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 Christian High School of about 110 students. The academic, residential and extracurricular programs are outstanding. There are about 30 international students at the school and they hold 15 different passports. Although the school was started by members of the Church of Christ — all faith backgrounds are welcomed. Great Lakes Christian High School Great Lakes Christian High School is a private Christian high school in Beamsville, Ontario affiliated with the Churches of Christ. Great Lakes Christian High School began operation in 1952 on the former estate of S.T. Creet, who had purchased the property from the estate of Senator William Gibson in 1918].