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Fri November 15, 2013
Scientists Now Say Shaking In Suburbs Was An Earthquake
Scientists of the U.S. Geological Survey say it's likely it was an earthquake that shook Chicago's western suburbs after a blast at a quarry.
USGS scientist Jim Dewey says research indicates quarry blasts don't cause larger follow-up tremors. However, a quarry blast in McCook was followed by a related tremor seven seconds later.
Dewey says USGS scientists now believe the blast triggered a release of tectonic strain at a shallow depth, not miles deep in the earth's crust where earthquakes usually originate.
The USGS and Hanson Materials, owner of the quarry, will install a seismograph in the quarry which will make hourly readings of the earth's behavior.
The Nov. 4 tremor shook several communities southwest of Chicago. There were no reports of damage or injuries.