This data set was acquired with the LDEO Multi-Channel Seismic system during R/V Marcus G. Langseth expedition MGL1112 conducted in 2011 (Chief Scientist: Dr. Bernard Coakley). These data files are of UKOOA P1/90 format and include Seismic Navigation data that have not been processed. Data were acquired as part of the project: Plate Boundaries around the Chukchi Borderland, and funding was provided by NSF grant: ARC09-09568.