[sahyz-mik, sahys-]
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.

1855–60; seism + -ic

seismically, adverb
nonseismic, adjective
unseismal, adjective
unseismic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seismic (ˈsaɪzmɪk)
1.  Also (less commonly): seismical relating to or caused by earthquakes or artificially produced earth tremors
2.  of enormous proportions or having highly significant consequences: seismic social change

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1858, from Gk. seismos "earthquake," from seiein "to shake." Seismological is attested from 1850; seismometer is from 1841.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
seismic   (sīz'mĭk)  Pronunciation Key 
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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Example sentences
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.
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