EESA06H3 Lecture Notes - Lecture 3: Seismic Tomography, Fault Scarp, Geothermal Gradient
9 Mar 2018
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Document Summary
Earth quakes produces seismic energy that helps us map the earth"s interior. Energy in the form of wave p and s waves. Primary waves are higher velocity and are felt first. Secondary are felt second - focus is where an earthquake is trigger (could be 700 km deep) Epicentre is the place on the earth surface above of the focus. Seismograph is a machine to measure displacements of the earth"s crust during an earthquake. Seismogram is the record - shadow zones do not have p and s waves. Geothermal gradient, release of heat from the underneath the planet to the surface. Heat flow and gravity method for mapping deep structure. 1891 fault scarp from the nobi earthquake in japan. Japan is part of the pacific rim (intersection of four plates) North american, eurasian, pacific and philippine plates (all at tokyo) Nobi earthquake- destroyed a considerable amount of western build infrastructure.
