Igbi Island, a remote island located in the middle of the South Pacific Ocean, is notorious for its extremely powerful megatsunamis, huge, deadly waves averaging 500 feet (≈ 150m), but sometimes reaching astonishing of 2000 feet (≈ 600m) that occur every week. Scientists have yet to explain this phenomena.
Recently, a sensational discovery was made. Scientists found vast deposits of diamond and gold and other precious metals and stones at Igbi Island using science-y stuff. This has caused tycoons to go crazy trying to find a way to safely live on Igbi Island, so they can mine all of the precious metals and stones.
Assuming that you have unlimited money (the precious stones and metals provide an endless amount of profit), modern day technology, and three tsunami-free months to build, how could you tsunami proof Igbi Island, so that people could live there?
Igbi Island is circular and doesn't have any mountain ranges. There are a few small lakes and ponds on the island and one large river that splits the entire island in half. It has a diameter of 6 mile diameter, and a land area of roughly 28 miles2. There will be skyscrapers, but none will be taller than 500 feet.