Conclusions

Variations in the temperature and salinity of seawater generate velocity anomalies of the order of a few m/s that cause recordable reflections of acoustic waves in the seismic exploration frequency range. Imaging these bodies of seawater can provide useful insight into ocean dynamics. A specific processing flow is designed to enhance the visibility of these reflections, by eliminating shot noise with prediction error filters. The presence of velocity variations with depth and midpoint is shown in semblance scans and angle-domain common image gathers. Wave-equation migration velocity analysis is proposed as a possible tool for resolving the thermohaline acoustic velocity structure of seawater.