I was buying an i-phone and the sales guy and I just kept working on the contract while people around us were freaking out in a quiet and composed Japanese manner. Didn't seem that much stronger than other tremors that I've felt here.
But people were staying out on the streets, congregating in department stories, afraid to go home, I guess. I don't know why, it's so far from the epicentre.
edit - I watched some videos in Tokyo, and it certainly was beyond the keep-working-on-what-you're doing threshhold. So I guess it was because we were on the ground floor. Funny, I just got back to Tokyo from Thailand this morning and had been talking to a Thai friend who was terrified of earthquakes, I told him it was nice in Thailand to feel safe to go to bed without preparing valuable books etc for a quick escape like I usually do.
Kammalakkhano , bhikkhave, bālo, kammalakkhano pandito, apadānasobhanī paññāti
(The fool is characterized by his/her actions/the wise one is characterized by his/her actions/Wisdom shines forth in behaviour.)
(AN 3.2 Lakkhana Sutta)