There was a link offered to a (translated Japanese) technical summary of the earthquake and resulting Tsunami, but when I checked it it was all a bit dry. Well, it's been updated with lots of pictures and animations and diagrams and such, all a bit higgledy-piggeldy, but there's some interesting stuff in there.
Check it out
here.
It's fascinating looking at the seismograph readings before, during and after the 9.0. They've been getting a steady stream of fairly potent quakes since the big one, and there was of course little "warning" in the form of fore-shocks. The before / after comparison in that respect is striking.
Japan had been expecting somewhere around a 7.5 magnitude earthquake in the area, based on a
forty year cycle. At the same time, there is evidence of
large earthquakes around 8.5 on an 800 to 1100 year cycle over the last 3000 years (ascertained by dating the distribution of deposits of sand in the Sendai plain), the latest one being well "overdue" - possibly until now. I wonder if there really is anything in this regularity. Oh, apparently the BBC have
beaten me to it.
Also, some kind soul has been plotting the output from a "Geiger counter" (or similar device) over the last 15 hours
somewhere in Tokyo. Find that
here.