It was a pretty good shake in the Tokyo area. Centered up in the Tohoku region where the March 11 quake and wave occurred. I think initially it is a Japanese shindo 4 (Magnitude 7.1 has now been stated).Not as powerful as March quake, but perhaps just as long in duration. Heads up. The predictions of a tsunami are only at around 50 centimeters high (at this point at least).