Answer:
Let be
the velocities of S waves and P waves, and be the time
taken by these waves to travel to the position of seismograph. If / is the
distance of occurrence of earthquake from the seismograph, then
??.(i)
Now, and ?.(ii)
or
Also, min = 240 s
Using (ii),
Now, from (i)
Hence
earthquake occurs 1920 km away from the seismograph.
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