The earthquake today (11-November-2021) at 13:21 UTC with the magnitude of Mw5,2 seems to align it self with faults that are part of SISZ rather than being part of Hekla volcano system. The high frequency tone on 2 – 4Hz that I did see on few nearby SIL stations has started to lower again after the main earthquake. Earthquake activity in the area is currently dropping but it might increase again without warning.
It is not possible to know what happens next in this area. Historically the area can have earthquakes with magnitude up to Mw7,0 in size, but those are all from South Icelandic Seismic Zone (SISZ), rather than any active volcano in this area. This area is complex because of overlapping volcano system that often go on top of each other, along with the faults from SISZ. More earthquake activity from the fault that broke today or nearby fault should be expected in next few days to weeks.
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