A new method to combine pressure and vertical and horizontal particle velocities at the ocean bottom is proposed to separate up- and downcoming waves. The method treats the problem in a manner that the total wavefield is accounted for, instead of only in vertical direction as the Barr and Sanders method. In order to support the theory, the scalar relationship between the vector wavefield of particle velocity and the scalar wavefield of pressure is constructed based on Hooke's law. A relationship between the radial component below and above seafloor is constructed accounting for the discontinuity of displacement at a liquid-solid interface. Then the expressions to combine the ocean bottom multicomponent data for the upcoming waves in each component are introduced.
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