I used the resources at this Web Site to make a map of all (or at least most) of the earthquakes since September 4, 2010. I was thinking that they might reveal a more-or-less circular zone, encircling the North Canterbury Plain, that was moving counter-clockwise (and in the case of the Greendale Fault, and in the Christchurch vicinity, moving counter-clockwise a lot).Nevertheless, the picture looks more intricate than I had first imagined. Not a circular region, but possibly a triangular region encircling just a portion of the North Canterbury Plain. And a broken wedge to the west too. Like shards. Interesting how the quakes mostly stop just a short distance offshore. And there is a western branch, and maybe even a southern branch. Kind of forms an "X" near Darfield. No third dimension here with these images, so maybe details are getting lost, but it's certainly interesting to look at!
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