Abstract：The seawater depth is a basis for OBC dual-sensor data summing.A seawater depth inversion method based on segmented data cross-bispectrum is proposed in combination with the time series higher-order statistics.First the auto-bispectrum and cross bispectrum of up-going and down-going wave field data are calculated from the segmented OBC data.Then the coherent cross-bispectrum and cross-correlation spectrum are calculated.Finally,the seawater depth is calculated and used for the OBC data summing.The OBC dual-sensor segmented data computation utilizes fully stacking characteristics,which increases the suppression of Gauss random noise.Cross-bispectrum and coherent cross-bispectrum of the higher-order statistics have the advantages of suppressing Gauss and non-Gauss colored noise.Real OBC data seawater depths calculated by the proposed method match very well with measured seawater depths.These inversed seawater depths are used to dual-sensor data summing,and a good suppression of seawater reverberation is achieved,which lays a solid foundation for the subsequent velocity model building and migration.
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