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1、Unit6SectionAHowtoPrepareforEarthquakeI.Backgroundinformation1.The1906SanFranciscoEarthquakeAt5:13onthemorningofApril18th,1906,thecityofSanFranciscowasshakenbyaterribleearthquake.Alargepartofthecitywasdestroyedandalargenumberofbuildingswereburnt.Thenumberofpeoplewholosthomesreachedasmanyas250,000
2、.About700peoplediedintheearthquakeandthefires.AnotherearthquakeshockedSanFranciscoonOctober17th,1989.Itwasthesecondstrongestearthquakeandaboutonehundredpeoplewerekilled.Ithappenedintheeveningaspeopleweretravelinghome.Awideandbusyroadfellontothebelow.Alotofpeoplewerekilledintheircars,butafewluckyo
3、neswerenothurt.Luckilythe1989earthquakedidnothappeninthecenteroftownbutabout50kilometersaway.Inonepartofthetownmanybuildingsweredestroyed.Thesebuildingswereover50yearsold,sotheywerenotstrongenough.Therewerealotoffiresalloverthecity.Theelectricitywascutoffforseveraldaystoo.Scientistsexplainthatthe
4、outsideoftheearthismadeofdifferentplates.AtSanFranciscothePacificplatemeetstheNorthAmericanplate.Whensuddenlythesetwoplatesjump,anearthquakeisfelt.Whenthe1906earthquakehappened,thePacificplatejumped5-6meterstothenorth.Wecannotstopearthquake,butwecandothingstomakesuretheydonotdestroyawholecity.Fir
5、st,itisnotagoodideatobuildhousesalongthelineswheretwooftheearth’splatesjointogether.Second,ifyouthinktheremaybeanearthquake,itisbettertobuildhousesonrocknotonsand.Third,youmustmakethehousesasstrongaspossible.Weakbuildingswillfalldowninanearthquake,butstrongonesmaystayup.Scientistsareafraidthatone
6、dayanevenbiggerearthquakewillhittheareaaroundSanFrancisco.Theycallit“TheBigOne”.However,peopletodayarestillbuildingmorehouses.ThepopulationinandaroundSanFranciscoisnowtentimesmorethanitwasin1906.Thismeansthatifthereisanotherbigearthquake,agreatmanyhousesandbuildingswillbedestroyed.2.The1976Tangsh
7、anEarthquake1)Whichcityearnsthename“BraveCityofChina”?Tangshan82)Thedeadliestearthquakeofthe20thcentury,amagnitude7.8earthquakehitthesleepingcityofTangshanat3:42a.m.onJuly28,1976.3)Whichofthefollowinggavesomeadvancewar
