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

What is seismic refraction surveying also used for?

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