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PZ summation is a common method for separating the upgoing wavefield from the downgoing wavefield in data acquired by four-component ocean-bottom node surveys. It assumes that the vertical geophone component records mostly pressure waves. If this assumption is not satisfied, non-pressure wave energy (such as shear waves) will be introduced as pressure waves into the receiver wavefield, which may generate artifacts in the migration image. I formulate an elastic Born modeling and migration method for ocean-bottom node acquired data. I then use a synthetic example to demonstrate the effect of the introduction of non-pressure wave energy into the receiver data on the resulting image.