GPS monitors deformation in subduction zone: Part B, using real data

6min 46s Novice

Instructional video shows how to conduct 5-step student activity to build gum-drop GPS station, learn how GPS works, then model and graph the GPS movement.

Part A, covered the steps to build and use a gumdrop GPS station.

In this video, Part B, students learn how to read time-series plots and understand how we know the ground is moving.

Demonstration by Roger Groom, Mount Tabor Middle School, Portland OR. Winner of the 2009 NAGT Earth science teacher award.

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Subduction zones show that there are 3 distinct areas of movement in the overlying plate:

  1. constant movement above the locked leading edge,
  2. see-saw pattern of back-&-forth movement above a zone that alternately locks then slips, and
  3. no movement far inland above the deeper part of the diving oceanic plate.
Animation Novice