Kian Event

The Kian Event was a natural explosion that occurred on the uninhabited island of Kian. Today, Kian is no longer existent, because the explosion eradicated the island. The explosion was photographed by a passing jet, 245 miles away, in 1996. The blast caused damage up to 2600 miles away, and broke all windows and damaged the wings of the passing aircraft. It was the largest explosion in USA history.

Cause
The cause of the explosion was magma below the Kian Volcano caused fission with radioactive materials which caused a nuclear implosion. The blast yield was 120Megatons, bigger than any bomb that could ever be made.

Result
Since the island was uninhabited, no died, and only minor injuries were suffered on the passing aircaft (uneasy breathing, medium burns and temporary blindness when the explosion happened).