This PowerPoint presentation covers the basics of Cascade volcanoes and volcanic hazards. The presentation was developed by Beth Pratt-Sitaula and Jenda Johnson with assistance from Denise Thompson. Before veiwing this PowerPoint presentation, viewers are encouraged to review the PDF Introduction to Pacific Northwest Plate Tectonics, Earthquakes, and Volcanoes under the Cascadia Earthquakes and Tsunamis topic.
Earthquakes of small magnitude and shallow depth often occur beneath volcanoes that are approaching eruption. These earthquakes are caused by heating of rocks beneath the volcano as magma works its way up into shallow chambers beneath the volcano and by pressure changes within the rising magma. This animation explains the principles of seismic monitoring of volcanoes. The animation was developed by the Mt St Helens Institute, US Geological Survey Johnston Ridge Observatory, IRIS, and EarthScope.
This animation shows the three-dimensional views of the Cascadia subduction zone. The Juan de Fuca Plate is created at the Juan de Fuca Ridge, then subducts beneath the Pacific Northwest portion of the North American Plate. The location of earthquakes, generation of magma, upward migration of magma, and eruption of Cascade volcanoes are illustrated.
Virtual Field Environment of field locations explored during TOTLE summer workshops. Effective use of this teaching resource requires DSL internet connection or faster internet connection. Your browser needs to have Adobe Flash Player installed.
Roger Groom (Science teacher at Mt Tabor Middle School in Portland, OR) explains Parts 3, 4, and 5 of the Cascadia GPS Gumdrop Lesson Plan. Part 3 deals with how time-series graphs show the motion of a GPS receiving station. Part 4 shows how to help students determine the direction and rate of movement of a GPS receiver from the time-series graphs. Part 5 demonstrates how students can compare the motions of GPS receivers at various distances from the Pacific Northwest coast to visualize how the margin of the North American Plate is being squeezed by the northeasterly motion of the Juan de Fuca Plate.
Roger Groom (Science teacher at Mt Tabor Middle School in Portland, OR) explains the organization of the Cascadia GPS Gumdrop Lesson Plan. Part 1 explains the materials and construction of the gumdrop model of a GPS receiver. Part 2 explains a classroom demonstration showing how distances from three GPS satellite to a GPS receiver uniquely locates that receiver location.
The basics of reading GPS time series plots are explained in this step wise, thorough, and nicely illustrated PowerPoint presentation developed by Shelley Olds at UNAVCO. This PowerPoint presentation can be used to support the Cascadia GPS Gumdrop Lesson Plan or simply for additional information for the teacher.
This PowerPoint presentation contains GPS time series plots for 10 Plate Boundary Observatory stations across the states of Washington and Oregon. These include four coastal stations (Neah Bay, Pacific Beach, Tillamook, and Newport); three stations in the urban corridor (Tumwater, Kelso, and Corvallis); and three stations located east of the Cascade Mountains (Othello, Wasco, and La Grande). Line fits to the north and east components of motion of these stations are shown and rates of north and east motion are provided for each station. Slide #1 is a map of the GPS station locations; Slide #32 is the same map with GPS velocity vectors plotted on the map; Slide #33 is a grid that can be used to plot the north and east components of motion and graphically add the components to determine the velocity vector in the horizontal plane.
This file is a zipped collection of PowerPoint Presentation along with associated QuickTime animations. The PowerPoint is 36 slides on the Japan magnitude 9.0 earthquake and resulting tsunami with comparisons to Cascadia past and future great earthquakes and tsunamis. You are welcome to download the zipped archive and use any or all elements for your own educational purposes. Please acknowledge Teachers on the Leading Edge as the source.
NOTE: If you download the PowerPoint and QuickTime files to a PC, you will likely need to reinsert the animations into the PowerPoint slides OR perhaps run the QuickTime animations in a MediaPlayer window rather than within PowerPoint.
This PDF provides a brief (12 page) introduction to regional plate tectonics, earthquakes, and volcanoes of the Pacific Northwest. The focus is mainly on the subduction zone (coast to Cascade Mountains) because that is where most of the earthquakes and volcanoes occur, and where tsunamis can be generated. This information was gathered and repurposed by Jenda Johnson and Bob Butler from the Pacific Northwest Seismograph Network (www.pnsn.org/), the U.S. Geological Survey (www.usgs.gov), and from two books: Orphan Tsunami of 1700, by Brian Awtater and others, and At Risk: Earthquakes and Tsunamis on the West Coast by John Clague and others.