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Earthquakes

QuestionAnswer
stress forces per unit of area on a material
compression stress pressing inwards; decreases volume
tension stress pressing outwards; pulls material apart
shear stress that causes material to twist
strain deformation of materials in response to stress
fault fracture or system of fractures along which movement occurs; results from stress and strain
focus point where earthquake originates
epicenter point on Earth’s surface directly above the focus; most damage done here
P-Waves Primary waves squeeze and pull rocks; fastest waves; travel through liquids and solids
S-Waves Secondary waves cause rocks to move at right angles; slower waves; travel through solids only
Long Waves T-Waves or surface waves; slowest waves; travel along the Earth's surface
seismogram record (picture) of the seismic waves; analyzed to find epicenter and damage
Created by: mschrismon
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