EESA06H3 Chapter Notes - Chapter 11: Thrust Fault, Convergent Boundary, Shear Stress

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25 Apr 2012
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Structural geology: branch of geology concerned with the shapes, arrangement, and interrelationships of bedrock units and the forces that cause them. Strain- the change in size, shape or both in response to stress. Compressive stress- something being pushed together or squeezed from opposite directions. It"s common along convergent plate boundaries and typically results in rocks being deformed in a shortening strain. Tensional stress- caused by forces pulling away from each other. Results in the stretching or extension of material. Shear stress- produced when stresses act parallel to a plane. Results in shear strain parallel to the direction of the stresses, occurs on active moving faults. Elastic- if something recovers from a stress or strain and returns to its original state then it is elastic. Elastic limit- rocks are elastic until they reach their elastic limit, at which point they will deform permanently.

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