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ID:52000190
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时间:2020-03-21
《日本地震导致地球自转加快英文材料.doc》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、JapanQuakeShortensEarthDayJapan'sdevastating9.0・magnitudeearthquakelastFridaywassopowerfulthatexpertssayitslightlyincreasedtheEarth'srotationspeed,makingthedayafractionofasecondshorter.U.S.spaceagencyscientistRichardGrosssaidthequakeshiftedthewaytheEa
2、rth'smassisdistributed,whichmadetheplanetspinalittlefaster,cuttingthe24-hourdaybyanestimated1.8microseconds.Thatislessthantwomillionthsofonesecond.Thescenarioislikethatofafigureskaterwhodrawsherarmsintoherbodyduringaspin,inordertoturnfasterontheice.Th
3、eshiftintheearth'smasswasalsoseeninsurfacechangestotheJapanesecoastline,causedbythesuddenslippageofcollidingplatesoftheearth"scrustfarbelow・Globalpositioningstationsclosesttotheepicentermovedeastwardbyupto4metersduringthequake.Lastyear's8.8・magnitudee
4、arthquakeinChile,andthe9.1-magnitudequakethatstruckIndonesiain2004eachcutseveralmicrosecondsfromthelengthoftheEarth'sday・ItisnormalforthelengthofadayonEarthtovarybyabout1.000microseconds(onemillisecond)throughouttheyear.TheU.S.GeologicalSurveysaysthee
5、arthquakeinJapanwastheworld'sfifth-largestsince1900.
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