P1258856139KVPrl

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PREM Preliminary Reference Earth Model
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So what is the Earths interior made of?

• Look for rocks at surface with Vp 8 km/s and
  density 3.5 km/s

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Peridotite
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Eclogite
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Does peridotite or eclogite fit the enterior?
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• Need high pressure experiments
• Principle is to generally reduce surface area

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• Multi-anvil cell
• 25 GPa (700 km) and 2500 K
• Sample 1mm

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• Diamond anvil cell
• 350 GPa or so (centre of Earth)
• Very small sample (i.e. 0.1 mm)

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• Shock experiments
• Very small samples
• very little time
• 1 TP (inside of Jupiter)

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Does peridotite or eclogite fit the enterior?
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? olivine ? wadsleyite ? ringwoodite
1 kbar 3 km 1 GPa 30 km
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Bina Wood (1987)
Short dashed observed Long dashed
(Mg0.9Fe0.1)2SiO4 at1700 K Solid line
(Mg0.9Fe0.1)2SiO4 at 2000 K
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Seismic tomography
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CAT Scan (uses x-rays)
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