Important update concerning are Hekla and Katla data "harmonic tremor' or no:
[link to volcanocafe.wordpress.com
February 20, 2012 at 21:49
Totally disagree on “Ice-Quakes” this time or ANY OTHER TIME. Prepared bet my Húfa on that. There are many “skriðjöklar” (crawling-glaciers) on edges on all the Icelandic Glaciers, but strange (looking at many EQ charts) they (EQ´s) do not (regularily) appear where they (skriðjöklar) are! But people also often forget Icelandic Glaciers are NOT like the Glaciers in Greenland. Here they are with much lower density(?), not compact, more like compacted snow (grainy?) and have high wather content (Icelandic term is “Þíðjökull” against, near solid frosen ones in Greenland – Most of the time – but there is lots of water in Greeland Glaciers in summer season – even creating lakes in shallows, large enough for Catalina flying-boats to land on! It was done during WW-2.
No glacier(s) around Hekla for example. We have Glaciers at Tindfjöll, Torfajökull, Myrdalsjökull and Eyjafjallajökull.
Microseism ok. Problably due magma on (lateral?) move I think, rather than rising. Maybe its in more than one location, or alternatively flowing both east and north, from Katla, or some flowing away from Hekla?. Maybe Katla (and Hekla) is simply “full” and as “roof” does not “give way” it probably flows laterally thrugh old faults or channels."
IMO Islander it is closer to true.