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Title: Effects of source and cavity depths on wave fields in homogeneous half spaces
Authors: Chai, H.-Y.
Goh, S.-H. 
Phoon, K.-K. 
Wei, C.-F.
Keywords: Buried source
Green's functions
Rayleigh waves
Scattered waves
Thin layer method
Issue Date: Jun-2013
Source: Chai, H.-Y., Goh, S.-H., Phoon, K.-K., Wei, C.-F. (2013-06). Effects of source and cavity depths on wave fields in homogeneous half spaces. Journal of Applied Geophysics 93 : 52-59. ScholarBank@NUS Repository.
Abstract: In homogeneous half spaces excited by small buried, spherically symmetric P-wave sources, Rayleigh waves (R-waves) could be generated. The effects of the source depth on the induced wave pattern and propagation behavior of R-waves are analyzed using the thin layer method. When a cavity is present in a homogeneous half space, R-waves could be formed in the scattered wave field. It is found that the energy of R-waves in the incident (direct) surface wave-field is related to the ratio of the source depth to the wavelength of R-waves; R-waves have relatively strong energy when the ratio is less than 1; the buried source induced R-waves approximately travel at the velocity of the planar R-waves in the range of the offset beyond about one wavelength; the energy of R-waves in the back-scattered surface wave-field depends on the ratio of the depth of cavity to the wavelength of R-waves; and for the case of the cavity presented at depths less than one wavelength, R-waves can be clearly observed in the back-scattered wave field. The results are helpful for selecting the source depth and the frequency component in seismic surveys and interpreting both the incident wave and the scattered wave patterns. © 2013 Elsevier B.V.
Source Title: Journal of Applied Geophysics
ISSN: 09269851
DOI: 10.1016/j.jappgeo.2013.03.009
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