Abstract Field study at two locations in western Scotland is described and gives evidence for fault movement and seismic activity during the late- and post-glacial epochs. The evidence comprises levelling survey of raised marine shorelines, remote sensing study of lineaments, radiocarbon dating of Quaternary sediment, and detailed field examination of faults and fault-gouge material. Vertical fault displacements of up to 3 m are observed on a c.10,500 year old raised marine shoreline on the Isle of Mull, and repeated predominantly lateral, movement is observed on a prominent 14 km-long fault lineament active since ice retreat and as recently as c.2000 yrs B.P. The fault movements are located close to the edge of the area formerly covered by the Loch Lomond Readvance ice cap (11,000–10,000 yrs B.P.). They are considered to have been caused by rapid rates of isostatic rebound soon after deglaciation.