A magnitude-6.4 earthquake was reported off Canada's Pacific coast Friday afternoon. There were no immediate reports of damage, and no tsunami warning was issued.
The Pacific Tsunami Warning Center said there was "no destructive widespread tsunami threat," but it warned authorities to expect local tidal swells.
The CBC reported that buildings swayed for an extended period from the Fraser Valley to Campbell River.
Hon Sung, who runs the Gold River Chalet on Vancouver Island, told NBC News it was the largest quake he had felt in the seven years he has lived in Gold River, about 30 miles from the epicenter. The shaking lasted 10 to 15 seconds, but the furniture didn't move and items didn't fall off the shelves, he said.
The quake was felt in many areas of Washington State and as far away as San Francisco, the USGS said. Firefighters in Comox, British Columbia, about 200 miles from Gold River, noticed rolling and shaking of light fixtures, NBC News reported.
Bridget Hughes, a marketing analyst for Microsoft Corp., felt the quake in the Seattle area, writing on Facebook: "Yay for being on the 23rd floor during an earthquake. Now I know what morning sickness feels like."
Online message groups buzzed as commenters reported what they had felt. "It was scary but awesome real slow movements im shaking still," one wrote.
By Alex Johnson of msnbc.com. Norma Rubio of NBC News contributed to this report.