A 3.7 magnitude earthquake epicentered 20 miles north of Pierre rocked north central South Dakota last Thursday, May 30, with shaking felt in Gettysburg and North Eagle Butte, nearly 40 miles away.According to the United States Geological Survey (USGS), the quake struck between Spring Creek and Lake Oahe - about 20 miles northwest of Pierre - at around 2:40 p.m. Lasting just a few second...
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