This data set was acquired with the LDEO Multi-Channel Seismic system during R/V Marcus G. Langseth expedition MGL1212 conducted in 2012 (Chief Scientist: Dr. W. Steven Holbrook). These data files are of ASCII format and include Seismic Shot Point Navigation data (shot logs). Data were acquired as part of the projects: RAPID: Collaborative Research: A Short, Open-Access 2D MCS Acquisition Program off Washington State and COAST - Cascadia Open-Access Seismic Transects, and funding was provided by NSF grants: N000141010175, OCE11-47762, OCE11-47841, OCE11-49095, OCE11-50628, and OCE11-53563.