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GEOL105 (163)
Dr.Ed Kohut (115)
Lecture 8

GEOL105 Lecture 8: GEOL105 Lecture

4 Pages
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Department
Geology
Course Code
GEOL105
Professor
Dr.Ed Kohut

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Description
220 Earthquakes What is an earthquake? o Energy traveling through the earth as vibrations Causes o Movement along faults o Volcanic eruptions o Explosions o Impacts Faults and quakes o Fault: fracture in the crust along which there has been movement (displacement) o Stress in the crust can cause Blocks of crust along a fault to move Energy in moving fault blocks causes vibrations If the movement is sudden and rapid, strong vibrations (seismic waves) result Earthquake! Fault orientation o Geologists need a way to describe how a fault is oriented in space o Strike: direction of an imaginary horizontal line on surface o Dip: angle of a surface from horizontal 090, 90 is vertical Type of faults o Classified by movement direction o Movement direction depends on the type of stress in crust o Normal Faults Vertical or near vertical movement (dip slip) Tension (stress pulling away from fault) Hanging wall moves DOWN, Footwall UP o Reserves or thrust fault
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