Christchurch Quake distribution.

Regarding my post on the Christchurch Earthquakes. Here is a screengrab of published seismic activity during the last seven days in that area. From the 18th to the 25th February, New Zealand dates and times.

As I posited earlier, the majority of the activity, including the big ones, have all been located in a fairly tight geographical area in the north caldera wall of an extinct volcano. The dots show the epicentre of each tremor, colour coded for depth.

The thought occurs that if one side of a caldera shifts, that moves the stresses around, and it's only a matter of time before more tremors hit around the rest of the perimeter. When and where appear to be the only issues outstanding.