Geophysical Research - Geophysical Theory and Software
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The U.S. Geological Survey and its Mineral Resources Program require up-to-date methods for processing and interpretation of geophysical data in support of geologic and hydrologic investigations.
The objectives of this subtask are the development of new geophysical methods and the improvement of existing geophysical methods. Method development occurs through formulation of new theory and extension of existing theory. The theories are implemented and tested by the development of new software that is applied to the processing and interpretation of geophysical data. Focus areas include:
- Research into potential-field inversion and will produce software products for potential-field interpretation and processing.
- Work on adapting statistical methods for geochemical investigations. Adapt established statistical methods to account for the special problems in geochemical data. For example, one important problem is that geochemical data are compositional, meaning that they are percentages (or equivalents).
- Work on statistical inferences of geology from geophysical measurements. Most geophysical measurements are sparse, meaning that they don't completely cover the geographical region of interest. Hence, these measurements cannot directly to infer the geology throughout the region of interest. However, this inference can be done indirectly using spatial statistics. Plans are to conduct research on this issue using a data set that involves electrical resistivity measurements at a site with contaminated groundwater.
- Algorithm development for implementing Bayesian Markov Chain Monte Carlo methods to geophysical parameter estimation and model appraisal.
- Manuscript development on various aspects of research on the origins of aeromagnetic anomalies over faulted layers for the Leading Edge.
- Collaboration with other government agencies, universities, and the private sector to develop software, analyze and document equipment performance, and improve data processing and display. This will mostly involve continued development of the rewrite of GPR viewing and processing program (started in cooperation with USACE and University of Denver), adding optimal resistivity arrays to his program that creates command files for our SuperSting R8, updating field guides, and cooperating in a joint venture with Golden Software to develop an independent 2-D and 3-D model builder.
- Preparation of a 6 hour course titled "Inversion of Airborne Electromagnetic Data - Practical Aspects" to be given at Forth Brazilian Symposium of Geophysics in November 2010.
- Development of electromagnetic (EM) survey methods using improved calibration methods particularly in Agricultural applications. Case histories for a special journal publication will be co-edited and an overview introduction written.
Box 25046 MS 964 Denver Federal Center
Denver, CO 80225-0046
Email: Jeffrey Phillips
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