MENOMINEE, MI (AP)-- Faculty and student researchers from Michigan Technological University believe they have figured out how a large crack opened in the ground more five years ago near the Michigan-Wisconsin border.
Since the Upper Peninsula isn't known for its earthquakes, the university's researchers have been studying the 360-foot long crack in Menominee in an effort to determine what caused it in October 2010.
Researchers have determined that a geological pop-up occurred when underground pressure on the limestone rock in the area was released, allowing the crack to form.
Michigan Tech dean of engineering Wayne Pennington tells the news station that a geological pop-up is a unique event because it's usually caused by the removal of a glacier.