GLG310 Structural Geology. 18 March 2016GLG310 Structural Geology.

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GLG310 Structural Geology

18 March 2016GLG310 Structural Geology

 is measured positive counterclockwise from  1 to the normal to the surface of interest

18 March 2016GLG310 Structural Geology

18 March 2016GLG310 Structural Geology Christian Otto Mohr (October 8, 1835 – October 2, 1918) was a German civil engineer. In 1882, he famously developed the graphical method for analysing stress known as Mohr's circle and used it to propose an early theory of strength based on shear stress.

Faults, stress, and tractions Mohr Circle Graphical construction that lets us visualize the relationship between the principal stresses and tractions on a boundary (like a fault).  measured positive counter clockwise from  1 direction to normal of plane of interest 2  measure positive counter clockwise from  n direction on Mohr circle

18 March 2016GLG310 Structural Geology

18 March 2016GLG310 Structural Geology

18 March 2016GLG310 Structural Geology

18 March 2016GLG310 Structural Geology Movie

Using both the Mohr circle and the fundamental stress equations, determine the normal and shear tractions on the two planes. For Mohr circle, use 1 cm = 10 MPa) N40E

GLG310 Structural Geology

18 March 2016GLG310 Structural Geology

-Davis and Reynolds Faults, stress, and tractions

GLG310 Structural Geology -Engelder, 1993, Stress regimes in the lithosphere, Princeton Univ. Press