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
Kawartha Lakes (Ontario) Kawartha Lakes (Ontario) The Kawartha Lakes (/kə'wɔrθɐ/) are a chain of lakes in south-central Ontario, Canada that form the upper watershed of the Trent River. The lakes are located on the boundary between the Paleozoic limestone regions of the Golden Horseshoe, and the Precambrian granite Canadian Shield of northern and central Ontario. "Kawartha" is an anglicization of the word "Ka-wa-tha" (from "Ka-wa-tae-gum-maug" or "Gaa-waategamaag"), a word coined in 1895 by aboriginal Martha Whetung of the Curve Lake First Nations. It was hoped that the word, which meant "land of reflections" in the Anishinaabe language, would provide a convenient and popular