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PREM = Preliminary Reference Earth Model So what is the Earth’s interior made of? Look for rocks at surface with Vp ~ 8 km/s and density ~ 3.5 km/s.

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Presentation on theme: "PREM = Preliminary Reference Earth Model So what is the Earth’s interior made of? Look for rocks at surface with Vp ~ 8 km/s and density ~ 3.5 km/s."— Presentation transcript:

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2 PREM = Preliminary Reference Earth Model

3 So what is the Earth’s interior made of? Look for rocks at surface with Vp ~ 8 km/s and density ~ 3.5 km/s

4 Peridotite

5 Eclogite

6 Does peridotite or eclogite fit the enterior?

7 Need high pressure experiments Principle is to generally reduce surface area

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

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

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

11 Does peridotite or eclogite fit the enterior?

12  = olivine  = wadsleyite  = ringwoodite 1 kbar ~ 3 km 1 GPa ~ 30 km

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14 Short dashed = observed Long dashed = (Mg 0.9 Fe 0.1 ) 2 SiO 4 at1700 K Solid line = (Mg 0.9 Fe 0.1 ) 2 SiO 4 at 2000 K Bina & Wood (1987)

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17 Seismic tomography

18 CAT Scan (uses x-rays)

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