Great Lakes tectonic zone southern Ontario. Several earthquakes have been documented in Minnesota in the last 120 years, with at least six in the GLTZ. The epicenters show a clear relationship to tectonic features of the state; four epicenters lie along the Great Lakes tectonic zone. Depths are estimated at . The best-documented event occurred on July 9, 1975, near Morris, Minnesota, with a magnitude of 4.6, and a felt area of covering parts of four states. Wisconsin has had no earthquakes along the GLTZ, Michigan's Upper Peninsula has had four earthquakes in the vicinity of the GLTZ – Negaunee, Newberry and two in
Great Lakes Higher Education Corporation Great Lakes Higher Education Corporation Great Lakes Higher Education Corporation was one of the largest student loan providers and guarantors in the United States. Headquartered in Madison, Wisconsin, the corporation is non-profit. It was one of the four largest companies which service United States federal student loans: "Great Lakes", Nelnet, Navient, and the Pennsylvania Higher Education Assistance Agency. In 2018, the loan servicing part of the organization was sold to Nelnet. The company sometimes gives education-related grants, with a focus on increasing access to higher education. The former loan servicing arm of Great Lakes, the "Great Lakes Educational Loan Services,