un seismal

seismic

[sahyz-mik, sahys-]
adjective
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:
1855–60; seism + -ic

seismically, adverb
nonseismic, adjective
unseismal, adjective
unseismic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
seismic (ˈsaɪzmɪk)
 
adj
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
 
'seismically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

seismic
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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