Deadly Christchurch quake's record ground-shaking lower than first thought

CARYS MONTEATH/Stuff
Destroyed shops on Manchester St in the Christchurch CBD after the February 2011 earthquake.
Study co-author Yoshihiro Kaneko said the earthquake was a rare event that produced very strong ground motions, and some unusual site effects.
At the sites examined in the study, the ground motion recorders were working accurately, but the concrete slab foundations in the buildings they were kept in partly loosened from the underlying soil, exaggerating the shaking.
A station at Heathcote Valley Primary School, near the epicentre of the quake, recorded a vertical peak ground acceleration of 2.2g, or just over twice the force of gravity.

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