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Chapter 2;Section 2


The point beneath Earth's surface where rock breaks under stress and causes an earthquake


The point on Earth's surface directly above an earthquake's force

Seismic Waves

A vibration that travels through Earth carrying the energy released during and earthquake

P waves

A type of seismic wave that compresses and expands the ground

S waves

A type of seismic wave that moves the ground up and down or side to side

Surface waves

A type of seismic wave that forms when P-waves and
S-waves reach Earth's surface


A device that records ground movements caused by seismic waves as they move through Earth


The measurement of an earthquake's strength based on seismic waves and movement along faults

Mercalli Scale

A scale that rates earthquakes according to theri intensity and howmuch damage they cause

Richter Scale

A scale that rates seismic waves as measured by a particular type of mechanical seismicgraph

Moment Magnitude

A scale that rates earthquakes by estimating the total energy released by an earthquake

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