Hydrofracture measurement of principal stresses along the San Andreas fault at a depth of > 600 m in a drill hole by Zoback et al. (1980) yielded a value for σ3 of 141 bars and for σ1 of 258 bars. Determine the value of maximum shear stress at the point.
San Andreas fault is a vertical right lateral strike slip fault
We know that, in strike slip fault
Maximum principal stress act horizontal and along to fault plane
Minimum principal stress act horizontal and perpendicular to fault plane
Intermediate principal stress act vertically
So maximum shear stress in vertical strike slip fault = maximum principal stress ie = 258bars
Hydrofracture measurement of principal stresses along the San Andreas fault at a depth of > 600...
Hydrofracture measurement of principal stresses along the San Andreas fault at a depth of > 600 m in a drill hole by Zoback et al. (1980) yielded a value for σ3 of 141 bars and for σ1 of 258 bars. Determine the value of maximum shear stress at the point. This is all of the info given.