Modelling of scattering of seismic waves from a corrugated rough sea surface: a comparison of three methods |
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Authors: | Johan O A Robertsson Robert Laws Chris Chapman Jean-Pierre Vilotte Elise Delavaud |
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Institution: | WesternGeco Oslo Technology Centre, Schlumberger House, Solbråveien 23, 1383;Asker, Norway. E-mail: Schlumberger Cambridge Research, High Cross, Madingley Road, Cambridge CB3 0EL,;UK Institut de Physique du Globe de Paris, 4,;Place Jussieu, 75252 Paris cedex 05, France |
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Abstract: | We compare three numerical methods to model the sea surface interaction in a marine seismic reflection experiment (the frequencies considered are in the band 10–100 Hz): the finite-difference method (FDM), the spectral element method (SEM) and the Kirchhoff method (KM). A plane wave is incident at angles of 0° and 30° with respect to the vertical on a rough Pierson–Moskowitz surface with 2 m significant wave height and the response is synthesized at 6, 10 and 50 m below the average height of the sea surface. All three methods display an excellent agreement for the main reflected arrival. The FDM and SEM also agree very well all through the scattered coda. The KM shows some discrepancies, particularly in terms of amplitudes. |
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Keywords: | finite-difference methods numerical techniques rough surface seismic modelling seismic wave propagation synthetic seismograms |
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