Assuming that epicentral locations are accurate, the ongoing icequake swarm at Skeiarßrj÷kull is occurring within the subglacial catchment of S˙la.
For the latest epicentres, see: http://hraun.vedur.is/ja/viku/2004/vika_42/bab.gif
This suggests that either a minor j÷kulhlaup from GrŠnalˇn is in progress, or that rainfall within the last 24 hours has caused increased sliding at the glacier bed. Skeiarßrj÷kull has received at least 40-mm of rainfall since ~08.00 hours yesterday, so we presently suspect that rainfall is forcing the seismicity, either directly due to meltwater reaching the glacier bed, or indirectly through rainfall-induced leakage from GrŠnalˇn. Rainfall is expected to intensify over Skeiarßrj÷kull today.
If seismicity levels increase, or if new epicentres appear on the eastern side of Skeiarßrj÷kull, then we will send another up-date.
Me bestu kvejur,
Matthew Roberts og Halldˇr Geirsson