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This open file comprises approximately 15,000 km2 of SeaMARC II side-scan acoustic imaging data from the northern Juan de Fuca and Explorer Ridges. These data are presented in two formats: a mosaic at a scale of 1:250,000 and individual swath images (10 km x 12 km) at a scale of 1:50,000. A 20-m contour bathymetric map compiled from previously published SEABEAM datais included at a scale of 1:250,000. The individual 1:50,000 acoustic images can be easily cross-referenced to bathymetry by using the 10-m contour SEABEAM maps already published as part of the Juan de Fuca Ridge Atlas series.

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