Fagradalsfjall volcano (Reykjanes Peninsula, Iceland): monthly eruption summary

Thu, 1 Jul 2021, 04:29
04:29 AM | BY: MARTIN
The graph shows parameters of the lava flow discharge rate, lava area, lava volume, rock geochemistry and volcanic gases over the past month (image: IMO)
The graph shows parameters of the lava flow discharge rate, lava area, lava volume, rock geochemistry and volcanic gases over the past month (image: IMO)
On 26 June, the University of Iceland's Institute of Earth Sciences reported a summary of eruption parameters documented since May 10. The parameters showed lava flow discharge rate, lava area, lava volume, rock geochemistry and volcanic gases. The graph below depicts an overview of the results.

Lava flow discharge rate
The average lava flow discharge rate at the eruption site during the period 11-26 June is about 13 cubic meters per second, which indicates a stable flow level in comparison to the most other eruptions.

Lava flow area
The lava flow area covered 3.82 square km.

Lava flow volume
Scientists estimate that approximately 80 million cubic meters of the lava have so far erupted from all vents.

Rock geochemistry
The graph shows the weight percent (wt.%) of magnesium oxide (MgO) (10%) and titanium oxide (TiO2) (9,9%) in the erupted magma.

Volcanic gases
Monthly average sulfur dioxide (SO2) emissions reached 4200 tons per day and carbon dioxide (CO2) emissions reached 10000 tons per day.
Source: Icelandic Met Office volcano activity update 30 June 2021

The eruption in Fagradalsfjall is in many ways different from eruptions witnessed in recent decades. Most eruptions have originated in magma chambers under main volcanoes, where the pressure in the chamber and its size seem to largely determine the size and length of the eruption.

In Fagradalsfjall, this seems to be protected somewhat differently. It can be seen that the inflow vein and its properties have a great influence on the magma flow. The channel opened was relatively narrow and long (reaching a depth of ~ 17 km) and the carrying capacity was limited. An increase with time indicates that the channel has expanded somewhat over time, probably due to erosion in its walls. It can not be seen that the pressure in the source has decreased significantly and therefore the flow increased when the channel widened. There is currently no way to predict how long the eruption will last or whether lava flows will continue to increase.
Source: University of Iceland's Institute of Earth Sciences volcano activity update 30 June 2021

Previous news

Wed, 16 Jun 2021, 16:27
Activity at Fagradalsfjall today (image: mbl webcam)
The eruption goes on with no significant changes. Today, long-lasting periods occurred when lava flows were erupted from the main vent onto the immediate surrounding areas, creating beautiful surface flows and adding to the height of the central part of the growing lava shield. Read all
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