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.
USGS30th of March 2020, 3 days ago
Eruption with volcanic ash cloud at 0016 UTC ( 0916 local). Best estimate of ash-cloud top is around 5853 FT (1829 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east.
ViewEruption with volcanic ash cloud at 2326 UTC (0826 local). Best estimate of ash-cloud top is around 4893 FT (1529 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east.
View28th of March 2020, 5 days ago
Eruption with volcanic ash cloud at 2355 UTC (0855 local time) Best estimate of ash-cloud top is around 6800 FT (2125 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to north.
ViewEruption with volcanic ash cloud at 1715Z (0015 LT). Best estimate of ash-cloud top is around 14298 FT (4468 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west.
ViewEruption with volcanic ash cloud at 1225Z (1925 LT). Best estimate of ash-cloud top is around 19098 FT (5968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash coud moving to west.
View27th of March 2020, 6 days ago
Eruption with volcanic ash cloud at 2221Z (0521 LT). Best estimate of ash-cloud top is around 15898 FT (4968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash coud moving to west.
ViewEruption with volcanic ash cloud at 2142 UTC (0642 local time) Best estimate of ash-cloud top is around 5200 FT (1625 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. White to grey ash cloud moving to north.
ViewEruption with volcanic ash cloud at 1446 UTC (2146 local). The eruption lasted for 180 seconds Best estimate of ash-cloud top is around 12698 FT (3968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
ViewNo eruption occurred after the last eruption on 27 March 2020 at 03:56 UTC (1056 local) Ash-cloud not visible. Ash-cloud is not visible.
ViewEruption with volcanic ash cloud at 0356 UTC (1056 local). The eruption lasted for 420 seconds Best estimate of ash-cloud top is around 25498 FT (7968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.
View26th of March 2020, 1 week ago
Eruption with volcanic ash cloud at 0830 UTC (1730 local time) Best estimate of ash-cloud top is around 6160 FT (1925 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to West.
ViewEruption with volcanic ash cloud at 2344 UTC (0844 local). Best estimate of ash-cloud top is around 5213 FT (1629 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south.
View24th of March 2020, 1 week ago
On 25 Maret 2020, observed brown ash emission at 22:59 UTC ( 05:59 Local Time ) Best estimate of ash-cloud top is around 13776 FT (4305 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash emission moving West - Southwest..
View23rd of March 2020, 1 week ago
Eruption with volcanic ash cloud at 0904 UTC (1804 local). Best estimate of ash-cloud top is around 4573 FT (1429 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest..
ViewVolcano 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.
