GLG310 Structural Geology

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Presentation transcript:

GLG310 Structural Geology Welcome to our class. This is GLG310 and I am Ramon Arrowsmith. GLG310 Structural Geology

GLG310 Structural Geology Today’s plan Continue Force, Stress, and Strength (Chapter 3) [continue reading Chapter 3] Be sure to cross reference the lecture and the textbook Stretch a bit into faults and stress 17 April 2017 GLG310 Structural Geology

Classification of faults 17 April 2017

GLG310 Structural Geology Fracture 17 April 2017 GLG310 Structural Geology

Andersonian Faulting Theory Key assumptions: Earth’s surface is a free surface (so it has no shear tractions acting along it). Therefore, s1, s2, s3 must be either parallel or perpendicular to it. A fault will slip in the direction of maximum resolved shear traction 17 April 2017

By E. M. Anderson (1st ed. 1942, 2nd ed. 1951)

Andersonian Faulting Theory

Andersonian Faulting Theory Rowland and Duebendorfer 17 April 2017 GLG510 Advanced Structural Geology

Andersonian Faulting Theory

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

GLG310 Structural Geology Relative stress magnitudes and faulting regimes (from Reservoir Geomechanics by Zoback--http://www.amazon.com/Reservoir-Geomechanics-Mark-D-Zoback/dp/0521770696) 17 April 2017 GLG310 Structural Geology

17 April 2017

World Stress Map http://www.world-stress-map.org/ 17 April 2017

North America Stress Map http://www.world-stress-map.org/ North America Stress Map