[mahy-kruh-sahy-zuhm, -suhm]
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.

1885–90; micro- + seism

microseismic, microseismical, adjective
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World English Dictionary
microseism (ˈmaɪkrəʊˌsaɪzəm)
a very slight tremor of the earth's surface, thought not to be caused by an earthquake

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
microseism   (mī'krə-sī'zəm)  Pronunciation Key 
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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Example sentences
More dimly perceived still is the source and nature of the ambient noise at periods longer than the primary microseism band.
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