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Germany, Freden: lacquer peel of fluvial sediments

Freden, Germany, lacquer peel, unfaulting, geology, sedimentology, slokkert

Lacquer peel of Pleistocene fluvial sediments in the Leine river at Freden, Germany. About 1m across. From the wall in the Shell Rijswijk laboratory until removed by a new director around 1990 (an IT manager).

Notes: below, see images of strain at slip transfer zones between faults (1 and 2), and unfaulting with vertical shear (3).

1. Original interpretation

In the ellipse, the slip of the left-hand fault dies out downwards while the slip on the right-hand fault increases downwards.

2. Unfaulted with strain display

Strain display, purple compression, blue dilatation from original to unfaulted. Colour scale 10% (light colour), 20% (dark colour).

Fault movement on the hanging-wall side.

In the ellipse, the slip transfer zone causes about 10% dilatational strain. There is no strain beyond the transfer zone.

3. Vertical simple shear

Optionally the software can restrict unfaulting movement to be vertical only. The lateral movement is handled by opening the fault planes according to the amount of lateral slip.

In complex situations the vertical shear display may help in understanding what’s going on.