Who settled pitcairn island? when and why did they settle there?

The mutinous crew of the HMS Bounty settled the island. They settled it when they found it accidentally and realized that it was shown in the wrong place on their Maps. Then they knew that nobody would ever find them there. Today, just about everybody who lives on the island is descended from the crew of the Bounty, and I think the majority of them have the family name "Christian", after Fletcher Christian, the officer who led the mutiny.

Answer collision and mountain formation;