New Zealand's city of Christchurch has been hit by two shocks that closed some stores but caused no major damage.

The continuing shocks are expected to further delay recovery from the devastating 22 February quake.

The shocks - one of magnitude 5.0 - early on Monday caused goods on supermarket shelves to fall and smash, and increased nervousness in the city.

A total of 181 people died in the 6.3-magnitude quake in February, which also destroyed hundreds of buildings.

The latest quake hit at 0909 local time (2109 GMT on Sunday) and was centred 22km (14 miles) west of the city at a depth of just 3km (almost two miles), the US Geological Survey said.

Stock fell off the shelves in the Warehouse supermarket, near the tremor's epicentre.

"The store's a bit of a mess. There's a lot of glass, but nothing too bad," said worker Jo Edmond, who admitted she was feeling "a little bit nervous".

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