[sahyz-mol-uh-jee, sahys-]
the science or study of earthquakes and their phenomena.
Also called seismography.

1855–60; seismo- + -logy

seismologic [sahyz-muh-loj-ik, sahys-] , seismological, adjective
seismologically, adverb
seismologist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seismology (saɪzˈmɒlədʒɪ)
the branch of geology concerned with the study of earthquakes and seismic waves

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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American Heritage
Science Dictionary
seismology   (sīz-mŏl'ə-jē)  Pronunciation Key 
The scientific study of earthquakes and of the internal structure of the Earth. It includes the study of the origin, geographic distribution, effects, and possible prediction of earthquakes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
seismology [(seyez-mol-uh-jee)]

The branch of science devoted to the study of seismic waves and the information they provide about the structure of the interior of the Earth.

Note: Our knowledge of the properties of the crust, the mantle, and the core comes from this field.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Seismology detects reflections from places where the speed of sound changes.
If this trend occurs in seismology, that would be a tragedy.
There they searched for data on seismology and electromagnetism.
Improved seismology tools can detect and locate low-yield nuclear explosions.
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