from a friend in Japan...

The table below shows the incidence and average magnitude of earthquakes since the 11th March. I should point out that these are only the earthquakes that have affected me!

Week No of Earthquakes Av. Magnitude

1 131 5.4
2 31 5.2
3 16 4.9
4 20 4.6
5 50 4.8
6 24 4.5
7 12 4.9
8 14 4.7
9 13 4.3

It seems to show that there was a progressive quietening over the first month, then another major spate of activity followed by another quietening. If there's going to be another increase in activity after another month, it should start about now. I hope not, as we're still averaging about 2 earthquakes per day which is about 20 times the norm that we had over the whole of last year. In other words there's still a lot of activity going on but it does seem to be diminishing in both frequency and magnitude - as one would expect.

FYI as I was typing, I had to adjust the week 9 figures from 12 to 13 and 4.4 to 4.3!