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.

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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.

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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.

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There were no reports of damage or injuries.