EESA06H3 Chapter Notes - Chapter 4: Magnetotellurics, Magnetometer, Gravity Anomaly
12 Apr 2012
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Document Summary
Geophysics the application of physical laws and principles to a study of the earth. Seismic reflection the return of part of the energy of seismic waves to the earth"s surface after the waves bounce off a rock boundary. Seismic refraction the bending of seismic waves as they pass from one material to another. Crust the outer layer of rock, forming a thin skin over the earth"s surface. Felsic rocks high in feldspar and silicon continental crust. Mafic rocks high in magnesium and iron (ferric) oceanic crust. Mohorovicic discontinuity (moho) the boundary separating the crust from the mantle beneath. Mantle (670km) a thick shell of rock that separates the earth"s crust above from the core below. Upper mantle diff from continental and oceanic crust, is most likely ultramafic rock (dense igneous rock, lack felderspar ex: periodite) Lithosphere the strong and brittle outer shell of the earth, 70 to 125 more kilometers thick.
