EESA06H3 Final: EESA06 Final Exam Ch3 Summary + 40 MCQ/T or F

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Earthquakes usually occur when rocks break and move along a fault to release strain that has gradually built up in the rock. Deep quakes may be caused by mineral transformations. Seismic waves move out from the earthquake"s focus. Body waves (p waves and s waves) move through earth"s interior, and surface waves (love and rayleigh waves) move on earth"s surface. Seismographs record seismic waves on seismograms, which can be used to determine an earthquake"s strength, location, and depth of focus. Most earthquakes are shallow focus quakes, but some occur as deep as 670 kilometres below earth"s surface. The time interval between first arrivals of p and s waves is used to determine the distance between the seismograph and the epicentre. Three or more stations are needed to determine the location of earthquakes. Earthquake intensity is determined by assessing damage and is measured on the modified.

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