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those look like multiple datasets of multiple ship tracks. When ships sound the ocean floor it's a lot more accurate than when we do it by satellite.
Quoting from livescience.com:
The program now has 15 percent of its seafloor image taken from shipboard soundings at a 0.6-mile (1 km) resolution. Previous versions took only 10 percent of seafloor imaging from sonar soundings and the rest from extrapolations by scientists using satellite data.
a place to start, anyways
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