ELAJ+2-2

toc __Back to Home Page__ =Section 2 Measuring Earthquakes=

Vocabulary

 * focus**- the place in earth's crust where rock breaks
 * epicenter**- something that is on the surface above the focus
 * seismic waves**- vibrations that are traveling though out the earth releasing energy during an earthquake
 * p waves**- first earthquake waves
 * s waves**- second earthquake waves, after the p waves
 * surface waves**- the waves that moves the slowest but has the strongest shaking
 * seismograph**- a machine that records the shaking made by a seismic waves
 * magnitude**- the way of measuring how strong an earthquake is
 * mercalli scale-** a scale made to measure earthquake by looking at how strong the damage was
 * richter scale**- a scale rating how big the seismic waves are
 * moment magnitude scale**- a scale that guesses how much energy is let out

Siesmic Waves

 * Primary Waves which are also called P waves
 * Secondary Wave which are also called S waves
 * Surface Waves

Measuring Earhquakes

 * Mercalli Scale
 * Richter Scale
 * Moment Magnitude Scale

Locating The Epicenter

 * Scientists draw three circles to find the epicenter


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