This data set was acquired with the LDEO Multi-Channel Seismic system during R/V Marcus G. Langseth expedition MGL1307 conducted in 2013 (Chief Scientist: Dr. Dale Sawyer). These data files are of UKOOA P1/90 format and include Seismic Navigation data that were processed after data collection. Data were acquired as part of the projects: Seismic Study of the Galicia S Detachment and Two-Ship seismic experiment: OBS instruments tended by F.S. Poseidon, airguns fired from R/V Marcus G. Langseth, and funding was provided by NSF grants: OCE10-30650 and OCE10-31769.