Open AccessSignal Generated Seismic Noise *
Author(s) -
Hudson J. A.,
Knopoff L.
Publication year - 1966
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1966.tb03490.x
Subject(s) - seismic noise , geology , seismology , noise (video) , acoustics , seismic interferometry , signal (programming language) , geophysics , computer science , interferometry , physics , artificial intelligence , optics , image (mathematics) , programming language
Summary A typical seismic pulse generates a certain amount of incoherent wave‐motion due to the scattering effect of small variations in the elastic properties of the Earth. This is recorded as‘noise’along with the main signal. When the problem is treated statistically, mean square amplitudes of the scattered waves, and fluctuations in amplitude and phase of the incident signal, can be calculated for wave‐motion which is simple‐harmonic in time. The results at low frequencies for an incident plane wave in an unbounded medium have already been reported. Extension to higher frequencies shows that the Rayleigh fourth‐power law holds only for wavelengths greater than the linear extent of the scattering centres. If the inhomogeneities lie near a plane free surface, Rayleigh waves are generated. Amplitudes have been calculated for incident plane P and S waves.