Geonet reported a 4.5 aftershock in Christchurch on the 15th May 2012. The shake occurred at 1:27pm and was centred in the ocean near New Brighton. Canterbury Quake Live recorded the depth as 10.39 kilometres and it measured v on the Mercalli scale. This means the quake was felt by almost everyone, some people awakened. Small objects moved. trees and poles may shake.
Locals described it as a jolt followed by an extended wobble. Facebook comments included the following:
Well that was a good rocker
The house is still moving
That will have rattled a few more rocks off the cathedral
The widespread feeling was it was the biggest shake most residents had felt for several weeks.