Magma Is Trapped, Tremors Reversed, Iceland Grindavik Fagradalsfjall Litli-Hrútur Volcano Eruption

Þorvaldur Þórðarson, professor of volcanology at the University of Iceland, says there is a possibility that magma has also emerged from a deeper storage chamber below the ledge with the movements that have occurred on the Reykjanes Peninsula in the last few days and weeks.

"More straight up then," he says, adding that the ledge then went off and partially emptied in connection with it. Þorvalður says in an interview with mbl.is that he actually thinks it is very likely.
A journalist asks Þorvald more about the sea he mentions and what could be there on the trip. He says that the bedrock beneath the surface on the Reykjanes Peninsula is very layered.

"There are a variety of rock types there. We have lava layers, tuff and sedimentary layers. This diversity means that when something is going up, it passes from one stratum to another, and each stratum has different properties. It can affect the magma's loft. The specific gravity of the sedimentary layers, for example, is much lower than the specific gravity of the lava layers. The sediments can sometimes act as a bit of a trap."

Þorvalður then says that the previous eruption on the Reykjanes Peninsula simply had enough power to get through.

What happens if the new fissure fills with magma without magma breaking up to the surface?

"If magma continues to flow up from the deeper reservoir and into this shallow shelf, then the process we were in before could be repeated."

If we have received a relatively large magma insert from the lower chamber, which then forms the passage, and the magma in the shelf is added there as well, then we can even get a repeat of that later or in two to three weeks," says Þorvaldur.

https://www.mbl.is/frettir/innlent/2023/11/15/kvika_liklega_komid_beint_upp_ur_dypra_holfi/