Background
An earthquake is a sudden movement of the Earth caused by the abrupt
release of strain that has accumulated over a long time. The forces
of plate tectonics cause huge slabs of lithosphere to slowly move over,
under, and past each other. Sometimes the movement is gradual. At other
times, the slabs are locked together, unable to release the accumulating
energy. When the accumulated energy becomes larger than the friction
holding the sides together, the sides break free. An earthquake in a
populated area may cause many deaths and injuries and extensive property
damage.
Geologists are able to estimate the locations, size, and probability
of future damaging earthquakes, but predicting when an earthquake will
occur is not and may never be possible. Geologists and engineers have
identified soil types that pose the greatest hazard to human structures,
and are working to design structures that can withstand the effects
of earthquakes.
Objective
Students will observe fault movements on a model of the earth's surface.
Time Needed
1 or 2 class periods
Materials Needed
Per class
- Physiographic map of the world
Per group
- Crayons or colored pencils
- Scissors
- Tape or glue
- Metric ruler
- Card stock or construction paper
- Fault
Model Sheet
Instructions
- Have students work in pairs or small groups.
- Display the fault models in the classroom after the activity.
- An excellent world physiographic map showing the ocean floor can
be obtained from the National Geographic Society.
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