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distance from the seismograph to the location of earthquake

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When an earthquake occurs, two types of sound waves are generated and travel through the earth. The primary, or P wave has a speed of about 8 km/s and the secondary wave, or S wave has a speed of about 4.5 km/s. A seismograph, located some distance away, records the arrival of the P wave, then 78 s later, records the arrival of the S wave. Assuming that waves travel in a straight line, how far is the seismograph away from the earthquake?

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When an earthquake occurs, two types of sound waves are generated and travel through the earth. The primary, or P wave has a ...

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