What is Seismometer?
[[Image:Kinemetrics seismograph.jpg|thumb|right|Strong motion seismometer.]] A '''seismometer''' or '''seismograph''' is an instrument that measures motions of the ground, including those generated by [[earthquake]]s, [[nuclear explosion]]s and other sources. Records of seismic waves called [[seismogram]]s allow us to map the interior of the [[Earth]], and to find and measure the size of those different sources.<ref>{{cite book | last = Richter | first = C.F. | title = Elementary Seismology | url = https://archive.org/details/elementaryseismo0000rich | place = San Francisco | publisher = W.H. Freeman | date = 1958}}</ref> The word derives from the [[Greek_language|Greek]] word, ''seismós'', a shaking or quake, from the verb σείω, ''seíō'', to shake; and μέτρον, ''métron'', measure. The technique of using a seismometer to build up a picture of the Earth's interior is called '''seismic tomography'''.<ref>Nolet, Guust (ed) 1987. ''Seismic tomography: seismology and exploration geophysics''. Springer Netherlands. ISBN 9789027725837</ref> ==References== {{reflist}} ==Other websites== {{Commons category|Seismometers}} *[http://neic.usgs.gov/neis/seismology/history_seis.html The history of early seismometers] {{Webarchive|url=https://web.archive.org/web/20030415215731/http://neic.usgs.gov/neis/seismology/history_seis.html |date=2003-04-15 }} *[http://www.ifg.tu-clausthal.de/java/seis/sdem_app-e.html A Java code applet demonstrating the operation of a damped-mass seismometer] *[http://neic.usgs.gov/neis/seismology/keeping_track.html Keeping track] {{Webarchive|url=https://web.archive.org/web/20090201201214/http://neic.usgs.gov/neis/seismology/keeping_track.html |date=2009-02-01 }} [[Category:Earthquakes]] [[Category:Measuring tools]] [[Category:Seismology]]