更新时间:2025-08-07 14:28:37
After5.12earthquakestrucksichuanprovincesince20xx,we,Iwassofrightenedbyanearthquake,Ifelttheearthquakemanyhouseswillbeapart,canletmanypeoplelosttheirlives,isoneoftheworld'smostterribledisaster.TodayIsaw"Chinachildren'sencyclopedia,reallyknowanythingaboutearthquake.
Itturnsoutthattheearthquakehappenedallofasuddenthevibrationphenomenon,likethewind,rain,isakindofcommonnaturalphenomena.Vibrationsintheearth,infact,veryfrequently,probablyevery30secondstherewillbetime,butmostofthemareveryease,peopledidnotfeel.Wecanfeeltheearthquakeisduetotherelativemovementbetweenearth'stectonicplates,rockissqueezed,produceahugeamountofenergytomakerockfailureinaninstant,ormakeoriginallythealreadyexistingfractureactivity,suddenlyreleasealargeamountofenergy,andsomeoftheenergytotheearth'ssurface,maketheearthtremblingviolently,causingstrongearthquake.Startedhappeningearthquakesiteiscalledthesource,thesourceabovethegroundiscalledtheepicenter,thegroundofthedevastatingearthquakeisthemoststrongplaceiscalledthemagistoseismicarea,whilethemagistoseismicareaoftenistheplacewheretheepicenter.Whentheearthquakeoccurred,thesourceofshockwaveintheearth'scrusttoalldirectionscalledseismicwaves.Seismicwaveshittheground,theresultwillbeadisaster.
WeChinesepeopleareverysmart,asearlyastheeasternhandynasty,thereisamannamedzhanghengscientistsinventedtomeasuretheearthquakeHouFengseismograph,andourmodernscientistsaregenerallymeasuredthespreadofseismicwavespeedwiththehelpofaseismograph,theplaceandtimeoftheearthquake.
Knowtheearthquakeknowledge,learningevenbeforetheearthquakeearlywarningandselfprotectionmethod,Ithink,toknowthatknowledgeisveryusefulforourown.
自从20xx年我们四川发生5.12大地震之后,我就特别害怕地震,我觉得地震会震垮很多房屋,会让许多人失去生命,是世界上最可怕的灾难。今天我看了《中国少年儿童百科全书》后,才真正知道地震是怎么回事。
原来,地震是突然间发生的大地震动现象,就像刮风、下雨一样,是一种很普遍的自然现象。地球上的震动实际上非常频繁,大概每30秒种就会有一次,但大多数都非常缓和,人们都没有感觉。我们能感觉到的地震是由于地球板块之间产生相对运动,岩石层受到严重挤压,产生巨大的能量使岩石在瞬间发生断裂,或者使原来已经存在的断裂突然活动,释放出大量能量,而其中一部分能量传到地球表面,使大地剧烈地颤动,从而引起强烈地震。地震开始发生的地点称为震源,震源上方的地面称为震中,破坏性地震的地面最烈处称为极震区,而极震区往往就是震中所在的地方。地震发生时,震源发出的在地壳中传向四面八方的冲击波称为地震波。地震波冲击到地面,就会引发灾难。
我们中国人非常聪明,早在东汉时期,就有一位叫张衡的科学家发明了用来观测地震的侯风地动仪,而我们现代的科学家也一般都借助地震仪来测量地震波的传播速度,判断地震发生的地点和时间。
知道了地震知识以后,还要学习地震发生前的提前预警和自我保护方法,我想,了解到这些知识对我们自己是非常有用的。
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