Menominee, MI – To a geologist, a rock is not just a rock, and a big crack in the ground is not what it first seems either. One such split, north of Menominee, Michigan, in the state’s Upper Peninsula, is a large crack that formed in 2010. Not known for its earthquakes, Michigan is considered aseismic, and the Menominee Crack registered the Upper Peninsula’s first recorded earthquake—measured at less than magnitude 1. The feature and its causes were mysterious.
Now, researchers from Michigan Technological University think they have identified what the feature is: a geological pop-up. The unusual structure is often found at the base of quarries or where glaciers have recently receded. The team, led by Wayne Pennington, dean of the College of Engineering at Michigan Tech, says the Menominee Crack is a one-of-a-kind feature as far as they can tell.
To view the full story and photos, check out mtu.edu/news.
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