This is a totally meaningless earthquake, but I just wrote this for the graphic. This is the Google map from the USGS earthquake site. I was also looking at this map with the recent Australian earthquake. That whole teapot shape is the Australian plate, so both the Christchurch and Barrier Reef earthquakes can be considered to be Intraplate earthquakes. (I started that Wikipedia article!). This earthquake is right on the edge of the plate, and is a standard interplate earthquake. Much like Japan, we would expect that whole section to rip in a giant M9plus one day.
If they can find lowland marshes in Australia, it would be interesting to find the frequency of large tsunamis hitting that coast. Probably about every 500 years.
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