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Seismic Refraction Surveying

A refracted wave
Measures the velocity by considering the increase of reflected travel time with offset distance
Are waves that are reflected in the subsurface back to the surface
Is the degree which the material opposes the flow of electricity
Is one that changes direction as it enters a new medium
As the waves travel deeper
Waves tend to decrease in velocity
Waves tend to increase in velocity
The waves' velocity is constant
The waves' velocity is random
We could get erroneous data if
The bottom layer has a higher velocity than the top layer
The top layer is has a higher velocity than the deeper layer
The two layers are too close together
The beds are dipping
In a blind layer
Head waves are produced but they are not first-arrival waves
The layer is offset vertically
The layer is dipping
The waves have lower velocity in the deeper layer than the top layer
 
What is the accuracy of an on land profile?
0.5ms
0.1ms
10ms
0.05ms
Can you remember the weathering correction equation?
Of course!
Nope
Huh?
I think so
To display all the information together, we use
A stacking time scale
A reduced time scale
A common point time scale
A refraction time scale
A corrected time scale
What is seismic refraction surveying also used for?
Engineering and environmental surveys
Hydrological surveys
Crustal seismology
Two-ship seismic surveying
Stacking
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