A earthquake has been felt across Adelaide, with residents quickly taking to social media to report a “rumble” of about three seconds.

Geosciences Australia has confirmed the tremor  – centred 15-20km south of Blackwood – registered 2.6 on the richter scale.

Earlier this morning, an earthquake registering 3.0 on the richter scale was recorded by the agency in the Flinders Ranges near Hawker.

It is estimated that this earthquake, recorded at 4.30am, could have been felt by people up to 23km away, the agency says.

How Adelaide residents responded:

Interactive: Every South Australian earthquake on record:

– Earthquakes are represented by points on the map. The larger the point, the higher the magnitude.

– You can sort the earthquakes by magnitude and year using the two sliders in the top right of the visualisation. Try moving the sliders to find only earthquakes from 1954 – the year of Adelaide’s most famous earthquake.