Transcript Earth`s Crust in Motion

Earth’s Crust in Motion
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I. Earthquakes
– A. The shaking that results from movement
of rock beneath the Earth’s surface.
– B. Rocks along faults are pushed or pulled
against each other due to stress.
– C. Friction causes stress to build up as the
rock resists movement.
– D. When the rocks finally move, it is
suddenly, and releases lots of energy.
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II. Types of Stress
– A. Shearing
 1. Pushes rock in opposite directions.
– B. Tension
 1. Pulls rock apart.
– C. Compression
 1. Pushes rock together.
– D. All three cause deformation, or a change
in the earth’s crust.
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III. Types of Faults
– A. Strike-slip Fault
 1. Caused by shearing
 2. Rocks slip past each other sideways
– B. Normal Fault
 1. Caused by tension
 2. Rock on top of the fault slips downward
– C. Reverse Fault
 1. Caused by compression
 2. Rock on top of the fault pushes up
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http://www.iris.edu/gifs/animations/faults.htm
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http://www.classzone.com/books/earth_science/terc/con
tent/visualizations/es1103/es1103page01.cfm?chapter_n
o=visualization