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 Theater who credits the Great Lakes Theater Festival for beginning his acting career. Great Lakes Theater was formerly known as Great Lakes Theater Festival, which continues to be its legal name. "Festival" was dropped from the classic theater company’s business name to better reflect its September through May season, and programming format. Arthur Lithgow started what was going to be Great Lakes in the 1950s at Antioch College, in Yellow Springs, Ohio. During the few years in Antioch, all of Shakespeare's plays were performed. The company traveled for performances at Stan Hywet Hall in Akron, the Toledo Zoo, and Cuyahoga Falls.