Seismic Geohazards & Earthquake Hazard Maps: Alaska emphasis

This activity was selected for the On the Cutting Edge Exemplary Teaching Collection

Resources in this top level collection a) must have scored Exemplary or Very Good in all five review categories, and must also rate as “Exemplary” in at least three of the five categories. The five categories included in the peer review process are

  • Scientific Accuracy
  • Alignment of Learning Goals, Activities, and Assessments
  • Pedagogic Effectiveness
  • Robustness (usability and dependability of all components)
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This page first made public: May 24, 2018

Summary

Ground shaking is the primary cause of earthquake damage to man-made structures. This exercise combines three related activities on the topic of shaking-induced ground instability: a ground shaking amplification demonstration, a seismic landslides demonstration, and a liquefaction experiment. The amplitude of ground shaking is affected by the type of near-surface rocks and soil. Earthquake ground shaking can cause even gently sloping areas to slide when those same areas would be stable under normal conditions. Liquefaction is a phenomenon where water-saturated sand and silt take on the characteristics of a dense liquid during the intense ground shaking of an earthquake and deform. Includes Alaska and San Francisco examples.

Context

Audience

These activities can be done with introductory geoscience learners from late elementary through secondary or even early college. They can also work for informal education or public outreach venues as interactive demonstrations.

Skills and concepts that students must have mastered

Learners should know what earthquakes and earthquake waves are.

How the activity is situated in the course

This should probably come later in a unit on earthquakes, when the topic moves from understanding what earthquakes are to how they affect our society. This is a needed intermediate step to considering earthquake mitigation and preparedness.

Goals

Content/concepts goals for this activity

Learner are able to:
  • Describe why different near-surface rocks and soil can lead to different levels of building damage during an earthquake
  • Explain how shaking can lead to landslides
  • Experiment with different soil water contents and observe liquefaction differences

Higher order thinking skills goals for this activity

Analyze experimental results and use the results to justify how water content impacts hazard to buildings.

Other skills goals for this activity

  • Working in groups
  • Using physical models

Description and Teaching Materials

See attached file for educator notes, NGSS alignment, links to supporting resources, student exercise, and answer key.
Seismic Geohazards & Earthquake Hazard Maps Activities (Alaska emphasis) (Acrobat (PDF) 1.8MB Apr2 19)


The same basic suite of activities but with a Pacific Northwest USA emphasis was done by the Cascadia EarthScope Earthquake and Tsunami Education Program (CEETEP)

Teaching Notes and Tips

A number of materials are needed for these demonstrations and activities. See above educator notes.

Assessment

The student exercise serves as the summative assessment for the activity. The answers are short but open ended so the instructor should develop a simple couple-point scale for evaluating the completeness of each answer. Alternatively, if the activity is being used for a demonstration or informal interactive activity, questions and discussions with learners can help the presenter gauge the level of understanding and to address misconceptions.

References and Resources