Field geophysics uses physical principles to learn about the structure of the Earth through measurements made by students. We will make several excursions to the vicinity of the Caribou Mine above Nederland for our field projects. Our goals are to learn the basics of the techniques, what kinds of targets they are good for, how to make field measurements and make simple reductions in the field to see if measurements are likely good, how to interpret the field measurements, and finally how to take advantage of the complementary nature of the different techniques. We will use seismic refraction, reflection, electrical resistivity, ground penetrating radar, gravity, and magnetics in the course.
Last meeting: Thursday, Oct. 27 in 265 FOR FINAL EXAM.
Redone lab due by 5 pm Nov. 1.
Note revised course schedule! (Revised again 9/26)
Schedule for the course online
Caribou topo map available through the Caribou page
Burger, Ch. 5 for the resistivity lab. Handout in class for GPR. Burger, Ch. 6 for gravity.
Textbook is Burger's Exploration Geophysics of the Shallow Subsurface. Milsom's Field Geophysics is a handy field reference. We will be using the software for the new version of Burger in this class.
Course Information Online
Field how-tos:
Lab info:
| station | terrain correction (mGal) |
|---|---|
| 235-05-01 | 6.08 |
| 235-05-02 | 4.88 |
| 235-05-03 | 4.80 |
| 235-05-04 | 4.71 |
| 235-05-05 | 4.93 |
| 235-05-06 | 6.32 |
| 801-05-01 | 5.02 |
| 801-05-02 | 5.19 |
| 801-05-03 | 5.23 |
| 801-05-04 |
Missing lines from station 235-05-04: last 2 measurements are 2851.017, 2851.018, time was 21:48:40.
Measurments 1 through 4 for meter 801 are locations 801-05-01 through 801-05-04.
Meeting Time: nominally 12:30 - 6 PM Tues (in 1B81), Thursday (in 265); we will set up a schedule early in the term but usually go out or have labs in the first half of the term. Labs/classes after the first week will generally start at 1 pm (to let some of us eat lunch), but field trips will begin at 12:30 pm.
Meeting Place:
TA: Gaspar Monsalve, BESC 458(?) D
The 2002 class page from Dr. Sheehan's class is still online
Older stuff of interest
The Caribou Park area was the site of an illegal offroad rally 9/23/00; I've put some photos from 1998 and 2000 together on a special Mudfest page for your amusement.
C. H. Jones | CIRES | Dept. of Geological Sciences | Univ. of Colorado at Boulder
Last modified at Tuesday, October 25, 2005 4:03 PM