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Grade 12Wave Motion

An earthquake generates both transverse (s) and longitudinal(p) waves in earth.the speed of s waves is about 4.5km per second and that of p waves id about 8km per second.A semisograph records P and S waves from an earthquake.The first P wave arrive 4mjn before the first S wave.The epicentre of earthquake is located at a distance of about.....

Profile image of Aniket
8 Years agoGrade 12
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1 Answer

Profile image of Arun
8 Years ago
Dear Aniket
Let the epicenter of the earthquake be at a distance of x from the origin (focus) of the earthquake.
Therefore, difference between the time taken by the P waves and S waves to reach the focus are 4 minutes = 240 seconds.
Therefore, (x/4.5) – (x/8) = 240
Therefore, x = 2470 km = 2500 km
Regards
Arun (askIITians forum expert)

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