Report: Tremor felt across Chicago area was a quarry blast, not earthquake
McCOOK – An official from Hanson Material Service said a blast occurred at its quarry in McCook shortly after 12:30 p.m. Monday.
"We did blast, but the matter is under investigation, so I can't comment any further," he said.
The blast, initially labeled a 3.7 magnitude earthquake by the U.S. Geological Survey's National Earthquake Information Center before being changed to a 3.2 magnitude quarry blast, was felt across the Chicago area.
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