Abstract
In this paper, the source is assumed to be a more realistic spherical wave than plane wave, and the scattering of spherical P, SV and SH waves by 3D sedimentary basins is studied by using IBEM. The total wave field is decomposed into free wave field and scattered wave field. The free wave field is solved by direct stiffness method combined with Hankel transformation, while the scattered wave field is simulated by dynamic Green's function. The correctness of the method is verified by comparing the results calculated by this method with those in published literature. Taking the model of a semi elliptical sedimentary basin as an example, the effects of source location, incident wave frequency, shear wave velocity ratio between bedrock and single rock on surface displacement amplitude are studied. The results show that: under the incident of spherical wave source, the sedimentary basin has obvious amplification effect on the surface displacement for different source location, and the larger the incident frequency, more obvious the amplification effect is; in the layered half-space, when the incident frequency is low, the shear wave velocity ratio has a significant effect on the basin surface displacement.
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