Saturday's earthquake took scientists by surprise, as it revealed a new faultline in a territory not known for seismic activity.
GNS Science staff yesterday found signs of the quake's epicentre, 14km south of Darfield, which lies 50km west of Christchurch.
Aerial surveys revealed a dark, 24km-long scar across paddocks and roads where the shallow tremor offset the land.
The faultline cut roads 4m apart, dug up mounds of earth, and in some places formed a waist-high step in the land.
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