Our GNSS stations at #Askja are slowly coming back online as more and more sunlight is available for the solar panels. Inflation is still being observed although there was a change in rate during the fall months. Recently a new paper was published on this inflation period that started in July 2021. This includes modelling two different inflating sources at different depths using both GNSS and #Sentinel1 data.
Highly recommend attending such an event with very humble people in a very small field. Alas mostly unknown outside of their field. And hence it feels somewhat in crowd and I had odd feelings whether I fit in. But once you get rid of that feeling you can enjoy a very open community of a niche topic often overlooked.
We now estimate that 9 million m³ of magma have accumulated near Svartsengi since last eruption. This is based on modeling with both #InSAR and #GNSS data.
During the previous eruption the volume loss from the same reservoir is estimated at 9-13 million m³. Image is #sentinel1 unwrapped #interferogram covering 23 Jan – 4 Feb.
We now see clear signs of surface deformation. A recent 24hr. #interferogram based on data from our friends at #ICEYE shows inflation. Signal is centered around the Blue Lagoon (tourist attraction) and a geothermal power plant. We have seen inflation at this location before on 3 separate occasions before the first eruption at Fagradalsfjall. Earthquae activity is now clearly decreasing. More info: https://en.vedur.is/about-imo/news/a-seismic-swarm-started-north-of-grindavik-last-night
Some Reykjanes peninsula volcanic unrest updates 🔔
Our Civil Protection and emergency management just moved to uncertainty phase for the peninsula. This is because of a intense earthquake swarm that started early this morning close to the town of Grindavík (larges quake M4.5). Currently there are no signs of surface deformation based on our GNSS network. Will be interesting to see the next #InSAR analysis.
It's been two months since the 3rd Reykjanes peninsula eruption ended. Since then, we have had lots of earthquake activity and a fairly strong uplift signal now visible on both cGNSS stations and #InSAR signaling inflation due to magma. I believe we might be here for the long run 🌋
Map shows earthquakes from for the past 62 days and the past 3 lava fields with green (Skobeloff?)
I thought it might be interesting for some of the #gischat members of Mastodon to share some of my everyday map making. A thread with a single map and some info on the data, techniques, tips, and tricks. Let's go!
This map shows a recent #InSAR analysis for a volcanic caldera named Torfajökull. The InSAR signal shows there is surface inflation in the center of the volcanic caldera indicating sub-surface magma movement.
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Since April there have been signs of increased activity beneath #Fagradalsfjall. #InSAR analysis indicates inflation from a deep source beneath the eruption site. This afternoon an earthquake swarm started at Fagradalsfjall with more than 500 earthquakes detected. Most are very small but indicate magma movement. No signs of an imminent eruption at this timepoint although observations indicate we are moving towards that point at an unknown pace. Stay tuned!