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# Chapter 4 Reading Summary - Chapter 4 Earthquake Size and...

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Chapter 4: Earthquake Size and Location This is a short chapter focusing on mathematics and how to calculate the depth and location of earthquakes. If you look at the labs here it should be find, there’s nothing really new at all. Determining the epicenter, origin of time Geologists are able to locate where an Earthquake started by creative a time travel chart (travel time on the y-axis and distance on the x-axis). They drew on the graph where the P & S waves hit, and then measure the time different between when the P&S waves hit and then calculate the epicenter. - If you have the difference in velocity of 2 moving waves, and you know that they are steadily widening, you can find out there starting point The S-P time difference is enough to tell how far the earthquake was. Determining the focus or hypocenter - the interior material of the Earth is not homogenous so its hard to estimate the depth of an Earthquake - The accurate data for origin of time and travel time of waves is very important for finding a correct depth -

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