years ago

2018-12-20 02:48:00 UTC Orange

Anak Krakatau - 20181220/0248Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 02:34 UTC (09:34 local time). The eruption lasted for 88 seconds. Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 7795 FT (2362 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north..

View
2018-12-20 01:50:00 UTC Orange

Anak Krakatau - 20181220/0150Z 

Jumono, Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 01:21 UTC (08:21 local time). The eruption lasted for 61 seconds. Best estimate of ash-cloud top is around 5683 FT (1722 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to north.

View
 

18th of December 2018, 2 years ago

2018-12-18 11:57:00 UTC Orange

Anak Krakatau - 20181218/1157Z 

Windi Cahya Untung, Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 11:23 UTC (18:23 local time). The eruption lasted for 103 seconds. Best estimate of ash-cloud top is around 6739 FT (2042 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud is moving to east.

View
 

14th of December 2018, 2 years ago

2018-12-14 07:57:00 UTC Orange

Anak Krakatau - 20181214/0757Z 

Deny Mardiono, A.Md., Anak Krakatau Volcano Observatory - 2 years ago

Eruption with ash clouds at 07:45 UTC (14:45 local time). The eruption lasted for 48 seconds. Best estimate of ash-cloud top is around 5683 FT (1722 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northeast..

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.