Ano ang pinakamaliit na kontinente sa mundo? The state averages less than 1 earthquake per year. [4], During the formation of the GLTZ, the MRV protocontinent consumed the Superior province's oceanic crust as the subprovince came in from the south. The outer layer consists of several large, irregularly shaped plates that slide over, under and past each other on top of the partly molten inner layer. [12], A paleostress analysis of the eastern exposures near Sudbury shows continuing dextral offset during the Penokean orogeny.[6]:147. Many tribes even left the region permanently. [13]:9, In the northern Black Hills of southwest South Dakota the 2,600- to 2,560-million-year-old Precambrian crystalline core, the Blue Draw Metagabbro, is a 1 km (0.62 mi) thick layered sill. [6]:145 From about 2,100 to 1,865 million years ago the Wyoming craton drifted in a westward direction until it docked 1,865 million years ago with the Superior province,[13]:10 northwest of its original position. [4] Collision began along the GLTZ around 2,700 million years ago and continued for tens of millions of years. Late-stage dikes and sills of diabase, quartz-feldspar fine-grained instrusive rocks (aplite) and quartz-feldspar-mica coarse-grained intrusive rocks (pegmatite) are common. [13]:2 Intrusion of the 2,475- to 2,445-million-year-old Matachewan-Hearst Mafic Dike Swarm and the 2,490- to 2,475-million-year-old East Bull Lake suite of layered mafic intrusive rocks are interpreted as indicating early Paleoproterozoic, mantle-hotspot driven rifting centered near Sudbury, Ontario, during the onset of Kenorland breakup. Additionally, sonic booms, quarry blasts and other non-earthquake events may have been originally reported as earthquakes, but were later attributed to other causes. Why are there so many faults in the Quaternary Faults Database with the same name? [13]:9, By 2,100 million years ago, the Wyoming craton is thought to have completely separated from the southern Superior province, this is consistent with the occurrence of a 2,076- to 2,067-million-year-old hotspot centered just south of the Superior province and east of the MRV. [8]:3, Most of the region's crystalline rock bodies of Late Archean age are part of the greenstone-granite terrane of northern Minnesota, northwestern Wisconsin and the western part of the Upper Peninsula of Michigan. Ever since the great magnitude 9.2 earthquake shook Alaska 50 years ago today, scientists have suspected that the quake's rupture halted at the southwestern tip of Kodiak Island due to a natural barrier. [8]:8, The Sudbury Basin structure is located in Greater Sudbury[10]:1891 at the erosional boundary between the Archean Superior province and the overlying sequence of early Proterozoic continental margin deposits. Earthquake Information for Wisconsin. The 72 percent probability of a magnitude (M) 6.7 or greater earthquake in the region includes well-known major plate-boundary faults, lesser-known faults, and unknown faults. Many faults are mapped as individual segments across an area. The peak acceleration is the maximum velocity experienced by the ground during an earthquake. For general information about earthquakes, visit the following: Federal Emergency Management Administration, links to local reports of the earthquakes, Frost quakes may be behind Wisconsin cracking sound, Earthquake eyed in mysterious Wisconsin booms, Authorities solve the mystery of town’s odd noises, shaking. Quartz-Feldspar-Mica coarse-grained intrusive rocks ( aplite ) and from the Superior and Wyoming provinces had completely separated movement of in! In area help reveal the latest kinematic ( movement ) and paleostress histories of the fault slips with respect the! 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