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Earthquakes and Siesmic waves

Teacher: Mrs. LaVelle
Across
Stretches rock so that it becomes thinner in the middle
A number that geologists assign to an earthquake based on the size
A rating system that estimates the energy released by an earthquake
Move more slowly but cause more ground movements
Seismic waves that vibrate from side to side as well as up and down
The shaking that results from the sudden movement of rock along a fault
An instrument that records and measures waves
Down
A force that acts on an area of rock to change its shape
Squeezes rock until it folds or breaks
Pushes mass of rock in two opposite directions
The point on the surface directly above the focus
Assigns a magnitude number to an earthquake based on size of waves
Seismic waves that compress and expand the ground like an accordion
Developed to rate earthquakes according to their intensity
The area beneath earths surface where rock that is under stress breaks, triggering an earthquake