<Tr> <Th> Areas affected </Th> <Td> Minnesota, United States </Td> </Tr> <Tr> <Th> Max . intensity </Th> <Td> VI (Strong) </Td> </Tr> <P> The 1975 Morris earthquake occurred in western Minnesota on July 9 at 14: 54: 15 UTC, or 9: 54 a.m. The strongest instrumentally recorded rupture in the history of the state, it registered at magnitude 4.6 M and had a maximum Mercalli intensity of VI (Strong). It was the first earthquake to be recorded on any seismic instrument in the state since 1917 . Tremors were felt over much of Minnesota, northern Iowa, and the eastern Dakotas . </P> <P> Minnesota is not a very tectonically active state; however, there is at least one fault zone in it, the Great Lakes Tectonic Zone, stretching from Big Stone County and Traverse County to Duluth . Seventeen earthquakes have occurred along the fault, the two largest being the Morris quake and the Staples event of 1917 . However, plotting of the earthquakes suggests that there may be another hidden fault in the state somewhat adjacent to it . </P>

What when and where was the largest earthquake recorded in minnesota over the past 50 years
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