In seismology, a microseism is defined as a faint earth tremor caused by natural phenomena.[1][2] Sometimes referred to as a "hum",[3] it should not be confused with the anomalous acoustic phenomenon of the same name. The term is most commonly used to refer to the dominant background seismic and electromagnetic noise signals on Earth, which are caused by water waves in the oceans and lakes.[4][5][6][7][8] Characteristics of microseism are discussed by Bhatt.[8] Because the ocean wave oscillations are statistically homogenous over several hours, the microseism signal is a long-continuing oscillation of the ground.[9] The most energetic seismic waves that make up the microseismic field are Rayleigh waves, but Love waves can make up a significant fraction of the wave field, and body waves are also easily detected with arrays. Because the conversion from the ocean waves to the seismic waves is very weak, the amplitude of ground motions associated to microseisms does not generally exceed 10 micrometers.
^The American Heritage Dictionary of the English Language (Fourth ed.), Houghton Mifflin Company, 2000
^Ebel, John E. (2002), "Watching the Weather Using a Seismograph", Seismological Research Letters, 73 (6): 930–932, Bibcode:2002SeiRL..73..930E, doi:10.1785/gssrl.73.6.930.
^Ardhuin, Fabrice, Lucia Gualtieri, and Eleonore Stutzmann. "How ocean waves rock the Earth: two mechanisms explain seismic noise with periods 3 to 300 s." Geophys. Res. Lett. 42 (2015).
^Longuet-Higgins, M. S. (1950), "A theory of the origin of microseisms", Philosophical Transactions of the Royal Society A, 243 (857): 1–35, Bibcode:1950RSPTA.243....1L, doi:10.1098/rsta.1950.0012, S2CID 31828394
^Hasselmann, K. (1963), "A statistical analysis of the generation of micro-seisms", Rev. Geophys., 1 (2): 177–210, Bibcode:1963RvGSP...1..177H, doi:10.1029/RG001i002p00177, hdl:21.11116/0000-0007-DD32-8
^Kedar, S.; Longuet-Higgins, M. S.; Graham, F. W. N.; Clayton, R.; Jones, C. (2008), "The origin of deep ocean microseisms in the north Atlantic ocean" (PDF), Proc. R. Soc. Lond. A, 464 (2091): 1–35, Bibcode:2008RSPSA.464..777K, doi:10.1098/rspa.2007.0277, S2CID 18073415
^Ardhuin, F.; Stutzmann, E.; Schimmel, M.; Mangeney, A. (2011), "Ocean wave sources of seismic noise" (PDF), J. Geophys. Res., 115 (C9): C09004, Bibcode:2011JGRC..116.9004A, doi:10.1029/2011jc006952
^ abBhatt, Kaushalendra M (2014). "Microseisms and its impact on the marine-controlled source electromagnetic signal". Journal of Geophysical Research: Solid Earth. 119 (12): 2169–9356. Bibcode:2014JGRB..119.8655B. doi:10.1002/2014JB011024.
Characteristics of microseism are discussed by Bhatt. Because the ocean wave oscillations are statistically homogenous over several hours, the microseism signal is...
constituents of the ocean wave-generated seismic microseism. The strongest of these is the secondary microseism which is created by ocean floor pressures generated...
seismic sources such as volcanic, tectonic, glacial, fluvial, oceanic microseism, atmospheric, and artificial processes such as explosions and human activities...
namely hum, primary microseism and secondary microseism. The table below shows the comparison of frequency range between the microseisms, arranged from increasing...
record many things, and record many little waves, called microseisms. These tiny microseisms can be caused by heavy traffic near the seismograph, waves...
monitoring the power spectral density characteristics of ocean background microseism and Earth's very long period hum at globally and regionally distributed...
energy is also present as pressure oscillations at great depth, producing microseisms. Pressure fluctuations at greater depth are too small to be interesting...
surface waves, fluidity of the Earth's core, generation and propagation of microseisms, submarine explosion seismology, marine gravity surveys, bathymetry and...
Acoust. Soc. Am. 34, 1936–1956 (1962). S. C. Webb, The equilibrium oceanic microseism spectrum, J. Acoust. Soc. Am. 92, 2141–2158 (1992). Gemba, Kay L.; Sarkar...
interior of the Earth at multiple scales using natural (e.g., the oceanic microseism) or artificial (e.g., urban) background noise as a seismic source. For...
reflection of a swell at the shore, and are the source of microbaroms and microseisms. This section considers representative one- and two-dimensional cases...
tests in the one-kiloton range because the frequency spectra overlap. Microseism Benioff H.; Gutenberg B. (1939). "Waves and currents recorded by electromagnetic...
Longuet-Higgins, M. S. (27 September 1950). "A Theory of the Origin of Microseisms". Philosophical Transactions of the Royal Society A: Mathematical, Physical...
infrasonic microbaroms into the atmosphere, and seismic signals called microseisms coupled through the ocean floor to the solid Earth. Clapotis has been...
seismology, and even other phenomena such as ocean waves (the global microseism), the movement of icebergs across the sea floor or in collision with other...
but also used as a tool for investigating nature and source regions of microseisms as well as locating and tracking volcanic tremor and analyzing complex...
to heavy surf on the nearby coast, an effect now called wave-generated microseism. The FER station became inactive in 1962 when advances in seismic technology...
earthquakes worldwide, but also noise generated by a variety of sources (e.g. microseisms or volcanic eruptions). Since GPS signals do not penetrate under water...
– 200 Hz. Waves of lower frequencies (below 1 Hz) are usually called microseisms, and they are normally associated with natural phenomenae, e.g. water...
to the event, as early as July 6, the area was experiencing unusual microseisms recorded at seismic station of the Commission on Volcanology (COMVOL)...
Etude histochimique de la vitamine C dans la glande surrénale. Arch. Anat. microse. 1934, 30, 105 129. .C.P. Leblond. Extra hormonal factors in maternal behavior...
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