Anderson’s theory of faulting. Goals : 1) To understand Anderson’s theory of faulting and its implications. 2) To outline some obvious exceptions to Anderson’s theory and some possible explanations for how these exceptions work. Primary assumptions.
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Goals: 1) To understand Anderson’s theory of faulting and its implications. 2) To outline some obvious exceptions to Anderson’s theory and some possible explanations for how these exceptions work.
Hypothetically requires 2 of the 3 principal stresses to be parallel with the surface of the earth
What are they?
What kind of faults would you expect at each?
What dip angles does Anderson’s theory predict for
Reverse faults: should form at ~30° dip
Normal faults: should form at ~60° dip
Strike-slip faults: should form at ~90° dip
Can you think of any exceptions??
High Pf can lower effective stress
This can activate slip on a low-angle fault
However, if cohesive strength is sufficiently low...
It also doesn’t work well for low-angle normal faults
Donath (1961) produced shear fractures at very low angles to σ1 in anisotropic rock