Applied Geophysics

Name:

1. Find the velocities (in meters per second) of the three layers shown in the graph.

(The answer choices are listed as V1, V2, and V3).

2. The crossover point xco1 is at 230 meters. What is h1?

3. Find the intercept time for line 3 (green line) on the graph by laying a ruler

along the line and seeing where it intercepts the Y-axis. Now you have enough

information, find the thickness of layer 2 (h2).

4. Now we can calculate θic. Critical refraction is 90° because the interface is

horizontal. Use Snell’s Law to determine critical incident angle.

5. Last but not least, we can calculate θi. Use Snell’s law.