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[mahy-kruh-sahy-zuh m, -suh m] /ˈmaɪ krəˌsaɪ zəm, -səm/
noun, Geology
a feeble, recurrent vibration of the ground recorded by seismographs and believed to be due to an earthquake or a storm at sea.
Origin of microseism
1885-90; micro- + seism
Related forms
microseismic, microseismical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for microseism
  • More dimly perceived still is the source and nature of the ambient noise at periods longer than the primary microseism band.
British Dictionary definitions for microseism


a very slight tremor of the earth's surface, thought not to be caused by an earthquake
Derived Forms
microseismic (ˌmaɪkrəʊˈsaɪzmɪk), microseismical, adjective
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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microseism in Science
A faint Earth tremor, unrelated to earthquakes, caused by natural phenomena, such as winds and strong ocean waves.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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