GEO 120 Lecture Notes - Lecture 7: Thrust Fault, Seismic Wave, Seismometer
28 Sep 2016
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Geo 120 - lecture 7 - earthquakes - elizabeth laliberte. Vibration of the earth produced by the rapid release of energy. Stress- the force applied to an object. Elastic- remove stress, returns to original shape. Plastic- deformation remains even if stress is removed. Focus- the location of the source of energy. Epicenter- the location on the earth"s surface directly above the focus. Normal fault (dip slip)- hanging wall moves down with respect to the footwall. Thrust fault (dip slip)- the hanging wall goes up the wall (reverse) Strike-slip fault- blocks move past each other. Body waves (p waves and s waves)- go through the earth. P (primary) waves- first ones recorded, compressional waves, travel fast, can travel through solids, liquids and gases. S (shear/secondary) waves- recorded second, travel slower than p waves, travel through solids only. 3 seismic stations are needed to determine the epicenter of the earthquake. Intensity-measure of an earthquake"s effect on people and buildings.
