资源描述：
《四六级_作文_阅读_天下无敌_过关宝典》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、地震Whatisearthquake? Anearthquakeistheresultofasuddenrelease释放ofenergy能量intheEarth'scrust地壳thatcreates创建seismic因地震引起的waves(地震波).Earthquakesarerecordedwithaseismometer(地震检波器),alsoknownasaseismograph(地震仪).Themomentmagnitude震级ofanearthquakeisconventionally照常例reported,ortherelated有关的andmostly主要的obsolet
2、e老式的Richtermagnitude(里氏量级),withmagnitude3orlowerearthquakesbeingmostlyimperceptible感觉不到的andmagnitude震级7causing导致seriousdamageoverlargeareas.Intensity强度ofshaking震动ismeasured测量onthemodifiedMercalliscale(麦加利震级,麦氏震级). AttheEarth'ssurface,earthquakesmanifest明显的themselvesbyashakingandsometimesdisplaceme
3、nt(位移)oftheground地面.Whenalargeearthquakeepicenter(震中)islocated位于offshore海上,theseabed海底sometimessuffers遭受sufficient充分的displacement位移tocause造成atsunami(海啸).Theshakinginearthquakescanalsotrigger引发landslides山崩andoccasionally间或volcanic火山activity活动. Initsmostgeneric一般的sense感觉,thewordearthquakeisusedtodes
4、cribe形容anyseismicevent—whetheranaturalphenomenon现象oraneventcausedbyhumans—thatgeneratesseismicwaves.Earthquakesarecausedmostlybyrupture(破裂,裂开)ofgeological地质faults(断层),butalsobyvolcanicactivity,landslides,mine矿山blasts爆炸,andnuclear核exploded爆炸.Anearthquake'spointofinitial最初的rupture破坏iscalleditsfocus中心
5、orhypocenter震源.Theterm术语epicenter震中meansthepointatgroundleveldirectlyabovethis.地震防范GetpreparedforthepossibilityofagreatearthquakeInyourday-to-day日常生活living,earthquakemayseemadistant远possibility.Yetnaturaldisasters灾难suchasgreatearthquakecanstrike打击anycommunity社区,includingyours,atanytime.Ifyou'reunpr
6、eparedforadisaster,itcanshatter毁灭,破坏yourlife.Thenbeforetheearthquakestrikes,whatshouldwedo?It’saseriousquestionwehavetodiscuss.First,youandyourcommunityneedtodevelopstrongerbuildingcodes.Buildingcodes规范arethepublic'sfirstlineofdefense抵御againstearthquakes.Thecodesspecifythelevelsofearthquakeforcesth
7、atstructures结构,建筑物mustbedesignedtowithstand抵挡,禁得起.Second,pleasedevelopaFamilyDisasterPlantoletyourandyourfamilygain增加themastery掌握ofEarthquakeandknowhowtotakeprecautions防范against防备earthquake.Beforeagreateart
