An early morning earthquake measuring 4.1 in intensity rattled nerves from Williams to Gold Beach to south of Coos Bay Thursday.

The USGS reported the earthquake at 1:52 a.m. with an epicenter 23 miles below ground about 30 miles west-northwest of Grants Pass. According to USGS Web sites, it was most strongly felt in a cluster around Grants Pass from Glendale to Williams and Rogue River. Reports also came in from Brookings, Gold Beach and Coquille.

The epicenter was in a remote mountainous area of few residents. No damage or injuries have been reported.

Darla Day of Merlin said she woke at about 2 a.m. to rumbling and then a powerful slam that she said "felt like a Mack truck hit the house." But she said others she spoke to weren't disturbed by the event at all, common in earthquakes where how it feels depends on location and the type of soil and rock in the area.

"I felt it rumbling and then -- Bam!" she said in a phone call to KTVL to find out if there was a quake.

As of about 9:30 a.m., 86 people had logged onto the USGS's "Did You Feel It" site to report their experience.