GEOL
Assignment 4

# Assignment 4 - Assignment 4 1 A Define a fault and describe...

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Assignment 4 1. A) Define a fault and describe a normal fault and a reverse fault. A fault is a fracture in the earth where the sides of the fracture move past each other, one above and one below. A normal fault is when the hanging wall moves down past the footwall. A reverse fault is when the hanging wall moves upward relative to the footwall B) How do dip-slip faults differ from strike-slip faults? A dip-slip fault is when the movement along the fault is vertical. A strike-slip fault is when the movement along the fault is horizontal. C) Define stress and strain. Stress is force that is place on an object from an external source. Strain is the change on form that the object goes through as a result of stress. 2. A) Explain how a seismograph is constructed so that it accurately records seismic waves. The seismograph is constructed so that there is a steady part, the frame, that stays still when the earth is still and moves when the earth moves. A heavy mass is suspended from the frame, and because of inertia, the heavy mass doesn’t move when the frame moves, which allows it to record the movements of the frame. The difference between the motion of the frame and the heavy mass are recorded on a piece of paper which illustrate the seismic waves.

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• Spring '09
• Berelson
• Rayleigh waves

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