Magnetics, gravity and sub-bottom profiler data from RRS James Cook expedition JC228, Guatemala Basin (2022-2023)

Magnetics, gravity and sub-bottom profiler data were acquired during RRS James Cook expedition JC228 (December 2022 to January 2023) in the Guatemala Basin region of the North Pacific Ocean. Magnetics data were acquired using a Marine Magnetics Seaspy 2 magnetometer towed 270 m behind the ship. The data were screened post-cruise and corrected using IGRF14 predictions. Gravity data were acquired using a Dynamic Gravity Systems AT1M marine gravimeter, and underwent post-cruise screening and processing. Sub-bottom profiler data were acquired using a Kongsberg SBP27, and again underwent post-cruise screening and processing. The aim was to sample fast-spreading ocean lithosphere of the northern Cocos Plate from its formation to subduction in the Mid-America Trench, and to investigate the evolution of oceanic lithosphere as well as provide essential site survey information for two IODP Proposals: the flagship MoHole to Mantle initiative (M2M; IODP-805MDP) and the Bend Fault Serpentinization experiment (approved IODP-876Pre). The work was undertaken by scientists at the University of Southampton, UK in collaboration with GEOMAR Helmholtz Centre for Ocean Research, Germany, funded as part of NERC grant ‘From Ridge to Trench, MoHole to Bend-Faults’, grant reference NE/M021246/1. Access to raw 'post-cruise' file versions, navigation and logs available on request via https://dx.doi.org/10.5285/3b4d4347-d2ec-2a6a-e063-7086abc0145d.