4.2 quake shakes Christchurch

A magnitude-4.2 earthquake has shaken Christchurch.

GeoNet reported that the shake was centred near Rolleston and was 12 kilometres deep.

More than 500 "felt" reports have been logged on the site.

People took to Twitter and Facebook after the quake.

Radio personality and Press columnist Mike Yardley said it was the first quake he had felt in Christchurch for a while.

"Felt like riding over a judder bar on a bike with a loose tyre," he said.

- Did you feel it? What did you experience?