High-resolution gridded multibeam bathymetry data (ASCII format) of Pacific seafloor in the region of the old ORCA OBS array (31S,158W to 38S,152W)

The bathymetry was mapped with a Simrad EM122 multibeam system (1° x 2° system, 12 kHz swath mapping) in Nov/Dec 2019, and processed for quality control through QIMERA software while onboard the vessel. In addition to tracks between ocean bottom seismometer drop sites associated with the Old ORCA experiment (a US contribution to the PacificArray initiative), this data set contains multibeam swath passes within the field region, and on transits to/from Tahiti, and to/from a rescue at ~30S,153W. Sippican MK-21/PC-based XBT measurements were conducted at least daily to account for varying sound speed throughout the experiment, and processed through Simrad SIS software. The final bathymetric maps and grids were created using MATLAB and GMT. The data files are in ASCII format. The files with file name suffix ".xyz" are in UTM meters (zone 6 S). The files with file name suffix ".laloxyz" include geographic latitude and longitude coordinates in decimal degrees, as well as UTM meters. The "km1922_all" files contain bathymetry for the entire cruise mapped at 50 m resolution, and the "obs_array" files contain bathymetry for just the OBS array region, at 100 m resolution. The data files were generated as part of a project called Imaging small-scale convection and structure of the mantle in the south Pacific: a US contribution to international collaboration PacificArray, and Seismological Components of the MELT Experiment on the Southern East Pacific Rise. Funding was provided by NSF awards OCE16-58491, OCE16-58214 and OCE94-02375.