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Exploring Tectonic Motions of Alaska & Western United States

Goal

Using a map showing the horizontal velocities of GPS stations in the Plate Boundary Observatory and other GPS networks in Alaska and Western United States, students are able to describe the motions in different regions by interpreting the vectors resulting from long-term high-precision Global Positioning System (GPS) data.

Context

Audience

This activity was developed for middle school and high school students, grades 6 - 12. However, its focus on data makes it adaptable for introductory college courses.

Teaching Time

One class session (45 - 55 minutes) or homework.

Skills and concepts that students must have mastered

Students should be able to read maps and understand map scale.

How the lesson is situated in the course

This activity can be used at any time in an earth science class particularly with in a sequence of lessons about plate tectonics. It can be used as an introductory activity for students to explore current plate motions and to learn about compression, extension, and horizontal slip.

Next Generation Science Standards

Performance Expectations: MS-ESS3-2, and HS-ESS1-5.

Objectives

Students will be able to:

• Describe how velocity vectors from GPS stations inform us about tectonic motion and plate boundaries.
• Describe and draw a velocity vector
• Analyze and describe regional plate motion data as represented as vectors.
• Interpret crustal deformation based on velocity vector map.
• Identify, discuss and defend the locations they chose that are most likely to have earthquakes.

Summary

Students analyze data from GPS data represented as vectors on a map of Alaska or western United States to study tectonic motions at plate boundaries and within the North American and Pacific tectonic plates. Students discover whether motion is compressing, extending, or sliding the land within each region of the plate. By observing the vector lengths and directions, students interpret the motion within multiple regions:

• Pacific Northwest (Washington / Oregon / Northern California region)
• Basin & Range (Nevada / Utah region)
• California
To synthesize their findings, students identify two locations most likely to have earthquakes. Students need to be able to defend their choices by providing evidence based on the tectonic motions from the map/poster and seismic hazards. Optionally, students begin the activity by learning about geodesy and GPS and study a physical demonstration to understand the architecture of GPS, from satellites to sensitive stations on the ground.

More about the Velocity Map Posters [html]

Student materials: Western United States

Western United States student Worksheet [pdf]

3 MB • v: August 2016

Western United States student Worksheet [docx]

2 MB • v: August 2016

Seismic Hazard Map of Conterminous United States [pdf]

1 MB • v: August 2016

Map: Tectonic Motions of the Western United States 8.5 x 11-inch version [pdf]

5 MB • v: August 2016

1 MB • v: May 2017

1 MB • v: May 2017

1 MB • v: May 2017

Map: Tectonic Motions of Alaska [pdf]

1 MB • v: May 2017

Module Development

This work is based on materials provided by the UNAVCO Education and Community Engagement Program, and the GAGE Facility supported by the National Science Foundation (NSF) and National Aeronautics and Space Administration (NASA) under NSF award: EAR 1261833. Activity author: Shelley Olds; Poster authors: Beth Bartel, Christine Puskas, and additional UNAVCO staff.