#8 Tsunami
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Transcript of #8 Tsunami
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Tsunami
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Groupsarealmostdone Groups8and9arethetwogroupsof3
Group10 HaitiEarthquakeGroup14 LakeNyosGroup15 Mt.EyjafjallajkullGroup18 OklahomaTornado
TopicsdueThursday
GSC350NaturalDisasters
Thesegroupsneed1moreperson,pleaseapplyfortheposition
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Firstmidtermaweekfromtoday
WillcoverALLmaterialuptoThursdayslecture Knowterms,diagrams,andconcepts
ReviewsummaryonThursday Bringascantron (882)
GSC350NaturalDisasters
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Tsunami Japaneseforharborwave Notatidalwave(notrelatedtotides) Notrelatedtoharborbutcharacterizedfromharbors
Originatefromadisplacementofwater Whatdisplaceswater?
GSC350NaturalDisasters
Earthquake Landslide Asteroid Impact
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GSC350NaturalDisasters
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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GSC350NaturalDisasters
EarthquakeGenerated
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Landslides(ormassdisplacement)canoccuraboveandbelowwatersurface
Wewilldiscussthismorewhencoveringlandslides(aswillGroup#16)
Submarinelandslidesoccurandhavebeenvisualized*(thesedisplacelargeamountsofwaterneartheseafloor)*Seepage109ofyourbook
GSC350NaturalDisasters
Landslide Generated
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GSC350NaturalDisasters
Landslide Generated
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GSC350NaturalDisasters
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
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Aftertsunamiinitiates,ittravels Fasterindeepwater Slowerinshallowwater
Wavelength Distancebetweencrests WavePeriod Timebetweencrests
WaveHeightAmplitude ofcrests
GSC350NaturalDisasters
Movement
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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
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Whenatsunamistrikesland,itrushesinlandanddispersesenergy
Runup Themaximumelevationtsunamiwaterreachesonshore
GSC350NaturalDisasters
Onshore
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Whatcankillyouinatsunami?
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Exercise#19 Ihighly suggesttoreaditbeforehand Understandgeologictime(figure19.2)
Howdowedefineafaultasactive? CrossCuttingRelationships
Tocutthroughsomething,thatsomethinghadtobetherefirst
Ifafaultbreaksalavaflowthatis6,000yearsold,thenthefaulthasbeenactivewithinthepast6,000years
Yourexamwillincludepracticesfromyourexercises(askquestions!)
GSC350NaturalDisasters
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