study guide chap12

study guide chap12 - GLG111.D Study Guide SPRING 2009...

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GLG111.D Study Guide SPRING 2009 Chapter 12: Earthquakes and Earth’s Interior, p. 330-365. Define the following terms . Compressive Force: Action of oppositely directed forces acting towards each other at the same time Tensional Force: Action of coinciding and oppositely directed forces acting away from each other Shearing Force: Action of coinciding and oppositely directed forces acting parallel to each other across a surface. Earthquake: Vibrations caused by the sudden release of energy, usually as a result of the displacement of rocks along faults. Fault: A fracture along which movement has occurred parallel to the fracture surface. Dip-Slip fault- Motion of the fault blocks is in an up or down direction along the fault plane. Normal: hanging wall moves down (tension) (divergent plate boundaries) Reverse: hanging wall moves up (compression) (convergent plate boundaries) Strike-Slip fault- Motion of the fault blocks is side-to-side along fault plane. Left-lateral: If you are standing on the vertical line looking across the fault, where is the
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study guide chap12 - GLG111.D Study Guide SPRING 2009...

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