Mannum earthquake shakes homes, but goes unnoticed by many

An earth tremor with a magnitude of 3.3 on the Richter scale has shaken homes in the Murraylands, but did not stir everyone.

The tremor, at 8.31pm on Wednesday, was centred on a point about six kilometres south of Palmer, at a depth of 10 kilometres, according to Geoscience Australia.

Several Murraylands residents reported hearing two large bangs or a rumbling sound, feeling their houses move or seeing windows rattle.

"Felt like someone had hip-and-shouldered my chair," said Murray Bridge resident Vanessa Bulstrode.

Geoscience Australia estimated the quake would have been felt up to 31 kilometres away, though some people reported noticing it in Adelaide. Image: Geoscience Australia.

Geoscience Australia estimated the quake would have been felt up to 31 kilometres away, though some people reported noticing it in Adelaide. Image: Geoscience Australia.

But many others said they did not notice a thing, including Glenys Roennfeldt.

"(I) was at Palmer Hotel playing eight-ball," she said.

"Didn't feel a thing.

"Bugger – that could have helped put some of my balls into the pocket."

Several commenters said this tremor felt weaker than one of 3.7 magnitude which struck the east side of Murray Bridge in 2017.

For comparison, the quake which shook Lombok, in Indonesia, on August 5 had a magnitude of 6.9.

Because each point on the Richter scale is 10 times more powerful than the last, the Indonesian quake would have been almost 4000 times stronger than the Mannum tremor.

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