Plate Boundary Observatory Site P150 on Martis Peak, California. Data from this site are available via UNAVCO. Photo by Vince Cronin.
GPS, Strain, and Earthquakes
NOTE that the most current module materials can be downloaded via the link provided above. Some of the files linked below were derived from this resource set on or about 5 July 2018.
UNAVCO is "a non-profit university-governed consortium [that] facilitates geoscience research and education using geodesy." The public resources of UNAVCO are available via http://www.unavco.org, including data, software, and the many products of its education and outreach efforts. More information about UNAVCO is available at http://www.unavco.org/about/about.html.
Introduction and motivation: http://croninprojects.org/GETSI-EER2018/1.Motivation-Intro-v1-lowres.pdf (lowres pdf, 27.6 MB) [highres pdf, 175.4 MB] [JPEG images, 27.8 MB total] [Keynote original 158.4 MB]
Overview of module: http://croninprojects.org/GETSI-EER2018/2.0.Overview-GPS-strain-module-lowres.pdf (lowres pdf, 6.9 MB) [highres pdf, 10.1 MB] [JPEG images, 7 MB total] [Keynote original 9.7 MB]
GPS/GNSS Basics: http://croninprojects.org/GETSI-EER2018/3.introduction_gps_presentation.v11.pdf (pdf, 34.4 MB) [PowerPoint original 32.2 MB]
GPS strain analysis (lowres pdf, 13.7 MB) [highres pdf, 33.7 MB] [JPEG images, 21 MB total] [Keynote original 40.9 MB]
Cascadia strain example: http://croninprojects.org/GETSI-EER2018/5.oregon_cascadia_post-exercise_.v3.pdf (pdf, 1.8 MB) [PowerPoint original 1.9 MB]
Graphic summary of the triangle-strain analysis: http://croninprojects.org/GETSI-EER2018/6.gps_infinitesimal_strain_analy.v2.pdf (pdf, 3.1 MB) [PowerPoint original 3.1 MB]
A relevant physical model
Your turn to do an analysis: http://croninprojects.org/GETSI-EER2018/9.Your-Turn-lowres.pdf (lowres pdf, 2.4 MB) [highres pdf, 5.3 MB] [JPEG images, 3.1 MB total] [Keynote original 5.9 MB]
How to find PBO GPS data: https://d32ogoqmya1dw8.cloudfront.net/files/getsi/teaching_materials/gps_strain/finding_gps_data_oregon.v6.docx
Input data sources
GPS data for site P088: https://www.unavco.org/instrumentation/networks/status/pbo/overview/P088
GPS data for site P116: https://www.unavco.org/instrumentation/networks/status/pbo/overview/P116
GPS data for site COON: https://www.unavco.org/instrumentation/networks/status/pbo/overview/COON
Excel calculator: https://d32ogoqmya1dw8.cloudfront.net/files/getsi/teaching_materials/gps_strain/gps_strain_calculator_excel.v3.xls
MatLab calculator: https://d32ogoqmya1dw8.cloudfront.net/files/getsi/teaching_materials/gps_strain/gps_strain_calculator_matlab.zip
Mathematica calculator: http://croninprojects.org/Vince/Geodesy/Calculators/gps-strain-calculator-mathematica.nb
How to interpret the strain calculator output: https://d32ogoqmya1dw8.cloudfront.net/files/getsi/teaching_materials/gps_strain/explanation_gps_strain_calculator.v3.pdf
USGS Quaternary Fault and Fold Database of the United States: https://earthquake.usgs.gov/hazards/qfaults/
This GETSI module would not exist without the efforts of many people at UNAVCO and elsewhere. The UNAVCO Community provided the collaborative environment in which we could create resources to facilitate student learning about an important topic that was not represented in the undergraduate geoscience curriculum. The book Structural Geology Algorithms by Rick Allmendinger, Nestor Cardozo and Don Fisher (2012, Cambridge University Press) provided a clear explanation of relevant topics -- it served as an initial ramp at the base of the learning curve. Bill Hammond and Corné Kreemer of the University of Nevada-Reno have been unfailingly generous with their time, serving as our geodetic experts. Phil Resor (Wesleyan University) and I have broadly similar backgrounds as structural geologists, but Phil has brought a different level of intelligence, energy and creativity to the project. He is the author of the MatLab resources and (with input from Hammond) the lead author of the Napa Earthquake unit. Shelly Olds (UNAVCO) encouraged the initial development of these resources, and Beth Pratt-Sitaula (also UNAVCO) has been the driving force behind the reformulation of the first-gen resources into a coherent GETSI module. Donna Charlevoix and Meghan Miller have provided generous institutional support from UNAVCO. Nancy West helped us to keep the cognitive level of the resources developed for this module within the range of average undergraduate geoscience students.
— Vince Cronin
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