South Isalnd residents have been left rattled after two earthquakes on Saturday including a magnitude 5.0 quake in Fiordland.

According to monitoring site Geonet, the quake struck just before 8pm with an epicentre 40km north-west of Te Anau, at a depth of 56km

There were reports of a 'good shake' in Queenstown and Invercargill but no reports of damage.

As of 8.20pm, about 30 minutes after the earthquake struck, a total of 1340 people had reported feeling the rumble to Geonet, mostly from the Fiordland and Central Otago areas.

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It comes after a series of smaller quakes around Christchurch over the last few days, the latest a 3.4 magnitude quake 5km south of Christchurch on Saturday afternoon.

The quake hit at 3.19pm about 5km south of Christchurch, according to Geonet, in the Port Hills. The earthquake had a depth of 4km.

More than 6000 people had registered feeling the quake.

"As if being in lockdown wasn't enough! That was a good shake although it was only M3.4 in the Port Hills but it was shallow at 4km deep. We have had almost 6,200 felt reports from around Christchurch - remember to drop cover hold," Geonet tweeted shortly after the quake.

A Mt Pleasant resident said the house was "rattling and shaking".

"It gave me a fright. The reason you feel bad is this was not out of the blue. This is about the third one in a few months," the resident whose house was destroyed in the 2011 earthquakes said.

"If we had a big one now it would be disastrous. It's very disconcerting," the resident, who did not want to be named, said.

"For us the Covid-19 lockdown is a breeze compared to the earthquakes."

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Satirist Joe Bennett, who lives in Lyttelton said the earthquake was nothing compared to what Cantabrians had experienced before.

"I felt it. It wasn't significant. Ten years ago it became a game to estimate the magnitude of each shake and anything under 5 didn't rate a mention.

Another Christchurch resident tweeted: "Ah, heard that one coming maybe a second before it hits. Bit of a jolt in Riccarton, Christchurch."

A police spokeswoman was unaware of any incidents arising from the earthquake.