Gate_2020
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A Seismic Reflection Survey is carried out over a 1500 m thick horizontal layer with a P- wave velocity of 2000 m/sec. the travel time of the reflected wave at a surface detector placed 1000 m from a surface source is ________milli seconds.
Sol:
Given that
velocity (V) = 2000 m/sec
Thickness of layer (Z)
= 1500 m
Distance between source and
Receiver (X) = 1000 m
Travel time of the reflected
wave (T) = ?
The travel time of a
reflected wave for a horizontal layer
$T =
\sqrt{\frac{X^{2}+4Z^{2}}{V^{2}}}$
$T =
\sqrt{\frac{(1000)^{2}+4(1500)^{2}}{(2000)^{2}}}$
$T =
\sqrt{\frac{10^{6}+9\times10^{6}}{4\times10^{6}}}$
$T =
\sqrt{\frac{10\times10^{6}}{4\times10^{6}}}$
$T = \sqrt{2.5}$
T= 1.5811 seconds
T = 1581.1 milli seconds
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