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The velocity of the transverse waves produced by an earthquake is 8.9km/s, while that of the longitudinal waves is 5.1km/s. A seismograph records the arrival of the transverse waves 73s before that of the longitudinal waves. How far away was the earthquake?



Answer :

AL2006
The difference in the speeds of the two types of waves
is (8.9 - 5.1) = 3.8 km/sec.

In 73 sec, the faster one pulls ahead of the slower one
by  (73 x 3.8) = 277.4 km.

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