World-Wide Standard Seismographic Network

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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
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
seismograph — seismographic /suyz meuh graf ik, suys /, seismographical, adj. /suyz meuh graf , grahf , suys /, n. any of various instruments for measuring and recording the vibrations of earthquakes. [1855 60; SEISMO + GRAPH] * * * Introduction… … Universalium
United Airlines Flight 93 — United 93 redirects here. For the movie, see United 93 (film). For the related made for TV movie, see Flight 93 (TV movie). United Airlines Flight 93 UA 93 s flight path on September 11, 2001 from Newark, New Jersey to Shanksville, Pennsylvania … Wikipedia
Harrisburg, Illinois — For other uses, see Harrisburg (disambiguation). Harrisburg City City of Harrisburg … Wikipedia

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