Massive Earthquake in Canada Sends Tremors Across Multiple US States: What You Need to Know

A powerful earthquake shook the southern regions of Canada while also sending tremors throughout several U.S. states near the northern border.

This seismic activity, measured at a magnitude of 4.0, occurred at 12:36 p.m. ET on Tuesday, approximately 40 miles north of Ottawa, Ontario—a bustling city home to over 1.1 million residents.

The U.S. Geological Survey (USGS) reported that the quake’s vibrations extended to multiple nearby urban areas, including Montreal, which boasts a population of 4.4 million, as well as into northeastern U.S. states like New York and Vermont.

Earthquakes Canada, the Canadian equivalent of the USGS, verified that the earthquake sent seismic waves over a 300-mile-wide region, prompting thousands to report experiencing mild to moderate tremors.

The agency noted that while quakes of this intensity are typically felt throughout the area, they seldom result in serious damage.

A resident in Ottawa’s Constance Bay told CTV News: ‘The building was vibrating and it sounded like a large truck was going by at the beginning. It increased to where we felt the vibration in buildings.’

‘The house was shaking and it scared us,’ another person in Quebec’s Otter Lake area added.

There have been no reports of injuries at this time. 

The US Geological Survey detected a large quake in southern Canada, with shockwaves reaching upstate New York, Vermont, Montreal and Ottawa

Ottawa is just 40 miles from the quake’s epicenter and is home more than 1.1 million people

Canadian officials have reported that the quake was slightly weaker than what US monitoring stations have said, calling Tuesday’s event a 3.9 magnitude tremor.

Canada’s National Capital Region, which includes the provinces of Ontario and Quebec, has not suffered an earthquake stronger than magnitude 5.6 since officials in the country started keeping accurate seismic records after 1899.

That record-setting earthquake struck both Cornwall, Ontario and Massena, New York in the US in 1944. A pair of Canadian quakes in 2010 and 2013 were measured at around magnitude 5.0.

Tuesday’s earthquake struck in the heart of one of the most active seismic zones in eastern Canada.

The Western Quebec Seismic Zone includes a massive swath of land, including the Ottawa Valley from Montreal to the city of Temiscaming.

The Laurentian Mountains and Eastern Ontario are also part of this seismic zone, covering cities such as Ottawa and Cornwall.

This zone regularly produces small to moderate earthquakes and is the main source of seismic hazards for Ottawa, Gatineau and nearby areas.

The shaking happens because the ground here has several ancient faults below the surface, and ongoing pressure from deep inside the Earth keeps pushing on them, causing these cracks to occasionally slip and release energy. 

Reports of shaking were made across southern Canada, including Montreal (Right) which has a population of more than 4 million people

Pictured: Canada’s Western Quebec Seismic Zone

There has been widespread seismic activity throughout North America this week, from the Pacific Northwest to the Northeast.

On Sunday, a swarm of 18 earthquakes was detected right off the coast of Washington State, including a magnitude 4.2 eruption in the Pacific Ocean.

The swarm took place right along the Cascadia Subduction Zone, an ancient ‘subduction’ zone where a tectonic plate slides underneath the North American plate.

Geologists fear this region could be ‘overdue’ for a massive earthquake stronger than magnitude 7.0.

On Monday, a strong magnitude 5.7 earthquake was felt in Western Nevada and set off a swarm of aftershocks in the area.

Multiple earthquakes in Silver Lake can be caused by several factors, but the most common reason is movement along faults, which are fractures in the Earth’s crust where blocks of rock slip past each other, just like in Canada.