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[sahyz-mik, sahys-] /ˈsaɪz mɪk, ˈsaɪs-/
pertaining to, of the nature of, or caused by an earthquake or vibration of the earth, whether due to natural or artificial causes.
Also, seismal, seismical.
Origin of seismic
1855-60; seism + -ic
Related forms
seismically, adverb
nonseismic, adjective
unseismal, adjective
unseismic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for seismic
  • Ship traffic, seismic tests and sonar pings can make navigating the seas tricky for whales.
  • Seismometers measure the ground motion that results from seismic waves.
  • In the rocks themselves, these vibrations are called seismic waves.
  • The field was later refined and became known as seismic tomography.
  • seismic waves travel at different speeds and strengths through different material.
  • Nobody foresaw the seismic events of the next eight years.
  • Another type is coastal flooding caused by high winds and tides or by seismic sea waves called tsunami.
  • It refers to the convergence of three big seismic events.
  • The first hint of humanity came with the appearance of an immense grid for seismic testing, laboriously traced through the brush.
  • Estimates vary wildly, depending on everything from a region's temperature fluctuations to seismic activity.
British Dictionary definitions for seismic


relating to or caused by earthquakes or artificially produced earth tremors Also (less commonly) seismical (ˈsaɪzmɪkəl)
of enormous proportions or having highly significant consequences: seismic social change
Derived Forms
seismically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for seismic

1858, from seismo- + -ic.

Online Etymology Dictionary, © 2010 Douglas Harper
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seismic in Science
Relating to an earthquake or to other tremors of the Earth, such as those caused by large explosions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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