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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