A hectare of fresh striations on the Arkitsa Fault, central Greece

Some large new exposures of active normal faults in central Greece reveal polished surfaces that could represent as many as 50 increments of co-seismic slip. The slip surfaces are nearly two-dimensional, with the slip vector aligned down the axes of corrugations and undulations. However, small, but regular, changes in slip vector between top and bottom of the exposure and a regular asymmetry of the polishing on corrugations may be related to block rotations about a vertical axis, and show how the slip vector changes with time.