GEOPHYSICS (GEOL 4433)
EXAM 1- FALL 1998
YOUR BIG SEISMIC REFRACTION ADVENTURE
ANSWER
The table below present the relevant data for constructing the crustal structure of the Pacific Ocean Basin. The model I used to make the time-distance table for the exam has only 4 layers with the p-wave velocities and critical angles of incidence given below. Almost all of you identified 6 layers in the problem. Can you think of a reason for this discrepancy?
VELOCITY (m s-1) |
INCIDENT ANGLE |
THICKNESS (m) |
|||
| Vp1 | 2800 | i01 | na | h1 | 950 |
| Vp2 | 4800 | i12 | 35.69 | h2 | 1125 |
| Vp3 | 6900 | i23 | 44.08 | h3 | 5000 |
| Vp4 | 7550 | i34 | 66.05 | h4 | na |
