CHICAGO (AP) — 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.READ MORE: Alphonso Joyner, 23, Charged With Shooting And Killing 71-Year-Old Woom Sing Tse In Broad Daylight In Chinatown
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.READ MORE: Chicago Weather: Increasing Clouds Wednesday Night, Snow Flurries Possible Thursday Morning
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.MORE NEWS: View Live Radar
There were no reports of damage or injuries.