EESA06H3 Lecture 2: Lecture 2 In class notes

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As you go down in depth it gets hotter 2. 5 degrees centigrade for every 100m. What we know about the earth"s surface is the result of geophysics, the application of physical principals to the earth. Focus is where the energy is released. Epicenter is the point on the earth"s surface directly above the focus. Bluff is the steep slope that occurs where we"ve moved one block against another. Seismic risk assessment is trying to identify what the danger is to communities as a result of earthquakes. Seismic waves are very abrupt movements along the faults. Not all faults produce earthquakes, but some creep and release energy all the time, whereas there are others that lock and build energy and release. Primary waves move energy through alternating compression producing waves at speeds of 7km/s, can also go through fluids and are able to go completely through the core of the earth. Secondary waves are slower (5km/s) and are like waves.

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