Vocabulary#13 Earthquakes

Fault:A huge crack in the crust,at or below the surface,the sides of which may show evidence of motion.
S:Faults are huge cracks in the crust.

Focus:The point where an earthquake starts,where rocks begin to slide past each other.
S:The focus is usually below the surface.

Seismic wave:a vibration that spreads out away from a focus when an earthquake happens.
S:The vibrations travel through the crust in seismic waves.
 
Epicenter:The point on Earth`s surface directly above the focus.
S:The epicenter that people can feel the ground shaking.

Aftershock:The shaking of the crust after the initial shaking of an earthquake.
S:Aftershocks continue the damage of an earthquake.

Seismograph:A sensitive device that detects the shaking of the crust.
S:Seismograph is a tool to detects the shacking of the crust.

Magnitude:The amount of energy released by an earthquake.
S:The Richter Scale rates earthquakes from 1 to 10 according to magnitude.