I was wondering about this myself. I've been checking up on the earthquakes daily and have noticed bigger earthquakes than the one that the article Koir posted talked about. I haven't heard anything about tsunamis either... according to Yahoo.co.jp there hasn't been any recent warnings. I found one
website that showed that there might be a .5 meter (at its greatest height) tsunami... which seems like what the article Koir posted is talking about. That tsunami would have (or did come) at around 7:25-7:30 this morning. As far as I know that article was written after the fact, so I don't get the point.