#8 Tsunami

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A powerpoint about Tsunamis and their effects.

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  • Tsunami

  • Groupsarealmostdone Groups8and9arethetwogroupsof3

    Group10 HaitiEarthquakeGroup14 LakeNyosGroup15 Mt.EyjafjallajkullGroup18 OklahomaTornado

    TopicsdueThursday

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    Thesegroupsneed1moreperson,pleaseapplyfortheposition

  • Firstmidtermaweekfromtoday

    WillcoverALLmaterialuptoThursdayslecture Knowterms,diagrams,andconcepts

    ReviewsummaryonThursday Bringascantron (882)

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  • Tsunami Japaneseforharborwave Notatidalwave(notrelatedtotides) Notrelatedtoharborbutcharacterizedfromharbors

    Originatefromadisplacementofwater Whatdisplaceswater?

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    Earthquake Landslide Asteroid Impact

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    Mostcommonduetoreversemotionatsubductionzones Whythisfaulttype?

    Whenashallowearthquakeoccurs,seafloormovesanddisplaceswater

    Tsunamisizedependentonrupturesize,length,andarea

    EarthquakeGenerated

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    EarthquakeGenerated

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    EarthquakeGenerated

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    EarthquakeGenerated

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    EarthquakeGenerated

  • Landslides(ormassdisplacement)canoccuraboveandbelowwatersurface

    Wewilldiscussthismorewhencoveringlandslides(aswillGroup#16)

    Submarinelandslidesoccurandhavebeenvisualized*(thesedisplacelargeamountsofwaterneartheseafloor)*Seepage109ofyourbook

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    Landslide Generated

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    Landslide Generated

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    Landslide Generated

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    Landslide Generated

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    Landslide Generated

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    ImpactGenerated Whilechancesarelow,itisstillapossibility Displacementofwateratveryhighvelocities

    1kmhighwavespossibledependentonvarietyoffactors Depthofwater Sizeofimpact

    Notamajorhazardduetofrequency

    Othersourcesmuchmorelikely

  • Aftertsunamiinitiates,ittravels Fasterindeepwater Slowerinshallowwater

    Wavelength Distancebetweencrests WavePeriod Timebetweencrests

    WaveHeightAmplitude ofcrests

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    Movement

  • Velocityisafunctionofdepth

    C=gD

    C=Velocityinmeterspersecondg=accelerationduetogravity(9.8m/s2)D=Depthinmeters

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    Movement

    C =9.8(1200) C =108.4m/s D=1200m?

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    Movement

  • Whenatsunamistrikesland,itrushesinlandanddispersesenergy

    Runup Themaximumelevationtsunamiwaterreachesonshore

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    Onshore

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    Whatcankillyouinatsunami?

  • Exercise#19 Ihighly suggesttoreaditbeforehand Understandgeologictime(figure19.2)

    Howdowedefineafaultasactive? CrossCuttingRelationships

    Tocutthroughsomething,thatsomethinghadtobetherefirst

    Ifafaultbreaksalavaflowthatis6,000yearsold,thenthefaulthasbeenactivewithinthepast6,000years

    Yourexamwillincludepracticesfromyourexercises(askquestions!)

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