You have the data.
Do the statistics and you tell us if it is outside the normal distribution, and how far outside normal.
Me, I'd expect a deviation from the norm due the the number of high magnitude aftershocks (and foreshocks) of the big Japan temblor.
Sorry, johannes, but I feel you are trying to lead me into doing your math for you, and if I find an anomaly, you'll turn that into support for your theories, which have been shown time and time again to have no basis in the real world.