EESA06H3 Lecture Notes - Supercontinent Cycle, Epicenter, Lithosphere
18 Apr 2012
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Document Summary
400-500 million years for one wilson cycle to happen. Pangaea 2 will occur in 250 million years. Part 1: what do earthquakes tell us about the plant"s interior and plate tectonics. Seismic energy is used to map the earths interior. Drilling 12 km is a physical limit to drilling because its starting to get pretty hot down there. Rocks are brittle, they snap, once it snaps the energy produce is the earthquake. The focus is the focus point under the surface of the earth, the epicentre is where the earthquake occurs. The line of breakage is called the fault plane, seismic waves are then produced. There are many blind faults in the us, that can potentially produce earthquakes, but we can see. Surface waves: they go around the surface of the planate, its usually these waves that do the damage. Secondary waves, which is the last type of energy wave to arrive, that go 2-4 km/s.
