A SERIES of earthquakes in Western Australia's Wheatbelt is a coincidence and not a cluster, Geoscience Australia says.
On Tuesday, a 2.2 magnitude earthquake struck northeast of Koorda, where two further quakes - magnitude 2.6 and 2.2 - hit the following day.
Geoscience Australia senior seismologist Johnathan Bathgate says there is an active fault in the Wheatbelt, where more than 200 earthquakes have been recorded this year.
That isn't unusual, he says.
While last week's string was notable, it wasn't a cluster or "swarm" of earthquakes, which was defined as dozens of them in a radius of about 10km, he said.
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