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P187 MODELING OF SINGLE REFLECTION BY TIP WAVE SUPERPOSITION METHOD USING EFFECTIVE COEFFICIENT Summary. We summarize the results of numerical tests of an improved algorithm for computing synthetic seismograms in 3-D models based on the Tip Wave Superposition Method (TWSM). Compared with earlier versions of TWSM the improvements comprise a generalization of the background theory that also accounts for wave phenomena at critical reflections (head waves) and the replacement of the plane-wave reflection coefficient with the effective coefficient that eliminates diffraction artefacts at critical angles. Introduction. Seismic wave field simulation algorithms are usually developed so that they allow for inversion