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Boundary Integral Equation Method is usually applied in
problems with full and half space because of the ability to
reduce the dimension of problems by one. In this paper, the
Indirect Boundary Element Method formulated by the use of
single-layer potentials, i.e. a distribution of sources placed
on boundary surfaces, is used to solve the problems of site
effect due to the plane harmonic SH waves. Form the numerical
solutions, there may be likely to generate a 'rule of thumb'
that an accurate solution can be obtained when the ratio of a
wavelength. Also, the numerical solutions obtained by the
quadratic elements is more accurate than those obtained by the
constant elements.
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