Unknown
In:
Wave Motion, San Francisco, Pergamon, vol. 40, no. 1, pp. 57-67, pp. L13314,
(ISSN: 1340-4202)
Publication Date:
2004
Description:
The ellipticity of Rayleigh surface waves, which is an important parameter
characterizing the propagation medium, is studied for several models with increasing
complexity. While the main focus lies on theory, practical implications of the use of
the horizontal to vertical component ratio (H/V-ratio) to study the subsurface structure
are considered as well. Love's approximation of the ellipticity for an incompressible
layer over an incompressible half-space is critically discussed especially concerning
its applicability for different impedance contrasts. The main result is an analytically
exact formula of H/V for a 2-layer model of compressible media, which is a
generalization of Love's formula. It turns out that for a limited range of models Love's
approximation can be used also in the general case.
Keywords:
Horizontal to vertical spectral ratio
;
Nakamura
;
Spectrum
;
NOISE
;
Site amplification
;
Rayleigh waves
;
Velocity depth profile
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