Download Teaching Near Surface Geophysics in the Field

Teaching Near-Surface Geophysics in
the Field
Sarah Kruse
University of South Florida
*see notes on Powerpoint file for details
Learning Goals
for USF B.S. and M.S. students
and workshops in Latin
America
Hands-on experience
Using physical intuition
basic underlying physics
Forward modeling and
processing toolbox
Science communication
writing reports
discussing posters
Geophysics field opportunities at USF
1. Principles of Applied Geophysics
Field project
Principles of Applied Geophysics
Logistics
Principles of Applied Geophysics
Logistics
Principles of Applied Geophysics
Logistics
Principles of Applied Geophysics
Logistics
Principles of Applied Geophysics
Logistics
Principles of Applied Geophysics
Assessment
toolbox
Principles of Applied Geophysics
Data archive
Geophysics field opportunities at USF
2. Geophysics Field Camp
Learning Goals
Hands-on experience
Using physical intuition
basic underlying physics
Forward modeling and
processing toolbox
Science communication
 writing reports,
combined analysis of
multiple methods on site
Geophysics Field Camp
Logistics
Geophysics Field Camp
Logistics
$
Geophysics Field Camp
Logistics
Geophysics Field Camp
Logistics
Geophysics Field Camp
Logistics
Geophysics Field Camp
Assessment
Section heading
Introduction
Methods
Results
Discussion
Strengths and
Limitations (of this
method)
Sample content
Why this site?
Purpose of resistivity/conductivity measurements:
Expect to see freshwater/saltwater interface (describe expected conductivity contrast)
May see tar mats, buried tar mats (describe expected conductivity contrast)
Ground truthing
Equipment: AGI Supersting R8 resistivity meter
Field geometries: 28 electrodes, 1-m spacing
Acquisition parameters: dipole-dipole and inverse Schlumberger array geometries, 2 cycles/reading
Processing software: Res2dinv
Processing steps: Editing data (what % removed, why?), inversion parameters, number of iterations,…
Map, position information
Describe data volume, data quality
Raw data (if appropriate) = pseudosection
Processed data = inversion Xsection(s)
On processed data image (preferably second copy), add notations with geologic interpretations
Comparisons with ground truthing
Comparisons with other methods (if available)
If appropriate, what didn’t work and why
Finer spatial resolution than EM-31 or EM-34 (be quantitative if possible)
Labor-intensive (xx hrs for xx meters of profile)
Geophysics Field Camp
Assessment
Geophysics Field Camp
Geophysics field opportunities at USF
3. Field Geophysics
Field Geophysics
Logistics
Field Geophysics
Assessment
Section heading
Introduction
Methods
Results
Discussion
Strengths and
Limitations (of this
method)
Sample content
Why this site?
Purpose of resistivity/conductivity measurements:
Expect to see freshwater/saltwater interface (describe expected conductivity contrast)
May see tar mats, buried tar mats (describe expected conductivity contrast)
Ground truthing
Equipment: AGI Supersting R8 resistivity meter
Field geometries: 28 electrodes, 1-m spacing
Acquisition parameters: dipole-dipole and inverse Schlumberger array geometries, 2 cycles/reading
Processing software: Res2dinv
Processing steps: Editing data (what % removed, why?), inversion parameters, number of iterations,…
Map, position information
Describe data volume, data quality
Raw data (if appropriate) = pseudosection
Processed data = inversion Xsection(s)
On processed data image (preferably second copy), add notations with geologic interpretations
Comparisons with ground truthing
Comparisons with other methods (if available)
If appropriate, what didn’t work and why
Finer spatial resolution than EM-31 or EM-34 (be quantitative if possible)
Labor-intensive (xx hrs for xx meters of profile)
Field Geophysics Workshops
Latin America
Field Geophysics Workshops
 Case studies for subsequent students with access
to site but not to equipment
 Critical to find sites with some ground-truthing
Field Geophysics Workshops
Field Geophysics Workshops