This is interesting, posted by someone on a message board:
"The West Coast is riddled with fault lines, thus earthquakes do not project as far as on the East Coast, which has few fault lines, and is primarily hard rock - that's why an earthquake of moderate strength can be felt up and down the East Coast."
Makes sense to me; anyone here know if that's actually a true statement?
Meanwhile Faux News apparently ran this actual screen-crawl earlier: "No Tsunami Expected After East Coast Earthquake".
Oy.