GPH 492/692
Applied Geophysics

offered each Spring semester
Prerequisite/Corequisite: GPH 333
4 Credits, call #87532/#82845; Mondays, Wednesdays, and Fridays 11:00-11:50 in LMR 353
Lab session is certain Wednesdays 5:00-7:00 PM in LMR 351

Instructor: John Louie, 217 LME, 784-4219, louie@seismo.unr.edu


Learning Objectives: This course is a capstone survey of geophysical techniques applied to solving geoscience and engineering problems in resource exploration and development, natural hazards, and pollution control. The course is intended to be a practical, hands-on, field-oriented course on the applications of geophysics to these problems. For each topic, the development will proceed from basic principles (theory) through methodology and applications, to case histories. Applications will be emphasized; theory will be kept to essentials. The basic principles and operational procedures of each method will be presented, along with discussions of where the method is and is not applicable. Case histories will be included to illustrate applications.

Assigned readings and composition of literature reviews will be an integral part of the course work. As a major capstone course for undergraduates, your work in this course will integrate all of the computational, critical thinking, writing, and geophysical skills you have gained during your Geology or Geophysics degree program.

The course has 4 elements: lectures, lab exercises, reading case-history literature, and a field project.
The description below is available to WWW browsers at the URL http://www.seismo.unr.edu/ftp/pub/louie/class/492-syll.html.

Lectures

In general three 50-minute lectures will be given each week, focusing on processes, concepts, and methods reported in the literature. In advance of each lecture, please download the scanned overheads from this folder for the seismic lectures during the first part of the class, and download PDFs of powerpoint presentations from a hidden web site for the gravity, magnetics, GPS, and electromagnetics lectures later in the semester. The instructor will give you the location of the hidden web site in class. The required text is W. Telford, L. Geldart, and R. Sheriff, Applied Geophysics, Cambridge Univ. Press, ISBN 0521339383 (Google Books link -$74.57 from Amazon.com, but only a few in stock; also availble new from Barnes and Noble and used from both for much less). The schedule of readings from the text are noted in the syllabus below.

Lab Exercises

About seven laboratory exercises or problem sets will be assigned, to test students' grasp of key concepts and methods. All of these exercises will be computer-based, with software provided by the instructor for download from this web page. One exercise requires use of one of Mackay LMR 351 lab PCs, to access licensed commercial software. All other exercises will be Windows-compatible, and most will be Mac and Linux compatible as well. Links are given from the assignments in the syllabus below. The instructor will be available during most of the Wednesday 5-7 PM lab periods to help students complete the assignments. Most of these lab periods will be held in LMR 351.

However, students are responsible for finding the computer resources needed to complete the exercises on their own time. Please inform the instructor immediately if you cannot locate a suitable computer, or if you feel additional class lab sessions need to be scheduled for an exercise. In general each lab exercise will be due one week after the lecture covering the included concepts. Students may work together to complete the exercises, but all must turn in only their own work. Late exercises will be accepted with a 10% penalty for a week or two after the due date, possibly later at the instructor's discretion.

Reading Case-History Literature

Students will write about six abstracts of scientific articles on case histories. Lists of published case histories to select from are linked in the syllabus below. Everyone should turn in an original abstract of any one or more of the assigned readings. More than one student may write an abstract on the same reference, but students must write their abstracts on their own. The abstract should be between 100 words and 1 page long. It will be evaluated for neatness, English usage, and how well it ``concentrates the essential information'' of the chosen reference(s). Please refer to the handout on Pointers for writing good abstracts.

Field Project

The class will conduct a small-scale geophysical field investigation in the Reno area during the March 13-21 Spring Break, and work in concert with a visiting collaborator from Boise State Univ. The work is part of a project funded by the U.S. Geological Survey, to characterize the Reno basin and improve the realism of the Western Basin and Range Community Velocity Model, by imaging faults in the Reno urban area (click on the links for additional info). Seismic, gravity, magnetic, and electrical methods will be employed, and interpreted.

Planning and mobilizing for each geophysical method will be assigned to a student group from the class. Everyone in the class must be willing to give up their entire spring break for the field project. The fieldwork may occupy all nine days of Spring Break, from 8 AM to 6 PM each field day. Additional details will be announced in February. There is a field project preparation web page from 2008 that will be updated with this class's objectives.

Each method's group will present their analysis with a 15-minute seminar during the class Final Period on Monday May 10, 9:45-11:45 AM in LMR353. While the class will collectively analyze the data obtained, students will be responsible for their own written reports. Each should describe the objectives, previous work, methods, results, and implications of the entire project in 5 to 10 pages of text, plus figures. For further guidance, see the page on elements of a professional report. The class may be able to publish its collected results. There will be no final exam, unless the field project becomes a complete failure.

Grades will be calculated as follows:
Lab Exercises40%Abstracts30%
Oral Presentation10%Field Report20%
Final grades will be curved separately for graduate and undergraduate students, and plus or minus grades may be assigned. Most years, the letter grade is determined from a scale such as this:
Letter Grade% of 100% possibleLetter Grade% of 100% possibleLetter Grade% of 100% possible
A90-100B-77-79D+63-66
A-87-89C+73-76D60-62
B+83-86C70-72D-57-59
B80-82C-67-69F0-56
Academic Dishonesty
is defined as cheating, plagiarism or otherwise obtaining grades under false pretenses. I will return any work that contains plagiarism to you without grading it. If I do this, please meet with me ASAP so I can instruct you on how to avoid academic dishonesty, and encourage you to revise and re-submit the assignment for class credit. You are encouraged to work with your classmates on all assignments except your abstracts. However, you must turn in your own work for it to count toward your grade, free of any academic dishonesty.

Accommodating Disabilities

I encourage any student needing to request accommodations for a specific disability to please meet with me at you earliest convenience to ensure timely and appropriate accommodations.

Syllabus and Schedule

Download scans of overheads from this folder.
Not all lecture days are listed- two topics are listed per week, divided among three lectures. Lecture links contain supplemental materials.
1/20Seismic principles - moduli, wave propagation, Snell, reflection, surface waves
Text: p. 136-143, 147-162
- First-arrival picking and velocity inversion lab Tutorial I 5:00-7:00 PM LMR351
1/22Seismic principles - porosity, Q, sources, geophones and digital recorders
Text: p. 192-207 A wave-modeling facility, with links to movies
1/25Refraction - acquisition, sources, t-x plots, depth, dip, reversal
Text: p. 162-176, 209-216
1/27Refraction - low-vel & thin hidden layers, v-z ambiguity, surface wave applications (media files)
Text: p. 235-243
- First-arrival picking and velocity inversion lab Tutorial II 5:00-7:00 PM LMR351
2/1Reflection principles - profiling, sounding, NMO, dip
Text: p. 176-186
2/3Reflection principles - Vrms, Dix, vert resolution, horiz resolution
Text: p. 207-209
- Abstract DUE on engineering seismic case history
- Surface-wave dispersion analysis and modeling lab Tutorial I 5:00-7:00 PM LMR351
2/8Reflection acquisition - spreads, s/n, stack chart, phases, spatial aliasing
Text: p. 186-192
2/10Field project objectives - geologic setting, previous geophysics, planning
- First-arrival picking and velocity inversion lab DUE
- Surface-wave dispersion analysis and modeling lab Tutorial II 5:00-7:00 PM LMR351
2/15NO CLASS - Presidents Day Holiday
2/17NO CLASS - Instructor at workshop
2/19Reflection analysis - displays, spectra, BP filtering, gather slicing
Text: p. 216-228
- Surface-wave dispersion analysis and modeling lab DUE
Reflection analysis - CMP stacking, CV stack picking, diffractions, migration
Text: p. 229-233, 243-248
2/22 J. N. Louie, W. Honjas, and S. Pullammanappallil, Geophysical exploration for geothermal resources: Advanced seismic technology: Geophysical Techniques in Geothermal Exploration Workshop, 2007 Geothermal Resources Council Annual Meeting, Reno, 28 September.
Text: p. 233-235, 248-272
2/24Gravity principles - densities, corrections, instruments, acquisition
Text: p. 6-7, 10-26
- Abstract DUE on seismic reflection case history
- Reflection Processing Lab Tutorial I 5:00-7:00 PM LMR351
3/1Gravity interpretation - modeling, trends, contouring, spatial filters
Text: p. 26-48
3/3Magnetics principles - properties, susceptibility units, diurnal drift, storms, instruments, acquisition
Text: p. 62-63, 67-84
- Abstract DUE on potential fields case history
- Reflection Processing Lab Tutorial II 5:00-7:00 PM LMR351
3/8Magnetics interpretation - modeling, trends, contouring, poles, filters
Text: p. 84-114
3/10Catch up, field preparation
- Reflection Processing Lab DUE
3/13-3/21Spring Break Field Project - Previous Fieldwork Photo Albums: 2009; 2007; 2005; 2003; 2002; 2000
3/22Field interpretation - elements of professional report, integration
3/24Gravity/magnetics case studies - basin and bedrock geometry
Text: p. 48-52, 114-134
- Gravity Lab Tutorial 5:00-7:00 PM LMR351
3/29GPS and Geodesy principles (1 Mb PDF)
3/31GPS acquisition and analysis, radar interferometry
- Gravity Lab DUE - Talwani inversion
- Magnetics Lab Tutorial 5:00-7:00 PM LMR351
4/5GPS applications and case histories
4/7Electrical/hydraulic properties - rocks, fluids
- Magnetics Lab DUE
4/9- draft methods paragraphs, result plots, reduced data DUE to class from each field team
4/12DC Resistivity - acquisition, apparent resistivity, modeling, curve fitting
4/14Frequency-domain electromagnetics - wavelengths, phase, skin depth
- Abstract DUE on geodetic/inSAR case history
- Resistivity modeling lab Tutorial 5:00-7:00 PM LMR351
4/19Time-domain electromagnetics - dynamos, eddy currents, acquisition, modeling
4/20-23Guest lectures or no class- instructor out of town
4/23- draft results paragraphs, improved result plots DUE to class from each field team
4/26Induced polarization, self potential - theory, acquisition, interpretation
4/28Resistivity modeling lab DUE - uses RESIX demo software on DOS
5/3Electromagnetic case studies - deep-crustal fluids, waste plume characterization
- Abstract DUE on electromagnetic case history
if time permitsThe borehole environment - drilling, casing, fluids, filtrates & cakes
if time permitsBorehole methods - SP, induction, laterologs, acoustic, gamma, neutron
Monday 5/10Group Project Results Presentations during final period LMR 353 9:45-11:45 AM
- Abstract DUE on borehole case history (if assigned)
Weds. 5/12Individual Project Reports Due 5:00 PM LME 217


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