It's the "big island" in Hawaii, it has a crack across the entire exposed(above sea level) portion. It is also one of the tallest mountains on earth if you measure to the sea floor some 18,000 feet down It is also the most active volcano on earth, and is actually flowing a little heavier than in recent times.
The concern is that "when" this chunk falls off, and it will, that it could create a Hugh" tidal wave. It would be directed towards the west coast of the US, not the east.
Right now I'm far more worried about what our elected MORONS are doing to us in Sacramento.