Table T1. Data processing sequence.
| Stage | Details |
|---|---|
| Preprocessing | Localizing hydrophone streamer with AEL; assigning geometry to traces |
| Bandpass filter | Frequency range of 80–250 Hz for fine structure or 30–140 Hz mainly for BSR |
| Deconvolution | 200 ms filter length |
| 10 ms gap length | |
| 10% white noise | |
| Bandpass filter | As above |
| Spatial linear signal detector | Velocity filtering in Tau-p domain |
| Rho filter | Restoring frequency spectrum |
| Velocity analysis | Loop as required |
| NMO | |
| Residual static correction | |
| Stacking | |
| Despiking | |
| Optional AGC | 100 ms window length |
| Migration | Stolt migration for best sediment structure or FD migration for amplitude preservation |
| Optional AGC | 100 ms window length |
Notes: Canadian Oceanographical Acoustic Measurement System data from Cruise PGC9902. Alternative bandpass filters were applied dependent on target reflectors. For amplitude preservation, finite-difference (FD) migration was preferred over Stolt migration and automatic gain control (AGC) was not applied. AEL = array element localization, BSR = bottom-simulating reflector, NMO = normal moveout.