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Canada (158,383)
EESA06H3 (234)
Nick Eyles (205)
Chapter 3

Chapter 3 Notes

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University of Toronto Scarborough
Environmental Science
Nick Eyles

Chapter 3 EARTHQUAKES What Causes Earthquakes? -seismic waves: cause the earth to shake -the earth puts stress on the rock, and it bends (strain) -elastic rebound theory: the sudden release of stored elastic strain energy in rocks, causing movement along a fault -tectonic forces act on a mass of rock over many decades -maximum depth of focus is 670km -shallow focus: 0-70km -intermediate focus: 70-350 km deep -deep focus: 350- 670 km Measuring the Size of an Earthquake -damage to buildings depends greatly on the type of geological material it was built on and the type of construction -stone houses suffer more than wooden ones -can also calculate the amount of energy released; done by measuring the squiggles on a seismogram -Richter scale is open ended which means there is no earthquake too big or too small -8.6 is the biggest recorded so far -can also measure the seismic movement; determined from the strength of the rock, surface area of the rupture, and amount of rock displacement along the fault -Richter scale is logarithmic, so the difference between 2 consecutive numbers on the scale means an increase of 10 times the amplitude www.notesolution.com
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