Officials say a magnitude 4.2 earthquake that struck near Buffalo, N.Y., Monday morning was "lightly" felt in southern Ontario.
Natural Resources Canada said there are currently no reports of damage and none should be expected following the event.
The federal government's seismogram viewer shows the quake occurred at 6:15 a.m.
Earthquakes Canada said the shockwave originated six kilometers east of Buffalo, New York, 97 kilometers east southeast of Hamilton, Ontario, and 101 kilometers southeast of Toronto.
Seismologist Yaareb Altaweel told the Associated Press that it was the strongest earthquake in Buffalo in at least 40 years.
Stephen Halchuk, a seismologist with Natural Resources Canada, said that while earthquakes at the western end of Lake Ontario and the eastern end of Lake Erie are common, today's was "a little larger" than normal.
"This low-level scattered activity is happening all the time. Most of the earthquakes that occur in this region are too small for people to notice."
"But today's event was only slightly larger and was felt as a strong, but short-lived jolt by people in southern Ontario and upstate New York," Halchuk said.
Halchuk explained that because southwestern Ontario is located in the middle of the North American tectonic plate, and not on a plate boundary like California, for example, earthquakes in the area are rarely powerful enough to create significant damage.