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PETER GRIFFIN 
It is interesting how the eastern limit of aftershocks boarders the sea; is this an error in the presentation, an interesting coincidence, a result of underlying geology, or something else? The sea is shallow and the Canterbury shelf continues out to the Chathams…
Also all of the aftershocks progress to the east of the initial rupture, so are there built up stresses to the west that maybe released via a different fault network {Alpine fault :(} sometime later?