I'm quite happy that this matches with my rock mechanics model. For every earthquake in the outer zone, there should be one on the boundary fault under the city. Of course they don't have to take place at exactly the same time! Although the outer quakes are diffused and limited to M5 or 6, the main fault has a fractal mechanism to M7. As I've said, a big earthquake under the city would confirm my fears for Hamilton, which has an identical mechanism.
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