CroninProjects.org/ Vince/ Geodesy/ GPS-Ed.html |
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Plate Boundary Observatory Site P150 on Martis Peak, California. Data from this site are available via UNAVCO.. Photo by Vince Cronin.

The purpose of this page is to describe briefly how I present material related to the GPS strain module, and to provide what I think are the most current documents. The tentative syllabus for the Fall 2015 edition of my structural geology course is available at http://croninprojects.org/Vince/Course/IntroStructGeol/IntroStructSyl15.html.

Infinitesimal strain is described in the second chapter of Fossen's 2010 book *Structural Geology*, published by Cambridge University Press, which I use as the textbook in my course. Hence, relevant material is provided near the beginning of the course. The following documents will be used:

- Primer on infinitesimal strain analysis in 1, 2 and 3-D http://CroninProjects.org/Vince/Geodesy/GPS_Strain_Primer.doc

During the first lab period, I plan to work with ideas of 1-D strain, and have my students do the bungee cord experiment. We will also work on learning about vectors and some vector mathematics. The following documents will be used:

- Worksheet: 1-D Extension/Elongation of a Bungee Cord http://CroninProjects.org/Vince/Geodesy/ExtensionWorksheet.doc
- PowerPoint slide resources for 1-D extension/elongation of elastic cords. (Not a coherent presentation; intended just to give you some PPT slides to mine) http://CroninProjects.org/Vince/Geodesy/1D-ext-slides.ppt
- Vectors and vector arithmetic http://CroninProjects.org/Vince/Geodesy/VectorSummary30Aug2012.docx
- Vector worksheet http://CroninProjects.org/Vince/Geodesy/VectorWorksheet.docx

During the second lab period, my students will learn a bit of matrix math. The following docs will help here:

- Matrices http://CroninProjects.org/Vince/Geodesy/Matrices.doc
- Worksheet on vector dot products and simple matrix mathematics http://CroninProjects.org/Vince/Geodesy/DotProd&MatrixWorksheet.docx
- Orthogonal transformation of cartesian coordinates in 2D & 3D http://CroninProjects.org/Vince/Geodesy/OrthogonalCoordTrans.doc
- Coordinate transformation homework http://CroninProjects.org/Vince/Geodesy/CoordTransHW.doc

During the sixth lab period, we will explore some physical models of deformation, including the stretchy-cloth and powder models that use dots to represent GPS sites. See, for example, http://croninprojects.org/Vince/PhysModel/index.htm

The project starts in earnest during the seventh lab period. Students receive the following handout, in paper form and electronically, describing their assignment and linking to relevant documents: http://CroninProjects.org/Vince/Geodesy/GPS_ProjDescr_2014.docx.

- Introduction to GPS http://CroninProjects.org/Vince/Geodesy/GPS_Intro.ppt
- Introduction to the GPS triangle-strain problem http://CroninProjects.org/Vince/Geodesy/GPS_Triangle_Strain.ppt
- Cascadia example http://CroninProjects.org/Vince/Geodesy/CascadiaSlides.pptx
- How to find PBO GPS data http://CroninProjects.org/Vince/Geodesy/FindingGPSdata.doc
**This needs to be revised to reflect the current PBO network map, the current North American datum, and so on.** - Blank worksheet for an arbitrary triplet of GPS data http://CroninProjects.org/Vince/Geodesy/PBOWorksheet14.doc
- Cascadia velocity map http://CroninProjects.org/Vince/Geodesy/CascadiaVelocityMap.doc
- Tahoe map for depicting total site velocities ttp://CroninProjects.org/Vince/Geodesy/TahoeVelocityMap.doc
- GPS triangle strain calculator in Excel http://CroninProjects.org/Vince/Geodesy/GPS_Triangle_Strain.xls
- Explanation of strain calculator output data http://www.unavco.org/education/resources/educational-resources/lesson/majors-gps-strain/module-materials/explanation-of-calculator-output.pdf
- Algorithm for triangle strain http://CroninProjects.org/Vince/Geodesy/TriangleStrainAlgorithm.doc
**This needs to be revised to be consistent with the Excel spreadsheet as it currently exists, which uses latitude and longitude as input data.** - Description of GPS triangle strain project http://CroninProjects.org/Vince/Geodesy/GPS_ProjDescr_2014.docx
- Grading rubric for GPS strain project http://CroninProjects.org/Vince/Geodesy/Rubric13.doc
- Library of triangle-strain images http://CroninProjects.org/Vince/Geodesy/TriangleStrainPics.doc

A list of documents prepared/used in the ill-fated short course at the 2014 Structural Geology and Tectonics Forum at the Colorado School of Mines -- modified to reflect current file locations on my new server -- is available at http://CroninProjects.org/Vince/Geodesy/GPSstrainSGTFshortcourse.docx

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All of the original content of this website is © 2015 by Vincent S. Cronin