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time for earthquakes
defintions
| Question | Answer |
|---|---|
| epicenter | point on earths surface directly above an earthquakes focus |
| fault | fracture that occurs when rockes break and that results in relative movement of opposing side;can form as a result of compressin (reverse fault)being pulled apart(normal fault)or shear(strike-slip fault) |
| focus | point deep inside earth where energy is released causing on earthquake |
| lava | molten rock flowing onto earths surface |
| lithosphere | rigid layer of earth about 100 km thick made of the crust and a part or the upper mantle |
| magnitude | a measure of energy release by an earthquake |
| rifts | long crack,fissure or trough that forms between tectonic plates moving apart at plate boundaries |
| seismic waves | earthquake waves,including primary,secondary and surface waves |
| seismic safe | describes the ability of stucter to stand up against to stand up |
| foreshock | A minor, barely detectable earthquake, generally preceding a full-scale earthquake with approximately the same focus. Major quakes may follow a cluster of foreshocks by as little as a few seconds or as much as several weeks. |
| mainshock | The maximum shock in an earthquake event. Sometimes preceded by foreshocks and followed by aftershocks which are of lesser intensity |
| aftershock | a tremor (or one of a series of tremors) occurring after the main shock of an earthquake |
| friction | Friction is the force resisting the relative lateral (tangential) motion of solid surfaces, fluid layers, or material elements in contact. It is usually subdivided into several varieties |
| p-waves | P-waves are type of elastic wave, also called seismic waves, that can travel through gases (as sound waves), solids and liquids, including the Earth. P-waves are produced by earthquakes and recorded by seismometers. ... |
| s-waves | A type of seismic wave, the S-wave, secondary wave, or shear wave (sometimes called an elastic S-wave) is one of the two main types of elastic body waves, so named because they move through the body of an object, unlike surface waves. |
| triangulation | a trigonometric method of determining the position of a fixed point from the angles to it from two fixed points a known distance apart; useful in navigation |
Created by:
nicoleh704
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