METHODS

For bathymetry, magnetics, and gravity data, processing was limited to routine shipboard reduction and editing. Track spacing for all MCS grids is 5 km. MCS acquisition used a 10-air gun, 49.4-L array shooting at 37.5-m spacing to a 480-channel, 6-km streamer. MCS processing includes filtering to pass 5-40 Hz, stacking to 80-fold at 6.25-m midpoint spacing, time migration using a finite-difference algorithm with a velocity model based on refraction results, and time-dependent gain to correct for geometric spreading and attenuation. For further details, refer to Hallenborg et al. (in press).

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