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Ground Shaking and Damage at Your House

This page is authored by Carla Whittington, Highline Community College (Des Moines, WA)
Dr. Eric Baer (Highline) has contributed in writing the activity.

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Summary

In this activity, students use a seismic hazard map from the USGS to estimate the ground shaking hazard

in their community. The map shows a 10% probability of ground accelerations reaching or exceeding a certain % of gravity within the next 50 years. They then adjust this value for the soil conditions that their house sits on. Once the acceleration hazard is determined, students equate that hazard to the Mercalli Intensity Scale and investigate the potential damage expected at their homes. Students also take into consideration housing types and the weaknesses inherent in different types/ages of structures.

Learning Goals

Content Goals

By the end of this activity, students should be able to:

Skill Building Goals

By the end of this activity, students should be able to:

Higher Order Learning Goals

By the end of this activity, students should be able to:

Context for Use

This activity is appropriate for an introductory level course, however students need some prior knowledge. I have usually covered the concepts of ground acceleration, the Mercalli Scale, and variables that impact ground shaking and seismic intensity values in lecture. In addition, students have previously determined the type of soil/geologic materials underlaying their houses by looking at geologic maps in a previous activity.

Students do need access to a computer for the interactive map. The data gathering from the map and websites takes only 25-30 minutes and can be done in a classroom or at home. Writing the synthesis paragraphs takes a longer time and is usually completed outside the classroom as homework.

Description and Teaching Materials

Ground Shaking and Damage at Your House (Acrobat (PDF) 677kB Apr10 14)
Mercalli Intensity Scale (Acrobat (PDF) 123kB Apr10 14)
Grading Rubric (Acrobat (PDF) 30kB Apr11 14)

Teaching Notes and Tips

Students need internet access and a computer to collect the data and view websites. No special equipment or programs are needed; the assignment relies on data/information freely available on the web. I like to bring the Interactive USGS map up in the classroom before students begin working with it. The view of the map when you first sign on is of the complete United States and this provides an opportunity to have a class discussion about why the seismic hazard varies so much from location to location.

Assessment

I use this as a 15 point assignment. Five (5) points are given for gathering the correct data. Ten (10) points are given to the writing portion of the assignment which includes two synthesis paragraphs: the first where students define the hazard and the second where they describe the potential risk (damage) from the hazard to their home. The writing is graded with a simple rubric based on how well students adhere to assignment guidelines. The grading rubric is attached.

References and Resources

Online resources used or referred to in this activity are:

USGS, 2012, US Seismic Hazard 2008, Earthquake Hazards Program,
http://earthquake.usgs.gov/hazards/apps/map

ABAG (Association of Bay Area Governments), 2003, Impacts of California Earthquakes on Buildings from Shaken Awake
http://www.abag.ca.gov/bayarea/eqmaps/shelpop/bldg.html

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