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| date = | time = | duration = | magnitude = 4.3 Mw 〔 | depth = 〔 | location = 〔 | type = | affected = Minnesota, United States | damages = | intensity = VI (''Strong'') 〔 | pga = | tsunami = | landslide = | foreshocks = | aftershocks = | casualties = }} 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 4.3 on the moment magnitude scale 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. ==Setting== 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1975 Morris earthquake」の詳細全文を読む スポンサード リンク
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