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1、EarthquakesTheruptureandsuddenmovementofrocksalongafault.6.1EarthquakesandPlateBoundariesAfaultisafracturesurfacealongwhichrockscanslip.MajorityofearthquakesoccurinEarth’scrust.Partoftheenergyreleasedfromearthquakesspreadsascomplexwaves.ElasticStrainEnergyElasticstrainistheen

2、ergystoredasamaterialchangesinshape.6.1EarthquakesandPlateBoundariesWhenrockscannolongerchangeshape—thefaultbreaksandslips,causingearthquakes.ElasticStrainEnergy(cont.)6.1EarthquakesandPlateBoundariesFocusThefocusisthelocationonthefaultwhereanearthquakebegins.6.1Earthquakesan

3、dPlateBoundariesThecloserthefocusistothesurface,thestrongertheshakingwillbe.EpicenterThepointonEarth’ssurfacedirectlyabovetheearthquake’sfocus.6.2EarthquakesandSeismicWavesFaultZonesPlateboundariesareusuallymadeofmultiplefaultscalledzonesthatare40–200kmwide.6.1EarthquakesandP

4、lateBoundariesPlateBoundariesandEarthquakesLithosphericplatesinteractatdifferentplateboundariesandproduceearthquakes.6.1EarthquakesandPlateBoundariesEarthquakesizeanddepthandfaulttypedependonthetypeofplateboundary.PlateBoundariesandEarthquakes(cont.)6.1EarthquakesandPlateBoun

5、dariesEarthquakesAwayfromPlateBoundaries6.1EarthquakesandPlateBoundariesEarthquakesAwayfromPlateBoundaries(cont.)6.1EarthquakesandPlateBoundariesNewMadrisEarthquakesof1911Millionsofyearsago,alongzoneofintensefaultingwasformedwhenthecrustbegantopullapart,butdidnotbreakcomplete

6、ly.Today,thecrustisbeingcompressed,orsqueezedtogether.(p.246)Lesson1ReviewStrike-slipfaultsoccuratwhattypeofplateboundary?AconvergentplateboundaryBtransformplateboundaryCdivergentplateboundaryDsubductionplateboundary6.1EarthquakesandPlateBoundariesLesson1ReviewThefocusofanear

7、thquakeis____.AwhereanearthquakeisfirstfeltonthesurfaceofEarthBwhereanearthquakedissipatesCwherethefaultandaplatemeetDwhereanearthquakebegins6.1EarthquakesandPlateBoundariesLesson1ReviewWhichboundaryisassociatedwithearthquakesthatoccuratrelativelyshallowdepthsandaresmallinsiz

8、e?AdivergentplateboundaryBconvergentplateboundaryCtransformplateboun