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EESA06 Lecture 2.docx

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Environmental Science
Nick Eyles

EESA06 Lecture 2 Page 1EESA06 Lecture 2 The deepest mine in the world is 4km underground any deeper it will be too hot hole will begin to close due to temperature and movementGeophysicsapplication of physics to the worldEarthquakesgenerate energyFault planesurface between moving bocks which blocks have moved we feel as an earthquakeFocusis where the energy is released the trigger of the earthquake always underground can predict how much damage it can dohow deep down the focus is Epicenterdirectly above the focus on the earths surface Seismic risk assessmentgauge any movement along any fault looks at fault scarpfault trace Fault scarpcliff bluff the steep slope that results after earthquake ex1891 JapanFault tracefairly straight lines many river valleys along traces of faultso Morphologicalwhat shapes on earths surface created by faultsNot all faults create earthquakes some creep dont result in earthquake the lock ones create earthquakes WavesBody wavesgoes thru the interioro Primary and Secondary wavesSurface wavesgo around the surface Primary wavesthe quickest 7kmsec compressionextensionspringo can go thru fluids go all the way thru the interior of planet thru the
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