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when the earth shake
| Term | Definition |
|---|---|
| fault | a fracture on bedrock,along which blocks of rock on opposite sides of the fracture move. |
| intensity | a measure of the damage done by an earthquake that is determined on the basis of the earthquakes 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 ssea waves caused by undersea event, such as an earhtquake beneath the ocean floor, that rise to great heights as they near a shore |
| seismogram | the record made by a seismograph; the paper on which data about earthquake waves is recorded |
| seismograph | an instrument used to detect earthquake waves |
| tension | earthquakes caused by tensional stress, where forces pull the Earth's crust apart, causing stretching and thinning, leading to normal faulting and the formation of features like rift valleys, with the sudden release of energy causing the quake |
| compression | earthquakes caused by compressional stress, where tectonic forces squeeze rocks together, causing them to fold, fracture, and slip along faults, like reverse or thrust faults, releasing 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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