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Alex, don't over think it too much. This entire area is volcanic. Easter Island is volcanic in origin just like the Hawaiian islands. And for that matter, if you look at the Hawaiian islands on Google maps, you will also find the exact same dome shaped structures all around the islands. These are volcanic domes. Heck, even all around New Zealand you will find the exact same structures. The map data given is very crude and shapes will be very geometric too for underwater. These are not first rate marine maps.
Alex.
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