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Measuring Earthquake

Inside Earth: Chapter Two, Section Two

TermDefinition
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 focus.
seismic waves a vibration that travels through Earth carrying the energy released during an earthquake.
P waves a type of seismic wave that compresses and expands the ground; primary.
S waves a type of seismic wave that moves the ground up and down or side to side; secondary.
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 their intensity and how much damage they cause.
Richter scale a scale that rates seismic waves as measured by a particular type of mechanical seismograph
moment magnitude scale a scale that rates earthquakes by estimating the total energy released by an earthquake; the scale commonly used today.
Created by: wtr6thscience
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