Q.13.19 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 in the form of a graph. Determine the depths of the strata. V, = 2250 m/sec D 8 x 5 x 10 C Surface soil V = 750 m/sec Sand and loose gravel H2 V, Rock AB; = 8.75 x 10' see AC, = 33.75 x 10' sec AC; = 38.75 x 10' sec !3! %3D d, = 2.188 m V = 172 m/sec d; = 22.5 m AB = 12,75 x 10 ' sec 10 20 d 30 Distance m 40 50 Time of first wave arrival, seconds

Structural Analysis
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Q.13.19
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
in the form of a graph. Determine the depths of the
strata.
V, = 2250 m/sec
D.
8 x 5 x 10
C,
Surface soil
V = 750 m/sec
Sand and loose gravel
H2
V,
Rock
AB; = 8.75 x 10' see
AC, = 33.75 x 10
AC; = 38.75 x 10' sec
%3!
sec
%3D
d; = 2.188 m
V = 172 m/sec
d; = 22.5 m
AB = 12,75 x 10 ' sec
o d,
20 d
10
30
Distance m
40
50
Time of first wave arrival, seconds
Transcribed Image Text:Q.13.19 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 in the form of a graph. Determine the depths of the strata. V, = 2250 m/sec D. 8 x 5 x 10 C, Surface soil V = 750 m/sec Sand and loose gravel H2 V, Rock AB; = 8.75 x 10' see AC, = 33.75 x 10 AC; = 38.75 x 10' sec %3! sec %3D d; = 2.188 m V = 172 m/sec d; = 22.5 m AB = 12,75 x 10 ' sec o d, 20 d 10 30 Distance m 40 50 Time of first wave arrival, seconds
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