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Breezie's ch 6 vocab

plate a large section of earths crust and rigid upper mantle that moves around on the athenosphere.
fault surface along which rocks move when they pass their elastic limit and break.
earthquake vibrations produced when rocks break along a fault.
normal fault break in rocks caused by tension forces, where rock above the fault surface moves down realative to the rock below the fault surface.
reverse fault break in rock caused by compressive forces, where rock above the fault surface moves upward.
strick-spil fault break in rock caused by shear forces, where rocks move past each other without much vertical movement.
wave rythmic movement that carries energy through matter and space.
seismic wave wave generated by an earthquake.
focus in an earthquake, the point below Earth's surface where energy is released in the form of seismic waves.
primary wave seismic wave that moves rock particles back-and-forth in the same direction that the wave travels.
secondary wave seismic wave that moves rock particles at right angles to the direction of the wave.
surface wave seismic wave that moves rock particles up-and-down in a backward rolling motion and side-to-side in a swaying motion.
epicenter point on Earth's surface directly above an earthquake's focus.
seismorgraph instrument used to register earthquake waves and record the time that each arrived.
crest the highest point of a wave.
magnitude measure of the energy released durring an earthquake.
liquefaction occurs when wet soil acts more like a liquid durring an earthquake.
tsunami sesimic sea wave that begins over an earthquake focus and can be highly destructive when it crashes on shore.
Created by: breezie-f-baby