Two possible extensions of the commented article are suggested, with the aim to more efficiently couple the source and path simulation on one side, and the site-effect simulation on the other: (1) New excitation lines, surrounding the sedimentary basin, reduce the necessary size of the 2D finite-difference model of the site. They also better represent the 3D nature of the excitation, including the focal-mechanism effect. (2) New (2.5D approximate) equations of motion improve the way the 3D excitation is propagated within the 2D site model. The two suggested improvements can help in solving problems when a purely 2D treatment is oversimplified, but a true 3D treatment is too expensive.

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