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 transcript:

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

Peridotite

Eclogite

Does peridotite or eclogite fit the enterior?

Need high pressure experiments Principle is to generally reduce surface area

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

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

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

Does peridotite or eclogite fit the enterior?

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

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)

Seismic tomography

CAT Scan (uses x-rays)