[Updated at 5:20 p.m.] U.S. Geological Survey has revised the earthquake's preliminary magnitude to 5.0. The USGS initially assigned it a preliminary magnitude of 5.5.
[Updated at 2:55 p.m.] There has been no major damage reported so far from an earthquake that hit Canada today, the city of Toronto said in a press release.
"In our initial assessment, there has been no major damage to City infrastructure. Further investigations are taking place to confirm," the statement said. "The Toronto Transit Commission and Transportation Services have reported that there has been no damage to their infrastructure or interruptions to service.
"The City’s Emergency Operations Centre is up and running in preparation for the G20 so the City is uniquely prepared to respond to the event. We will continue to monitor the situation and will report as necessary."
iReport: Are you there? Share earthquake images, video
[Updated at 2:42 p.m.] Barre Campbell, a spokesman for the city of Ottawa, tells CNN that there are no reports of major damage in downtown Ottawa.Campbell said he witnessed self-evacuations of downtown buildings, but that people appear to be headed back into work buildings now.
[Updated at 2:32 p.m.] An operator at the Ottawa Hospital said she felt the quake for about 30 seconds.
Sgt. Marc LaPorte, a spokesman for the Royal Canadian Mounted Police, told CNN that it was a "slight tremor" and there "doesn't appear to be any damage reported to date yet."
[Updated at 2:21 p.m.] CNN affiliate CBC in Canada is reporting that buildings in Toronto and Ottawa have been evacuated.
CBC also spoke with Kathleen Sullivan who was working on the eighth floor of an office in downtown Toronto when the quake hit.
"It was very peculiar because we could actually see the plants on our window shelf shaking," she told the CBC. "By the time we gathered in the hall and figured out it wasn't our imagination, it stopped. But it was easily a minute of things shaking.
[Updatd at 2:16 p.m.] The quake struck at 1:41 p.m. near the borders of Ontario and Quebec provinces, the USGS said.
It was about 12 miles deep.
[Updated at 2:15 p.m.] CNN affiliate WDIV in Detroit, Michigan is reporting tremors were felt in the metro area of Detroit.
Other tremors have reportedly been felt in New York, New Jersey, Connecticut and Cleveland, Ohio.
CNN affiliate WFSB in Hartford, Connecticut reported that some residents in Connecticut felt shaking. CNN affiliate WMUR in Manchester, New Hampshire reported that residents in New Hampshire also felt the tremors.
[Posted at 2:10 p.m.] An earthquake with a preliminary magnitude of 5.5 struck Wednesday in southern Canada, the U.S. Geological Survey reported Wednesday.
This story is developing. We'll bring you the latest information as we get it.
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We live about 50 miles directly due south of the quake area; we felt it here for almost 30 seconds. Oddly; happened to be watching CNN at the time. There was definite "wave action" ; like in a pool with vertical movement too. The funny thing is we have a lot of road construction here ; and "tremors" are somewhat normal ; lasting maybe 5 seconds at a time... this "one" felt like their blew up the entire area. No damage to house ; a few things fell ; that is about it. I had to time to realize this was no normal "road work" ; get up and walk outside - it was going on the entire time. My dogs were freaked bigtime.
Felt it over here in J.P, Boston MA. I was sitting in my car for lunch when I felt it shaking. Thought it was the wind at first but there was barely a breeze. Felt it for like 10-15 secs.
Sorry about that! My fault, my fault. I tripped on a harp!
Felt it here in Buffalo, New York also. Our office chairs were bouncing up and down and the pictures were banging against the wall. People in the elevators also said they were swaying back and forth.
it was realy scary i wason my computer and all of a sudden it started shacking and i thought there was a truck driving passed my house !
I live in North Bay Ont. I was sooooo scared and my brother and i were hom alone i started frecking out!
Don't worry, Its just Quebec trying to separate from Canada again. Only this time they are digging a tunnel.
Was told it was felt in central MI area.
Didn't feel it in Williston, VT no clue why but several surrounding areas did.
Shook dresser, vibrated picture to edge of it, mirror on wall danced in Lindsay ON Canada. Twice for mere seconds with short interval inbetween
I felt it in a van down by the river. Milw, WI.
We did not feel it in Monett, MO.
Felt in Columbus, Ohio
Its Nature's way of hating on the G8/G20.
Why would CNN report what is going on in Toronto if the quake happened near Ottawa? We have more than 1 city in what we call provinces. It's like if a quake happens in LA do you think our news agencies are checking in on Colorado?
Grimsby ontario 35km north of Niagara Falls southwest of Toronto 70km just down the road from hamilton ont . Felt it for about 12-18 seconds very weird . floor shook while i was making lunch. plates in shelfs rattled . an apple on my counter rolled a couple of inches. No damage done just weird so many earthquakes this year!??