Sea surface profile and reflection coefficient estimates are vital input parameters to variousseismic data processing applications. The common assumption of a flat sea surface whenprocessing seismic data can lead to misinterpretations and mislocations of events. A newmethod of imaging the sea surface from decomposed wavefields is presented. Wavefieldseparation is applied to the data acquired by a towed dual sensor streamer containingcollocated hydrophones and geophones to obtain the up- and down-going wavefields of therelated sensors. The up- and down-going wavefields of a given sensor are extrapolated to thesea surface where an imaging condition is applied in order to obtain the sea surface profile.The image points values obtained at the sea surface are the reflection coefficient values ofthese points. Ray tracing and finite difference methods are used to generate differentcontrolled data sets employed in this feasibility study to demonstrate the imaging principleand to test the image accuracy. Finally, a first field data example of a marginal weather linefrom the Norwegian North-Sea is presented.