VONA message

Fagradalsfjall

Time: 20. Jul 2023, 17:01 GMT

Color code:  Orange 

Volcano id: 371032

Activity summary:
The eruption which commenced in Litli-Hrútur on the 10 July continues in a stable manner without major changes. Lava flows continue propagating towards the south and volcanic plume rich in SO2 is raising above the crater. The latest measurement of SO2 flux was done on the 18 July and showed values of 40 kg/s. The lava extrusion rate has been lately assessed to be about 9 m3/s. No volcanic ash is produced by this eruption and the aviation color code is kept orange.

Cloud height:
The gas plume height continues to be within 1-2 km asl as assessed by calibrated cameras

Other cloud information:
No volcanic ash is measured or observed.

Remarks:
An updated hazard map has been prepared for the eruption site at Litli-Hrútur. The new map shows the revised location of the dike intrusion between the 4-10 July 2023, based on both new deformation modelling and seismic relocations. The dike intrusion which was emplaced prior to the eruption onset extends from Keilir in the north to Meradalahnúkar in the south (https://en.vedur.is/about-imo/news/earthquake-activity-in-fagradalsfjall-area). The main hazards in the area are: Gas emissions: Sustained and localized gas pollution that increases when winds are lower. Dangerous and potentially fatal gas levels may accumulate in topographic lows Lava flows and rapid outflows of lava due to crater collapse or changes in topography (e.g. rapid outpourings of lava over escarpments) Blocks of lava which may fall from the lava´s edge accompanied by sudden advances of new lava from and over the edge at speeds that one may potentially not outrun Openings of new eruptive fissures without any warning Moss fires: Lava can ignite vegetation fires that can dramatically decrease air quality at the site