At first the U.S. Geological Survey reported a 2.1 magnitude earthquake took place yesterday just to the west of Maryville.

Now the organization said last night the shaking was caused by a quarry blast.

Vulcan Materials Company in Blount County said their quarry had not pulled off any blasts of any kind yesterday. In a statement released, company officials said even if the quarry had set off a blast, it would not have been strong enough to register as an earthquake or be heard and felt as far as the booms were because they are small and controlled.

Hundreds of people reported feeling the tremors and hearing the booms.

No injuries were initially reported.