Geology and Environmental Geosciences
College of Charleston
How Slab Dip Affects the Location of Volcanoes part of MARGINS Data in the Classroom:MARGINS Mini-Lessons
In this module students will be provided with data regarding the depth of subduction zone earthquakes (from the approximate top of the slab) and surface volcano locations for Central America, they will then plot this data on a map and develop a hypothesis regarding their relationship. As part of this exercise students will create a cross-section of some of the earthquakes, and determine the dip of the slab. The students will then be asked to look at a map of subduction zone earthquake depths for another location and predict where they would expect the volcanoes to be located. They will compare their results with the location of the actual volcanoes in the region. The students will then create a cross-section of the new subduction zone (Tonga) and determine the slab dip for that location. Finally, students will develop a hypothesis regarding slab dip and the distance volcanoes are from the trench (marked on both the Central America and Tonga maps) and test that hypothesis on the Cascadia subduction zone.
Food Rheology; Folding Fun part of Cutting Edge:Structural Geology:Structure, Geophysics, and Tectonics 2012:Activities
In this activity students analyze the rheologic and structural properties of various foods (everything from pudding to white bread) and think about how they expect them to behave under lateral pressure and how they will affect each other. They design experiments, run the experiments and then do lab write-ups. Depending on your emphasis, you can use this to help teach folding mechanics, rheology, why beds deform the way they do, decollements (pudding works great), deformation mechanisms, folding and even more. It is a single lecture activity, though the lead-in lecture and activity and clean-up take about 40-50 minutes.
Seismic Wave Races part of Cutting Edge:Structural Geology:Structure, Geophysics, and Tectonics 2012:Activities
This is an in class activity designed to help students discover WHY P and S waves behave the way they do and how they are affected by their environment. It also goes into how we use seismic waves to determine the geologic structure of the earth (on a very basic level). Key words to describe this activity are; seismic, P-wave, S-wave, interior of the earth, and geophysics.