ShakeAlert: Pacific Northwest and the Big Squeeze

Novice

  • Pacific Northwest and the Big Squeeze: Deformation, Earthquakes, and GPS
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In this triad of engaging activities, learners will explore compression patterns and ground deformation related to the Pacific Northwest subduction zone. Through hands-on models, data collection, and vector map analysis, students gain an understanding of how tectonic forces shape the region and the importance of earthquake preparedness.

  1. Introduction to Compression and Ground Deformation (5 Minutes):

   Learners are introduced to the concept of ground deformation by using a simple spring-like model to visualize how distance from the subduction zone boundary affects ground deformation near the boundary. This quick exercise provides a foundational understanding of tectonic forces and how they vary with proximity to the plate boundary.

  1. Data Collection and Model Exploration (30 Minutes): 

   Building on their initial understanding, learners engage in a longer, data-focused activity using a spring model to measure compression. They observe and record how varying distances impact the "ground” deformation in the model, simulating the effects of tectonic plate movement. This hands-on experiment reinforces the real-world concept and encourages critical thinking through data analysis.

  1. Map Analysis and Plate Velocity Comparison (60 Minutes):

   Learners analyze a vector map of Oregon and Washington, examining plate velocities at different locations across the region. This activity deepens their understanding of why compression patterns vary inland, reinforcing the connection between data collected in the model and real-world observations. Finally, students discuss earthquake preparedness strategies, including enabling ShakeAlert-powered alerts to understand how technology can help mitigate risks.

Through this series of activities, learners build a layered understanding of plate tectonics, ground deformation, and earthquake safety, helping them relate scientific concepts to real-world preparedness strategies.

Objectives:

  • Describe, either orally or in writing, how the movement of tectonic plates at a convergent plate boundary can cause crustal deformation by interpreting GPS vector maps.
  • Explain that velocity has two components, the speed and direction of ground movement.
  • Interpret speed and direction of ground motion from GPS ground motion vector maps.
  • Identify regions more likely to have earthquake hazards using relevant GPS evidence.
Kinesthetic Modeling & Interpreting GPS Data Maps
In this activity, learners explore ground deformation at and near plate boundaries using hand and body motions, data from GPS and maps. In the 5-minute activity, learners explore the concept of vectors by kinesthetically enacting ground movement using their body and hand movements. In the 20-minute activity, learners model GPS ground motion in different regions and connect deformation to earthquake hazards. In the 45-minute activity learners distinguish between different boundary types by measuring the vectors within tectonic plates and identify regions with higher earthquake hazards, comparing their findings to earthquake shaking potential maps.
Activities Novice

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