1975 Morris earthquake

Earthquake in Minnesota, United States May 2025 July 2023 1975 Morris earthquake United States 1975-07-09 14:54:15 726019 usp0000byg 1975 07 09 9:54 4.6 Mn 8 km on flip 45.5 -96.1 region:US_type:event inline,title Minnesota, United States VI The 1975 Morris earthquake occurred in western Minnesota on July 9 at 14:54:15 UTC, or 9:54 a.m. local time.http://www.mrs.umn.edu/earthquakes/WCtrib.html Region's earthquake stories sought for educational project University of Minnesota Morris Tom Cherveny December 19, 2008 https://web.archive.org/web/20020906055355/http://www.mrs.umn.edu/earthquakes/WCtrib.html 2002-09-06 dead The strongest instrumentally recorded rupture in the history of the state, it registered at magnitude 4.6 Mn 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 but 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. Plotting of the earthquakes suggests that there may be another hidden fault in the state somewhat adjacent to it.http://www.morris.umn.edu/earthquakes/articles/jun1793.html Background on fault . . . ((Morris Tribune)) University of Minnesota Morris June 17, 1993 December 19, 2008 https://web.archive.org/web/20090207095843/http://morris.umn.edu/earthquakes/articles/jun1793.html 2009-02-07 dead Damage The earthquake caused moderate damage and was defined as intensity VI on the Mercalli intensity scale. Minor damage to walls and basement foundations was reported around the epicenter in Stevens County. Damage consisted of cracked plaster, falling items, and pictures being knocked off walls. The quake also cracked the foundations of two homes on East Fifth Street in Morris. Many reports included extremely loud "bangs" and "explosions". These sounds led one to man think that a nearby gas plant had exploded.http://www.mrs.umn.edu/earthquakes/articles/Jul1075Will2.html Quake Brings Mixed Reactions Locally University of Minnesota Morris ((West Central Daily Tribune)) July 10, 1975 December 19, 2008 https://web.archive.org/web/20070707055203/http://www.mrs.umn.edu/earthquakes/articles/Jul1075Will2.html 2007-07-07 dead It was the most intense earthquake recorded in the region; had it occurred in a more populated area it may have caused a larger amount of damage.((Morris Tribune)) http://www.mrs.umn.edu/earthquakes/articles/July9_1975_1.html Earthquake Shock Felt in Area University of Minnesota Morris July 10, 1975 December 19, 2008 https://web.archive.org/web/20021018220242/http://www.mrs.umn.edu/earthquakes/articles/July9_1975_1.html 2002-10-18 dead See also List of earthquakes in 1975 List of earthquakes in the United States References Stover C.W. Coffman J.L. Seismicity of the United States, 1568–1989 (Revised) U.S. Geological Survey Professional Paper 1527 https://books.google.com/books?id=bY0KAQAAIAAJ 1993 United States Government Printing Office 258 External links 726019 Today in Earthquake History – United States Geological Survey Category:1975 earthquakes Category:Earthquakes in the United States Category:Natural disasters in Minnesota Morris earthquake Morris earthquake Morris earthquake