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Ambient noise, as the rising star of the seismic source for seismic research other than [[earthquake]], accounts for the naturally and anthropogenically produced seismic vibration of the background<ref>{{cite journal |last1=Oakley |first1=David O. S. |last2=Forsythe |first2=Brandon |last3=Gu |first3=Xin |last4=Nyblade |first4=Andrew A. |last5=Brantley |first5=Susan L. |title=Seismic Ambient Noise Analyses Reveal Changing Temperature and Water Signals to 10s of Meters Depth in the Critical Zone |journal=Journal of Geophysical Research: Earth Surface |date=2021-01-13 |volume=126 |issue=2 |url=https://doi.org/10.1029/2020JF005823}}</ref>. This is different from the active seismic source created solely for seismic research or large seismic source from [[earthquake]]. [[Ocean]] is the most dominant natural origin of the ambient noise field<ref name="tonyking4">{{cite journal |last1=Igel |first1=Jonas K. H. |last2=Bowden |first2=Daniel C. |last3=Fichtner |first3=Andreas |title=SANS: Publicly Available Daily Multi-Scale Seismic Ambient Noise Source Maps |journal=Journal of Geophysical Research: Solid Earth |date=2022-12-24 |volume=128 |issue=1 |url=https://doi.org/10.1029/2022JB025114}}</ref>.
Any seismic source is transmitted as either [[Body wave (seismology)|body
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[[File:Overview Seismic Waves.jpg|thumb|Overview Seismic Waves|upright=2.5]]
The dominance of seismic wave transmission of ambient noise depends on several factors, while the research technique would determine the major type of seismic wave collected for ambient noise. For example, seismologists would often use spatial auto-correlation (SPAC) method which involve the collection and analysis of [[surface wave]]<ref>{{cite journal |last1=Nthaba |first1=Bokani |last2=Ikeda |first2=Tatsunori |last3=Nimiya |first3=Hiro |last4=Tsuji |first4=Takeshi |last5=Lio |first5=Yoshihisa |title=Ambient noise tomography for a high-resolution 3D S-wave velocity model of the Kinki Region, Southwestern Japan, using dense seismic array data |journal=Earth, Planets and Space |date=2022-06-20 |volume=74 |url=https://doi.org/10.1186/s40623-022-01654-x}}</ref>.
=== Frequency of ambient noise ===
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