8th Grade Science: Earthquake Waves
shaking and vibration of Earth's surface usually caused by the sudden movement of Earth's crust along a fault or by a volcano
the point on Earth's surface directly above the focus, or origin, of an earthquake
a fracture in Earth's crust where the rocks on either side have moved
the point within Earth where an earthquake originates. Also known as the hypocenter
vibrations that transmit energy as they move through Earth materials.
a seismic wave that travels through Earth's interior
the fastest type of body wave produced by earthquakes. Theses waves are longitudinal or compression waves.
a slower type of body waves that are produced by earthquakes. These waves are transverse waves in which material moves up and down perpendicular to the direction that the wave is moving.
a seismic wave that travels along Earth's surface
a graphical record of ground vibrations
an instrument that measures and records ground vibrations
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