What was that loud noise and rumble in Evansville Friday morning?

EVANSVILLE – A mysterious boom that rattled through the Evansville area isn't a mystery at all.

Residents from Posey County, Indiana, to the East Side of Evansville took to social media Friday morning to see if anyone else felt a rumble just before 9 a.m. Some wondered if it was an earthquake.

The Evansville-Vanderburgh County Emergency Management Agency checked the University of Southern Indiana's seismograph and found nothing.

Turns out, the shaking came from above ground.

According to the EMA, the tremors residents felt likely originated from the implosion of an old mine silo in Wabash County, Illinois. The sheriff's office there posted on Facebook that a crew took down the silo and another structure about 9 a.m. − the same time residents here felt the shaking.

"The blast was successful in bringing down the structures," the post read.

The concerns about an earthquake are more than fair. Evansville sits near two major seismic zones: The Wabash Valley and the New Madrid.

Damage would 'blow people's minds': How a major earthquake could devastate Evansville

The latter gets more attention thanks to a historic quake it produced in the early 1800s – as well as a bogus apocalyptic prediction from Iben Browning, who said, with no evidence, that the New Madrid would cough up a giant quake on Dec. 3, 1990 and decimate huge swaths of the Midwest. Thankfully, that never came to pass.

But it's the Wabash Valley Seismic Zone that could do the most damage if it ever unleashes its full potential, geologists have told the Courier & Press.

This time, though, there's nothing to worry about.

This article originally appeared on Evansville Courier & Press: Evansville earthquake? Here's what really caused the loud boom