GLY 1010 Lecture 19: GEOLOGY FINAL NOTE REVIEW
Document Summary
Earthquakes do not occur at random but form linear belts. They occur when rocks suddenly break along a new or preexisting fault. Seismic waves are generated that can be destructive. Epicenter--- the point on the earth"s surface directly above the focus. Between earthquakes, stress builds up in the earth. Friction locks the fault until stress builds up to cause slip. This hypothesis was developed from the 1906 san francisco earthquake. The amount of displacement of the fault is shown by the offset in the fence. Seismic waves --- originate at the focus and are detected by seismographs. Body waves --- p & s waves, they move fast and go far. Surface waves --- these waves ripple across the earth"s surface, move slowly and cause damage. P-waves --- travel fast through solid rock and liquid, particles expand and contract as the wave moves.
