Yesterday (30.01.2017) there was exactly one week (article here) since last earthquake activity in Bárðarbunga volcano. In this weekly activity there is an emerging pattern, that pattern is that earthquake magnitude is growing. Number of earthquakes happening in each swarm has not increased that I have noted (at the moment at least). Magnitude 4,3 earthquake moves the fault few mm upward in this case. Those millimetres have now started to add up. I don’t know what the inflation currently is due to lack of GPS data at the moment.
Latest earthquake swarm had magnitude (in the order they happened), magnitude 4,3, magnitude 4,1, magnitude 3,4. Depth of this earthquake swarm was also slightly different, being from 9,4 – 8,3 km. It is difficult to know for sure what is going on at this depth, magma might be creating path for it in the crust on its way to the surface or this simply might just be the fault inside the caldera moving upward at slow phase. Earthquake activity happens when fresh magma is injected into Bárðarbunga volcano. This is going to continue to happen for a long time, maybe until next eruption.
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