The seismic event is interpreted as part of a sequence began with the earthquake of September 3, 2010 in the town of Darfield with 7.0 M although it seems there is no structure that puts relate the two events .
From a tectonic point of view, New Zealand is at a transform fault and called the Alpine Fault, which cuts at an angle on the island. This structure at the global scale, is a transform plate boundary between the right and the Australian Pacific. The focal mechanism of event September 3 shows a kinematic slip faults from the right, compatible with the Alpine Fault, while the event of 21 February shows a thrust fault from kinematics, probably associated with a tectonic-type Well-compression at the seismic event.
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