The Earth’s Metal Heart · 2018. 6. 22. · Rock Iron Emil Weichert. Seeing with seismology [Mike...
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The Earth’s Metal Heart Daniel A. Frost
Transcript of The Earth’s Metal Heart · 2018. 6. 22. · Rock Iron Emil Weichert. Seeing with seismology [Mike...
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TheEarth’sMetalHeart
DanielA.Frost
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Whatwethinkweknow
[Bullen,1975]
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TheSolidEarth
[EdGarnero]
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Drillingdown
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Hintsfromastronomy
Iron
Rock
Iron
EmilWeichert
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Seeingwithseismology
[MikeThorne,UoU]
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Seeingwithseismology
[Redfern]
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Seeingtheshadow
RichardOldham
98°
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Seeingtheshadow
98° 10°or1000km
RichardOldham
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Seeingtheshadow
98°
P-waveShadowZone
RichardOldham
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Outtheotherside
145°
P-waveShadow
BenoGutenberg
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Laptopseismology
145°
hNps://ds.iris.edu/wilber3/find_event
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Laptopseismology
145°
hNps://ds.iris.edu/wilber3/find_event
ShadowZone
PKP
P-wave
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Solidorliquid?
145°[MITEAPS]
P-waveShadow
S-waveShadow
HaroldJeffreys
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Howhotisthecore?-Very
145°
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Hiddeninplainsight
IngeLehmann
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Hiddeninplainsight
ShadowZone
PKP
P-wave
PʹIngeLehmann
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Hiddeninplainsight
ShadowZone
PKP
P-wave
PʹIngeLehmann
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Underpressure
[LyndonStateCollege]
FrancisBirchKeithBullen
Solid!
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Solidevidence
[HarvardSeismology]
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Solidevidence
[HarvardSeismology]
Normalmode/Freeoscilla>on
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Insideout
[AllenMcNamara]
Heatfrominnercore
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NorthPoleWilliamGilbert
EdmondHalley
FeelingtheaNrac]on
SouthPoleSouthPole
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FeelingtheaNrac]onNorthPole
WilliamGilbert
EdmondHalley
SouthPoleSouthPole
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Makingmagne]sm
WalterElsasser
Mo>onofconductorinmagne>cfield
Currentinconductor
Magne>cfield
NorthPole
SouthPoleSouthPole
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CorecrystalsNorthPole
SouthPoleSouthPole
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CorecrystalsNorthPole
Hexagonallyclose-packed
SouthPoleSouthPole
Ironatoms
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CorecrystalsNorthPole (Sandwichesareanisotropic)
SouthPoleSouthPole
Hexagonallyclose-packed
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FromtheboNomtothetop
[AndrewJackson]
Magne>cfieldstrength
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Thecore’scoat
Magne>cfieldstrength
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Thecore’scoat
Magne>cfieldstrength
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Coreques]ons
Howdoestheinnercoregrow?Howdoestheinnercoreaffectthegeodynamo?Howdoesthesurfaceaffectthecore?
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Thanksforlistening
[AllenMcNamara]
Heatfrominnercore
[MikeThorne,UoU][HarvardSeismology]
[AndrewJackson]
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Thanksforlistening
