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Measuring Earthquakes

Chapter 2;Section 2
STUDY
PLAY
Focus
The point beneath Earth's surface where rock breaks under stress and causes an earthquake
Epicenter
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
Seismograph
A device that records ground movements caused by seismic waves as they move through Earth
Magnitude
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
Scale
A scale that rates earthquakes by estimating the total energy released by an earthquake