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Earthquake
| Description | Term |
|---|---|
| Vibrations in the earth caused by the sudden movement of rock is called | earthquakes |
| The elastic rebound theory states that as a rock becomes stressed, it first | deforms |
| The point along the fault where an earthquake begins is called the | focus |
| The point on the earth's surface directly above the point where an earthquake begins is called the | epicenter |
| A characteristic of earthquakes that causes most severe damage is | a shallow focus |
| Most severe earthquakes occur | at plate boundaries |
| P waves travel through | both solids and liquids |
| S waves cannot pass through | the asthenosphere |
| The Richter scale expresses the earthquake's | magnitude |
| Most injuries in earthquakes are caused by | a collapse of buildings |
| If an earthquake stikes you while you are in a car, you should | stop the car in a clear space and remain in the car |
| A quake of lesser magnitude, usually one of a series, following a large earthquake in the same area | aftershock |
| A sudden movement of the earth's crust caused by the release of stress accumulated along geologic faults or by volcanic activity | earthquake |
| theory that rocks that are strained pass a certain point will fracture and spring back to their original shape | elastic rebound theory |
| The point of the earth's surface directly above the focus of an earthquake | epicenter |
| A point at which rays of light or other radiation converge or from which they appear to diverge, as after refraction or reflection in an optical system | focus |
| amount of damage caused by an earthquake | intensity |
| surface or long wave | L wave |
| scale that expresses the intensity of an earthquake with a Roman numeral and a discription | mercalli scale |
| primary wave | p wave |
| major earthquake zone that forms around the pacific ocean | Pacific ring of fire |
| scale that expresses the magnitude of an earthquake | richter scale |
| secondary wave | s wave |
| zone of rock in which a fault is locked and unable to move | seismic gap |
| An instrument for automatically detecting and recording the intensity, direction, and duration of a movement of the ground, especially of an earthquake | seismograph |
| A very large ocean wave caused by an underwater earthquake or volcanic eruption | tsunami |
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bahginia
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