CJKN+2.2

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Vocabulary
Focus:the point beneath Earth's surface where rock that is under stress breaks, triggering an earthquake Epicenter:the point on the surface directly above the focus Seismic waves:vibrations that travel through Earth's surface carrying the energy released during an earthquake P waves (primary waves):earthquake waves that press and expand the ground like an accordion S waves (secondary waves):earthquake waves that vibrate from side to side as well as up and down movement Surface waves:are formed from some p and s waves when they hit the surface Seismograph:a machine that records the ground movement caused by seismic waves as they move through the Earth Magnitude : A measurement of Earthquake strength based on seismic waves and movement along faults Mercalli scale: It rates earthquakes according to their intensity Richter scale:It rates the size of seismic waves as measured by a particular type of mechanical seismograph Moment magnitude scale:A rating scale system that estimates the total energy released by an earthquake

Outline

 * Seismic waves
 * primary waves (P waves)
 * secondary waves (S waves)
 * surface waves
 * Detecting Seismic Waves
 * uses seismograph
 * Measuring Earthquakes
 * The Mercalli Scale
 * The Richter Scale
 * The Moment Magnitude Scale
 * Locating the Epicenter
 * finds epicenter by calculating distance between p waves and s waves