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1、Unit4Earthquake（一）惨痛的记忆：中国历史上的大地震1556:Shaanxi,China明代陕西大地震Thedeadliestquakeofalltimemightbeoneoftheleasttalkedabout,consideringitoccurrednearly450yearsago.The1556quakeclaimedthelivesofsome830,000people.Whythemassivedeathtoll?Blamethequake'sstrength(8.0ontheRichterscale,ormorethan30ti
2、mesmorepowerfulthantherecentquakeinHaiti)aswellastimingandlocation.Thepre-modernstructureswereutterlyunabletowithstandaquakeofsuchforce,andmassivelandslidescontributedtothecasualties.历史上最可怕的地震也许是最少被谈及的一场地震,因为它发生在450年之前。这场地震导致83万人死亡。为何死亡人数如此巨大？原因在于震级（里氏8.0级,比刚发生的海地地震强30倍）,还有时间和地点。古代的房
3、屋建筑完全不能抵挡这样的大地震,大面积的山体滑坡也导致不少人遇难。1976:Tangshan,China唐山大地震Chinahasthemisfortunetohavehadtheseconddeadliestearthquakeonrecord,the1976GreatTangshanEarthquake,whichstruckinthecountry'snortheast.It'dbemoreaccuratetocallthisabinaryquake:anaftershockthatstruck16hoursaftertheinitialtemblorme
4、asuredanidentical7.8ontheRichterscaleandwasequallydestructive.继陕西地震之后,中国又发生了第二大强度的地震,1976年唐山大地震,确切来说是两次大地震：地震后16小时,里氏7.8级的余震又造成了巨大损失。1920:Haiyuan,China宁夏海原地震TheDec.16,1920Haiyuanearthquake—whichregistereda7.8magnitudeontheRichterscale—causedriverstochangecourseandsentlandslidespourin
5、gdownmountains.DestructionstretchedacrosssevenChineseprovinces.Sujiahe,atownininXijiCounty,wascompletelyburiedunderalandslide.Anestimated200,000peoplediedinthedisaster,whichwasfeltasfarawayasNorway.1920年十月十六日宁夏海原发生的里氏7.8级大地震使得河流改道,并导致山体滑坡。七省同时受灾。西吉县苏家河镇在一次滑坡中整体被埋。二十万人死于此次地震,并且震感远至挪威。
6、2008:SichuanProvince,China四川省5.12大地震The7.9-magnitudedisasterstruckthemountainousSichuanProvinceinwesternChina,destroyingmillionsofbuildingsandcausinganestimated$86billionworthofdamage.Nearly10,000childrendiedinschools—trappedunderrubblewhenthebuildingscollapsed.四川发生的这场7.9级大地震中有上百万房屋倒
7、塌,造成约860亿美元的损失。几乎有一万个孩子死在倒塌的教学楼中。（二）当地震发生时的你该如何应对？●Whenwalkingoutside行走在户外时 Takecautionagainstfallingobjects,suchassignsandbrokenwindows.Toolsandconstructionmaterialscanfalldownataconstructionsite.Protectyourheadwithyourbagorcoatandkeepatadistancefromtallbuildings.Stonewallsandpilla
8、rscanalsofal
