Seismogram

Seismogram

A seismogram is a graph output by a seismograph. It is a record of the ground motion at a measuring station. The energy measured in a seismogram may result from an earthquake or from some other source, such as an explosion.

Historically, seismograms were recorded on paper attached to rotating drums. Some used pens on ordinary paper, while others used light beams to expose photosensitive paper. Today, practically all seismograms are recorded digitally to make analysis by computer easier. Some drum seismometers are still found, though, especially when used for public display. They are essential to measuring earthquakes with the Richter scale.

External links

* [http://www.thetech.org/exhibits/online/quakes/grams/ An example seismogram]
* [http://rev.seis.sc.edu REV, the Rapid Earthquake Viewer] Seismograms recorded around the world from recent earthquakes (weeks old) as well as larger earthquakes from the past.


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Look at other dictionaries:

  • Seismogram — Seis mo*gram, n. [Gr. ? earthquake + gram.] (Physics) The trace or record of an earth tremor, made by means of a seismograph. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • seismogram — 1891, from SEISMO (Cf. seismo ) + GRAM (Cf. gram) …   Etymology dictionary

  • seismogram — [sīz′mə gram΄, sīs′mə gram΄] n. [ SEISMO + GRAM] the chart of an earthquake as recorded by a seismograph …   English World dictionary

  • seismogram — s ( met, seismogram, best. pl. men) kurva från seismograf …   Clue 9 Svensk Ordbok

  • seismogram — seismograma statusas T sritis Standartizacija ir metrologija apibrėžtis Seismografu nubrėžta žemės plutos svyravimo kreivė. atitikmenys: angl. seismogram vok. Seismogramm, n rus. сейсмограмма, f pranc. séismogramme, m; sismogramme, m …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • seismogram — noun Etymology: International Scientific Vocabulary Date: circa 1891 the record of an earth tremor by a seismograph …   New Collegiate Dictionary

  • seismogram — /suyz meuh gram , suys /, n. a record made by a seismograph. [1890 95; SEISMO + GRAM1] * * * …   Universalium

  • seismogram — noun The graphical out put from an accelerograph or seismograph. Syn: accelerogram See Also: seismograph …   Wiktionary

  • seismogram — n. visual record of earthquakes and seismic activity …   English contemporary dictionary

  • seismogram — [ sʌɪzmə(ʊ)gram] noun a record produced by a seismograph …   English new terms dictionary

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