EESA06H3 Chapter Notes - Chapter 4: Seismic Refraction, Continental Crust, Oceanic Crust
18 Apr 2016
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Maic: rocks high in magnesium and iron (ferric) Density of coninental crust and oceanic crust: coninental is less dense than oceanic crust. Mohorovicic disconinuity: (aka moho) the boundary separaing the crust from the mantle beneath it. Lower part of the oceanic lithosphere has been tectonically atached to the coninental crust at a convergent plate boundary. Geophysics: applicaion of physical laws and principles to a study of the earth. Includes study of seismic waves & earth"s magneic ield, gravity & heat. Seismic relecion: the return of some of the energy of seismic waves to the earth"s surface ater the waves bounce of a rock boundary (method of locaing rock boundary) If 2 layers of difering densiies are separated by a fairly sharp boundary seismic waves relect of that boundary. Seismogram record these relected waves shows the amount of ime the wave took to travel down the boundary, relect of it and return to the surface.
