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The epicenters show a clear relationship to tectonic features of the state; four epicenters lie along the Great Lakes tectonic zone. [15] Depths are estimated at 5 to 20 km (3 to 12 mi). [ 15 ] The best-documented event occurred on July 9, 1975, near Morris, Minnesota , with a magnitude of 4.6, and a felt area of 82,000 km 2 (32,000 sq mi ...
Location Sense of movement ... Great Lakes Tectonic Zone (GLTZ) 1400: Great Lakes, United States: Tectonic zone: Neoarchean: Great Sumatran Fault: 1650-1900: Sumatra ...
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes spanning the Canada–United States border.The five lakes are Superior, Michigan, Huron, Erie, and Ontario (though hydrologically, Michigan and Huron are a single body of water; they are joined by the Straits of Mackinac).
The next tectonic event was the Great Lakes tectonic zone which began with compression caused by the collision of the Superior province and the Minnesota River Valley subprovince during the Algoman orogeny about 2,700 million years ago; [5] it continued as a pulling apart (extensional) rift from 2,450 to 2,100 million years ago, [6]: 145 ...
The Algoman orogeny added landmass along a border from South Dakota to the Lake Huron region; this boundary is the Great Lakes tectonic zone (GLTZ). [ 5 ] Northeast Minnesota has 2700-million-year-ago exposed rocks formed during volcanic activity that was in the form of seepage of lava from rifts in the sea floor. [ 6 ]
Earthquakes occur when the plates that make up the Earth's crust move around. These plates, called tectonic plates, can push against each other. Earthquakes are most common along fault lines ...
Map showing Earth's principal tectonic plates and their boundaries in detail. These plates comprise the bulk of the continents and the Pacific Ocean.For purposes of this list, a major plate is any plate with an area greater than 20 million km 2 (7.7 million sq mi)
Paleo-Indian cultures were the earliest in North America, with a presence in the Great Plains and Great Lakes areas from about 12,000 BCE to around 8,000 BCE. [citation needed] Prior to European settlement, Iroquoian people lived around Lakes Erie and Ontario, [2] Algonquian peoples around most of the rest, and a variety of other indigenous nation-peoples including the Menominee, Ojibwa ...