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This page first made public: Dec 9, 2016
Strengths of the Module
Most structural geology courses only cover finite strain (generally through the analysis of deformed fossils), missing the rich opportunity to investigate ongoing strain (infinitesimal strain) now measurable through methods such as GPS. This module introduces geoscience majors to Plate Boundary Observatory (PBO) GPS data in order to study infinitesimal strain and connect it to broader tectonic settings and hazards.
The earlier units help ground the students in the societal impact of earthquakes and give them an opportunity to explore strain and deformation through a variety of physical models ranging from Silly Putty® to drywall compound. This affective and intuitive introduction to strain provides a firm foundation from which to learn about strain quantitatively.
Students work with GPS velocity data in sets of three stations in the same region that form an acute triangle. By investigating how the ellipse inscribed within this triangle deforms, students learn about strain, strain ellipses, GPS data, and how to connect these to regional geology and hazards. The calculations can be done using provided Excel or Matlab calculators (most typical) or students can be asked to do the calculations or coding themselves.The Unit 6 summative assessment has the students select a set of three GPS stations in an area of interest to themselves. For many students this is their first experience with "research" and possibly their first time giving an oral presentation. Despite initially being daunted by this idea, students generally end up doing well on it and gaining notable confidence with GPS data.
Great fit for majors-level classes in:
- structural geology
- applied physics
- applied engineering
Table of Contents
- Instructor Materials: Overview of the GPS, Strain, and Earthquakes Module
- Unit 1: Earthquake!
- Unit 2: Mashing it up: physical models of deformation and strain
- Unit 3: Getting started with GPS data
- Unit 4: GPS and infinitesimal strain analysis
- Unit 5: 2014 South Napa Earthquake and GPS strain
- Unit 6: Applying GPS strain and earthquake hazard analyses to different regions
- Student Materials
- Instructor Stories
- Join the Community