Secondly I remain severely troubled by the continuous harmonic tremor...if anything beside a full scale eruption that will weaken the earth it would be the non-stop tremor.
At least the activity is south of El Hierro for now and that is most likely where a collapse would occur. If it does, it should lessen the force of a tsunami to the the other islands, northern EU countries or our East Coast?
Then again, these quakes started on the other side or underneath the island and worked themselves South until the magma vented. There could be a chance of the venting working its way back underneath the island. Imagine the catastrophe if the island split in half and one or both halves collapsed into the ocean!