Fault Surface Striae, Oslo, Norway

This is a very well exposed fault surface in Ordovician carbonate strata on the island of Hoved√łya, in Oslo's harbor (well worth the visit if you happen to be in the area). The feature to note and trace here is the well developed linear mineral growths on the fault surface (slickensides). These give an indication of the direction of fault movement. A close look may uncover some other patterns of interest in this image.

Questions that may arise are as follows. How does the orientation of the striae constrain what type of fault this is? Considering that the striae are defined by a mineral growth, what does that suggest about whether this fault produced earthquakes when it was moving?

Link to interpreted image.

Return to entry page.