6th grade science-earthquakes
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10 terms
Terms | Definitions |
|---|---|
 earthquake | a shaking of the ground caused by the sudden movement of part of the earth's crust |
| fault | a break or crack in the earth's surace where rocks move |
| focus | the underground point of origin of an earthquake where the rocks break and move (depth) |
| epicenter | the point on the earth's surface directly above the focus of an earhtquake (the distance away) |
| magnitude | the amt. of energy released by the quake (the strength of it) |
| seismic waves | waves of energy that are released during an earthquake |
| seismograph | an instrument that detects and measures seismic waves of an earthquake |
| Richter scale | the scale used to measure the strength or magnitude of an earthquake (uses numbers from 1-10) |
| aftershocks | samller quakes produced after a major quake caused by rock shifting to new positons |
| San Andreas fault | a hige crack that runs through most of California that separates the North American and Pacific plates |
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