The latest international research reveals that Iceland's Fagradal volcanic eruption earthquake and magma movement

2021 Fagradal volcanic eruption (picture from Kristinn Ingvarsson). Siplinger · Nature Picture Conferring

China News Service, Beijing, September 15th (Reporter Sun Zi French) The latest global scientific papers published in the latest international academic journal "Nature", the researchers revealed that they were observed by the Fergradar volcanic eruption and eruption in 2021 in 2021. The unexpected earthquake activity and magma movement, the results of this research are of great significance for people's understanding of the volcanic eruption and the monitoring of volcanic activities in the future.

The Fagradal volcano is located on the Reykjane Peninsula and is about 40 kilometers away from the Icelandic capital Reykjavik. In the past 3000 years, the volcanic activity of the Reykynes Peninsula is characterized by a eruption period of 200-300 years, with a dormant period of 800-1000 years. The eruption in 2021 began on March 19th. There were about 800 years of dormant period before. The earthquake activities and surface deformation of the surface before eruption have increased, but these activities have weakened unusually a few days before the eruption. At the beginning of the eruption, the magma flow rate was very low, and the lava flow was very small, but by the end of April, the magma flow rate was observed, accompanied by a high lava fountain. Understanding the precursor of volcanic eruption and the process of eruption is important for early warning that can save life and protect infrastructure.

In the first paper, Freysteinn Sigmundsson, the Iceland University, Michelle Parks, Michelle Parks, and colleagues studied the Fergladal volcano in Iceland 2021 This time Breakfast. Before many volcanic eruptions, with the rushing of magma to the surface, the ground displacement speed and the number of earthquakes increase. Although the eruption of the Icelandic volcano in 2021, the earthquake activity and surface deformation appeared from February 24th to March, a few days before the eruption, the deformation and the weakening of the earthquake were observed.

They believe that due to the movement of the surface sector, the power before eruption will be stored in the crust. Before eruption, these forces will be released with the illegal enters of the crust. The subsequent earthquake activities and surface deformation weaken or indicate that the process is temporarily over, and the magma is about to eruption. At the same time, their research results show that when the volcanic eruption is predicted, the interaction between the volcanic process, structural stress, and crustal structure needs to be considered.

In another paper, Sæmundur Halldórsson and colleagues at the University of Iceland studied the lava sprayed 50 days after eruption. These analysis reveals that the magma directly comes from the crust and the mantle interface (near Moho interface). They pointed out that the sprayed lava will change over time; at the beginning of the eruption, the lava mainly comes from near the interface of this shell, but in the next few weeks, the lava composition has changed, prompting it to from the deeper magma.

The results of their research show that the magma storage area near the Mohuo interface is a very strong environment, and the magma will be mixed at a very short time scale (a few days to a few weeks). This shows that the real -time formation of the magma is fast. The author said that the above results are some of the first direct observations of this deep basalt magma system, which may increase our understanding of such volcanoes.

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