torsion seismograph

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• Richter magnitude scale — Part of a series on earthquakes Types Foreshock • Aftershock • Blind thrust Doublet • Interplate • …   Wikipedia

• earthquake — /errth kwayk /, n. 1. a series of vibrations induced in the earth s crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating. 2. something that is severely disruptive; upheaval. [1300 50; ME erthequake …   Universalium

• Seismometer — Seismometers (from Greek Seism the shakes and Metro I measure ) are instruments that measure and record motions of the ground, including those of seismic waves generated by earthquakes, nuclear explosions, and other seismic sources. Records of… …   Wikipedia

• Seismic scale — A seismic scale is used to measure and compare the severity of earthquakes. (For a quick review, see the table of seismic scales at the end of this article.)Two fundamentally different but equally important types of scales are commonly used by… …   Wikipedia

• measuring device — noun instrument that shows the extent or amount or quantity or degree of something • Syn: ↑measuring instrument, ↑measuring system • Hypernyms: ↑instrument • Hyponyms: ↑accelerometer, ↑actinometer, ↑ …   Useful english dictionary

• measuring instrument — noun instrument that shows the extent or amount or quantity or degree of something • Syn: ↑measuring system, ↑measuring device • Hypernyms: ↑instrument • Hyponyms: ↑accelerometer, ↑actinometer, ↑ …   Useful english dictionary

• measuring system — noun instrument that shows the extent or amount or quantity or degree of something • Syn: ↑measuring instrument, ↑measuring device • Hypernyms: ↑instrument • Hyponyms: ↑accelerometer, ↑actinometer, ↑ …   Useful english dictionary