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or seismal, seismical

[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.
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
Contemporary Examples
Historical Examples
  • The oceanic basin of the Pacific is throughout a region of volcanic upheaval and seismic disturbance.

  • In the process of breaking, vibrations called “seismic waves” are generated.

    Earthquakes Kaye M. Shedlock
  • One received the impression that a seismic disturbance might awaken some show of emotion, but design—never.

    The Flaw in the Sapphire Charles M. Snyder
  • With a dozen such instances the plane of what is called the seismic vertical is established (seismos is the Greek for earthquake).

    Outlines of the Earth's History Nathaniel Southgate Shaler
  • The name signifies 'Heart of the Mountain' and evidently has a seismic meaning.

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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