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A faint earth tremor caused by natural phenomena, such as winds and strong ocean waves.

mi′cro·seis′mic (-sīz′mĭk, -sīs′-) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) a very slight tremor of the earth's surface, thought not to be caused by an earthquake
microseismic, ˌmicroˈseismical adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈmaɪ krəˌsaɪ zəm, -səm)

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 + Greek seismós earthquake (see seismic)]
mi`cro•seis′mic, mi`cro•seis′mi•cal, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


an almost imperceptible earth tremor caused by a violent sea storm or an earthquake and detected only by a microseismometer. — microseismic, adj.
See also: Earthquakes
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.microseism - a small earthquakemicroseism - a small earthquake      
earthquake, quake, seism, temblor - shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity
aftershock - a tremor (or one of a series of tremors) occurring after the main shock of an earthquake
foreshock - a tremor preceding an earthquake
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
According to the peer-reviewed journal (https://www.sciencemag.org/news/2019/03/seismic-hum-detected-mars-first-time) Science Mag , the humming sounds are constant minute tremors or microseisms. The sound was detected by NASA's InSight lander after it completed placing its complex seismometer on the surface of Mars.
and Rusajova, J.: 2015, The possible explanation for secondary microseisms seasonal and annual variations.
The number of microseisms increased slightly from November 8 to November 10, but the microseism magnitudes were small (as shown in Figure 4(b)).
The active hypogene speleogenesis at VC is mainly controlled by the upwelling airflow from the zone of fluid-geodynamic influence associated with an active fault with frequent microseisms [26].
It also provides insight into small scale surveys using the Tromino and for looking into factors that can affect microseisms that may have been overlooked or are not well documented.
Based on the typical frequencies of these wave fields, they are categorized into seismic hum (1-20mHz), primary microseisms (0.02-0.1 Hz), and secondary microseisms (0.1-1Hz), as shown in Fig.
As a basis of input data, not only earthquakes but also an ambient seismic noise can be used, which consists of seismic noise proper (microseisms) and human-induced noise (microtremor).
Keith Koper, director of the University of Utah Seismograph Stations, says "microseisms," or relatively small seismic waves, were detected before and after Sandy from North Pacific and North Atlantic storms that never hit land.
The microseisms created by hydraulic fracturing are too small to be felt, or to cause damage at the ground surface or to nearby wells.").
A note on the use of microseisms in determining the shallow structures of the Earth's Crust.