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(Virtual) Hawaii: The Great Crack, Ka'ena Point Trail and Petroglyphs
On Big Island...The Great Crack.
Also known as the Hilina Slump...the crack is roughly 5,000 miles in length. The slump is caused by the movement of the Pacific Plate as it moves and erosive behavior of a debris avalanche (or underwater landslide)
The widening (movement) thus far appears to be only about 10 centimetres a year. An undersea formation of a "buttress" may actually prevent future catastrophic detachment.
Since the Crack hasn't widened and a great portion of Big Island swallowed up by the Pacific...and although the crack isn't particularly scenic...there are still those who "Hike the Great Crack", perhaps because it is there.
At some points the crack is very small...at some points sixty feet wide and just as deep. Its scope is very difficult to capture in photographs from the ground.
A better view and some NASA photographs in this article