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 Megalopolis Micropolitan Statistical Areas (independent of the Combined Statistical Areas), as defined by the Office of Management and Budget. The following sortable table lists the 27 statistical areas of the United States located on the Great Lakes with the following information: The following four sortable tables list the 27 census statistical areas of the United States located on the Great Lakes, by lake, with the following information: Great Lakes Megalopolis The Great Lakes Megalopolis consists of the group of metropolitan areas in North America largely in the Great Lakes region and along the Saint Lawrence Seaway. To its south and west,