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Episodic Tremor and Slip: the Case of the Mysterious Earthquakes
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Version March 2011
Here are the educational materials for the activity Episodic Tremor and Slip: the Case of the Mystery Earthquakes and the associated activities on "Gumdrop Introduction to GPS" and "Locked and Loaded" as described in the article, "Episodic Tremor and Slip in a Middle School Classroom?", in the Spring 2011 issue of The Earth Scientist journal produced by the National Earth Science Teachers Association
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Episodic Tremor and Slip Presentation for Students (v. Mar 2011) [ppt, 33mb]
[pdf, 17mb]
- The slides in this presentation guide the student through an exploration of the subduction zone in the Cascadia region of the Pacific Northwest in the United States. They explore the process of science and scientific collaboration through story-discovery and discover Episodic, Tremor, and Slip by studying seismic tremor and slip data. Students forecast which areas will have an ETS event, predict what the GPS data time series plots would look like before, during, and after an ETS event, and calculate the potential slip distance that could occur from a future megathrust earthquake. This discussion can lead naturally into a deeper discussion of societal impacts and steps students can take to mitigate the risks of living in an earthquake hazard zone. ---- Notes for teachers are included in the Notes section of the presentation. --- Be sure to download the animations in this folder.
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Activity Synopsis for Episodic Tremor and Slip (v. Mar 2011) [ppt, 16 mb]
- This presentation provides the teacher a brief run through of the activity.
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Student Worksheet for Episodic Tremor and Slip (v. Mar 2011) [pdf, 1mb]
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Student Worksheet for Episodic Tremor and Slip (v. Mar 2011) [doc, 2mb]
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Answer Key to Student Worksheet Episodic Tremor and Slip (v. Mar 2011) [pdf, 1mb]
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Answer Key to Student Worksheet Episodic Tremor and Slip (v. Mar 2011) [doc, 2mb]
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Gumgrop Introduction to GPS
- The teaching sequence begins with an explanation of how GPS works and how the motion of GPS stations, permanently attached to the ground, can be measured on the scale of millimeters per years. Students interpret GPS data time series plots to determine the motion of different GPS stations.
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Animations for Case of the Mysterious Earthquakes
- Download these animations to show during the Powerpoint presentation.
Locked and Loading: Cascadia GPS Analysis Extension Activity; Using Plate Boundary Observatory (PBO) GPS data to determine elastic compression of the Pacific Northwest Active Continental Margin.
An online step by step guide to finding, downloading, and plotting GPS Time Series Data Earth Exploration Toolbook: Analyzing Plate Motion Using EarthScope GPS Data
PDF of Step by Step section of EET Chapter [pdf]
Additional Resources:
Reading Time Series Plots Reference Key [pdf] ; in Spanish [pdf]
