Earthquake or quarry blast ?

(Illinois) — The U.S. Geological Survey reports a 2.7 earthquake hit 20 miles west of Chicago at about 1p.m. on Aug. 31.

A La Grange Patch reader e-mailed shortly after 1 p.m. Aug. 31 asking, “Quarry blast or earthquake?”

The reader had been picking up her daughter from school when she noticed staff at Seventh Avenue School, Ideal Elementary School and Gurrie Middle School responding to something that had caused the buildings to shake.

At about 1:30 p.m., staff at Gurrie Middle School said the rumble was believed to be the result of a too-big blast from a nearby quarry in McCook.

A report published by the U.S. Geological Survey, a department within the U.S. Department of Interior, recorded a 2.7 earthquake centered in La Grange at about 1 p.m. on the dot.

According to the report, the earthquake’s exact location was 10 miles west/southwest of Chicago; 15 miles south of Des Plaines; 20 miles northeast of Joliet; 165 miles northeast of Springfield.

Aerial maps shown on the report mark the glowing red center of the quake on quarry property operated by Hansen Material Services, and the report remarks, “Possibly mining-related event.”

La Grange and La Grange Park residents and businesses took to Twitter.com, initially, to find out what had happened, and to share their observations.

La Grange Park Library, 555 N. LaGrange Rd., posted on Twitter that the earthquake “shook the building.”

@SugarMomTreats, whose location is listed as La Grange, Ill., posted on Twitter, “Huge grumble under my house. Everyone on block outside their house.”

At about 4:30 p.m., the reader mentioned at the beginning of this story told La Grange Patch her child who attends Lyons Township High School South Campus, 4900 S. Willow Springs Rd., had also felt the blast.

By: Beth Palmer
Source:
http://lagrange.patch.com/articles/shake-from-todays-earthquake-felt-in-la-grange-la-grange-park-today

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