Wouldn't the Mid-Atlantic Trench dissipate the enegy of the Tsunami the way tha the abyss protected Diego Garcia from last week's tsunami?
The main reason DG was spared is that it was south of the main part of the tsunami wave.
There's also no Mid-Atlantic Trench. There's a Mid-Atlantic RIDGE.
Accounts are spotty but the tsunami in the Carribean Islands and the East Coast was fairly substantial (but not huge) from the 1755 Lisbon Earthquake.
You'd think so.... Not that it means we have nothing to worry about, but it seems like the idea is overblown. As someone else mentioned, tidal waves can becaused by things other than earthquakes--for example meteorites. It doesn't happen very often, but it's a big ocean, and a significant meteor strike anywhere in it could cause a very powerful wave. It could happen in the middle of the ocean, or it could happen a few miles offshore.