Date: September 15, 1972
Location: Northern Illinois
Milwaukee Journal, Saturday, September 16, 1972.
Quake Jolts Nerves, but Little Else.
A minor earthquake rattled doors and jangled nerves in Wisconsin and at least three nearby states shortly after 12:20 a.m. Friday.
There were no injuries and no major damage.
Carl Stover, a geophysicist at the National Earthquake Information Center in Boulder, Colo., said reports indicated that the shock occurred about 12:21 a.m.
Milwaukee Weatherman Ray Waldman, a veteran of many earthquakes in The Philippines, was watching television at his home when the shock reached Milwaukee. He recorded the time as 12:23 a.m.
Seismograph readings from points as far apart as New York and Nevada were fed into a computer at the earthquake center, which plotted the shock center at 41.6 degrees north latitude and 89.4 degrees west longitude, near Sterling, Illinois.
Stover said the force was near 4.5 on the Richter Scale. This would make the quake considerably less forceful than the one felt here on November 9, 1968.
(The initial parts of the UW-Milwaukee Geology Department's seismograph were installed during the day on Friday, September 15, 1972. This was the first earthquake recorded at the UW-Milwaukee seismic station.)