Mysterious Crack Forms Across Upper Michigan

A crack is forming across the peninsula that is Upper Michigan, close to the Wisconsin border. It's about 200 yards long, 5 feet deep, and growing:

Heider and neighbors heard an explosion-like sound Monday morning. Heider found the nearly 200-yard-long crevice, which measures five-feet deep in parts, Tuesday.

"I was sitting in my recliner and the recliner started to vibrate," said Heider. "And it's not electric."

Trooper Paul Anderson with Michigan State Police was the first to check it out. He said he ruled out a gas line leak, but could not determine much more.

"This would be a first," he said. "You don't learn that at the academy."

Anderson said he called some geological experts. So far none have come to look at the crevice.

There have not been any reported earthquakes in the area.

In the comments, offer scientifically unsound explanations about how this crack formed.

Link via reddit | Image: Encyclopedia Britannica