A seismic survey was carried out for a large project to determine the nature of the substrata. The results of the survey are given in Fig. i 2 in the form of a graph. Determine the depths of the strata. V, = 2250 m/scc D. 8 x5 x 10 Surface soil V = 750 m/sec Sand and loose gravel V, Rock AB, = 8.75 x 10' sec AC, = 33.75 x 10 AC = 38.75 x 10' sec d = 2.188 m sec V = 172 m/sec d; = 22.5 m AB = 12,75 x 10 sec d 10 20 d 30 Distance m 50 40 Figure Time of first wave arrival, seconds

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