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When the earth shake
| Term | Definition |
|---|---|
| Fault | a fracture in bedrock, along which blocks of rock on opposite sides of the fracture move. |
| Intensity | a measure of damage done by an earthquake that is determined on the basis of the earthquake's effect on people, structures, and the natural environment. |
| magnitude | a measure of the total amount of energy released at the focus of an earthquake |
| destructive | causing damage or injury |
| stress | the amount of force being applied to a rock or surface |
| tsunami | a series of sea waves caused by undersea events, such as an earthquake beneath the ocean floor, that rise to great heights as they near shore |
| seismogram | the record made by a seismograph; the paper on which data about earthquakes waves is recorded |
| seismograph | an instrument used to detect earthquake waves. |
| tension | a pulling force that stretches and thins the Earth's crust, causing rocks to pull apart along faults, often leading to normal faults where one block drops down, releasing energy as seismic waves and causing shaking |
| compression | rocks are squeezed together by tectonic forces, causing them to shorten, fold, or fracture, creating faults that release energy as seismic waves |
| shearing | happens when tectonic plates slide horizontally past each other, causing rocks to slip along a fault with sideways motion |
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