GATE-2016
28.
The following figure shows a seismic reflection experiment above a
reflector that dips 45 , the p-wave velocity in the medium is
constant and equal to 2km/s. the source is kept at location 'S' and
receiver is kept at location 'G'. the midpoint between S and G is
denoted by M and the depth to the reflector from M is 1km. The travel
time of the primary reflected arrival recorded at the receiver is
equal to........ seconds
Solution:
Reflection
at an inclined interface
Travel
time of the dipping reflector (tm) =(2*d*cosϴ) / V
-----(1)
d-
depth to the interface =1000m
V-
velocity of the layer = 2000m/s
ϴ
-dipping angle = 45˚
These
values substitute in eq(1)
tm= (2*
1000*cos45˚) / 2000
tm= cos45˚
tm= 0.707s
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