movements of the ground caused by sudden releases  of energy when rocks along a fault move

• Earthquake
• Tsunami
• Magnitude
• Seismogram

the sudden return of elastically deformed rock to   its undeformed shape

• Elastic Rebound
• Elastic Return
• Elasticity
• Elastic response

the location within the Earth where the first motion of an earthquake occurs

• Focus
• Epicenter
• Magnitude
• Fault

the point on the Earth’s surface directly above the focus

• Focus
• Epicenter
• Magnitude
• Fault line

seismic waves that travel through the Earth’s layers

• Body wave
• Surface wave
• Medium Wave
• Magnitude wave

seismic waves that travel across the outer portion of Earth

• Surface wave
• Body wave
• Exterior waves
• Outside waves

compression waves, the first waves of an earthquake to be detected

• P Waves
• S Waves
• Shear waves
• Perfunctory waves

shear waves, the second waves of an earthquake to be detected

• S Waves
• P waves
• Primary waves
• Sharp waves

locations on Earth’s surface where no body waves from a particular earthquake can be detected

• Seismic gap
• Shadow zone
• Seismic anomoly
• Secondary gap

the instrument used to detect and record vibrations   in the ground

• Seismograph
• Seismogram
• Seismopic
• Seismic wave