http://www.tsunami-alarm-system.com/en/phenomenon-tsunami/occurrences-atlantic-ocean.html
http://www.abovetopsecret.com/forum/thread754207/pg1
Look up el Hierro and tsunami... Google will tell you all...
On the second site (ATS), people debunk the myth that El Hierro would cause a tsunami if you read far enough into the thread. Why? For the above reasons.
So Again...WRONG ISLAND.