Q.2.13 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/sec 8 x 5 x 10 C, Surface soil V = 750 m/sec Sand and loose gravel V, Rock AB, = 8.75 x 10' sec AC, 33.75 x 10 sec AC: = 38.75 x 10 sec d; = 2.188 m V = 172 m/sec d = 22.5 m AB = 12,75 x 10 sec 20 d; Distance m 10 30 40 50 Figure Time of tirst wave arrival, seconds

Structural Analysis
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Author:KASSIMALI, Aslam.
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Q.2.13
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/sec
8 x5 x 10
Surface soil
V = 750 m/sec
Sand and loose gravel
H
V,
Rock
AB, = 8.75 x 10'see
AC, 33.75 x 1o sec
AC: = 38.75 x 10 sec
d; = 2.188 m
d = 22.5 m
AB = 12,75 x 10 sec
V = 172 m/sec
0 d
10
20 d;
30
50
40
Distance m
Figure
Time of tirst wave arrival, seconds
Transcribed Image Text:Q.2.13 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/sec 8 x5 x 10 Surface soil V = 750 m/sec Sand and loose gravel H V, Rock AB, = 8.75 x 10'see AC, 33.75 x 1o sec AC: = 38.75 x 10 sec d; = 2.188 m d = 22.5 m AB = 12,75 x 10 sec V = 172 m/sec 0 d 10 20 d; 30 50 40 Distance m Figure Time of tirst wave arrival, seconds
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