Using
extremely precise measurements of the changing height of the oceans caused by the gravity field underneath it, measured by a host of satellites, researchers have produced a more accurate map of the ocean floor than ever before. And while doing so, they discovered a lot of new landmarks (perhaps more accurately called seamarks) down there.
Seafloor features are revealed by the gravity field (this article has references)
Here's the global image:
You gotta be impressed with the technology.
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