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Grade Six Earthquake

Vocabulary from Prentice Hall Earth Science

TermDefinition
stress a force that acts on rock to change its shape or volume
tension stress force that pulls the rock thinner
compression stress force that squeezes rock until it folds or breaks
shearing stress that pushes a mass of rock in 2 opposite directions
normal fault Tension causes the hanging wall to slip down relative to the foot wall
reverse fault compression causes the hanging wall moves up relative to the foot wall
strike-slip fault rocks on either side of the fault slip past each other
anticline fold in rock that arches upward
syncline fold in rock that forms a valley
plateau large area of flat land above sea level
earthquake the shaking and movement of rock beneath Earth's surface
focus area beneath Earth's surface where rock under stress breaks triggering an EQ
epicenter The point on the surface of the Earth directly above the focus.
P waves Seismic waves that are the first to arrive - primary waves
S waves Secondary seismic waves
surface waves slower moving seismic waves that roll along the surface causing a lot of damage
magnitude size of the earthquake
aftershock an earthquake that occurs after a larger earthquake in the same area
tsunami water displaced by an earthquake causing a large wave
Created by: pkolarich
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