According to the NASA JPL web-report, Gravity Gradients Frame Oceanus Procellarum, a rift-like ring structure surrounding the Moon's Oceanus Procellarum has been detected as a gravity anomaly by the GRAIL scientific mission (as can be as the dark blue features on the image below).
Image credit: NASA/Colorado School of Mines/MIT/GSFC/Scientific Visualization Studio
What mechanism could have formed the Moon's Oceanus Procellarum rift-like gravity anomalies?
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