The quake that hit near the New Zealand town of Wanaka has been revised down to a magnitude 5.8.
The quake, centred 30km northwest of the central Otago town, hit just before 2.30pm on Monday.
It was just 4km deep and its intensity has been described as severe by GeoNet.
A magnitude 3.5 aftershock was recorded shortly afterwards.
Leungo Lippe from BoaBoa Food Company, which is situated on Ardmore St facing the lake, said there was no panic when the quake struck.
"It was a mild shake - there's not too many people about," he told AAP.
"It was just sort of a roll, it wasn't really a jolting [quake]."
Police say there are a small number of reports of broken windows, but no major incidents have been reported to emergency services.
The quake has been widely felt across the South Island and more than 3000 felt reports have been submitted to GeoNet's website.
WHAT THEY'RE SAYING ABOUT THE QUAKE ON TWITTER
* "Sounded like kitchen exhaust fan rumbling, but whole foundations of building felt shaky for what must have been at least 10 seconds" - @stephaniemegan4
* "Thought it was my overactive over exhausted brain playing tricks on me when my bed started shaking. Then noticed the swinging lights" - @Renatus_Paul
* "What a rolling earthquake - felt in central Dunedin, building creaking and swaying" - @elliedavionte.
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