Indiana earthquake: a 'very loud boom'

(CNN) -- Debra Sholty was just opening up her business Thursday morning in Kokomo, Indiana, when a 3.8-magnitude earthquake rumbled through the north-central part of the state.

"It was like a huge explosion under your feet," said Sholty, the owner of Hobson Cleaners.

According to the U.S. Geological Survey, the quake struck just before 8 a.m. ET and was three miles deep. The USGS initially reported that the quake had registered a 4.2 magnitude, but later revised the estimate. Its epicenter was located about 15 miles east-southeast of Kokomo, and 50 miles north of Indianapolis.

No damage was immediately reported in Indianapolis, though some residents closer to the epicenter were surprised by the quake's intensity.

There was "a very loud boom," Sholty said. "We really felt it. ... It was like something hit the building from underneath. I actually felt an upward lift."