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Why do you need to draw a circle around each seismograph center, using the distance to the epicenter as the radius?
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Why do you need to draw a circle around each seismograph center, using the distance to the epicenter as the radius?

User Emerito
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The reason you must draw circles around each seismograph is to locate the exact point of the earthquakes origin. You use the point where the circles overlap to locate the epicenter of the earthquake. 
User Vignesh KM
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