The Flinders Ranges have been shaken by a minor earthquake felt up to 30km from the epicentre near Wilmington.

The quake was felt around 9.50am today and measured 3.5 on the Richter scale.

It is the second-largest quake in SA this year and follows a magnitude 4.5 event north-east of Peterborough on January 26.

Primary Industries and Resources SA seismologist David Love said quakes in the ranges were not uncommon.

"Last year, about 250 earthquakes were recorded in the state and 80 per cent of lose were located in the Flinders and North mount Lofty Ranges," he said.

Wilmington is around 40km south-east of Port Augusta.