Abstract：
:The effect of a weak surface, near-surface and interfacial inhomogeneity on the frequency dependence of the surface wave velocity and of the SH (shear horizontal) wave reflectivity in isotropic elastic media is studied analytically and numerically. The inhomogeneity is modeled as an infinite planar layer with continuously varying properties. Weak inhomogeneity may markedly affect the dispersion of the Rayleigh velocity and especially of the reflectivity. It is demonstrated how this effect, particularly pronounced at high frequency, depends on the extent of inhomogeneity. The material data for damaged and ideal concrete and several simple examples of inhomogeneity profiles are utilized for the numerical calculations based on the Peano expansion. The use of explicit low- and high-frequency approximations is also exemplified. Among these, simple WKB asymptotics are shown to be particularly helpful for the Rayleigh velocity in the case of a prominent inhomogeneity attached to the surface and for the reflection on weak interfaces.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Baron C,Shuvalov AL,Poncelet Odoi
10.1016/j.ultras.2006.09.001subject
Has Abstractpub_date
2007-03-01 00:00:00pages
1-12issue
1eissn
0041-624Xissn
1874-9968pii
S0041-624X(06)00358-1journal_volume
46pub_type
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