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Geology 112

1.3 Look at structure of earth

QuestionAnswer
Def. Peridotite Rock carried up to surface by lava
Earths Average density? 5.5 t/m3
Crusts average density? 2.7 t/m3
Def Focus Point where breaking rocks occur on the fault
Def. Epicenter Point on surface directly above focus
P-Wave? Subsurface primary wave
S-Wave? Subsurface secondary wave
Shock wave velocity? increases with rigidity, decreases with density
What happens to shockwaves at boundaries within the earth? they get refracted
The asthenosphere? 'low velocity zone' 100 - 300kms deep
Created by: shiftyleigh