Geology 112

 
 

 
 

 
 

 
 
 
 
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Flap 1 Flap 2
Def. PeridotiteRock carried up to surface by lava
Earths Average density?5.5 t/m3
Crusts average density?2.7 t/m3
Def FocusPoint where breaking rocks occur on the fault
Def. EpicenterPoint 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