Early earthquake warning system launched in Quebec, eastern Ontario

OttawaA network of sensors that can provide crucial seconds notice of a possibly serious earthquake is now up and running in Quebec and eastern Ontario.Phone, broadcast alerts could arrive several seconds before shaking beginsCBC News · Posted: Nov 28, 2025 12:23 PM EST | Last Updated: 1 hour agoListen to this articleEstimated 2 minutesThe audio version of this article is generated by text-to-speech, a technology based on artificial intelligence.Alerts like this will now pop up on your phone if a potentially serious earthquake is detected in Quebec or eastern Ontario. (Gian Paolo Mendoza/CBC)A network of sensors that can provide crucial notice of a potentially serious earthquake is now up and running in Quebec and eastern Ontario.Natural Resources Canada (NRC) announced the expansion of the Earthquake Early Warning System on Thursday.If an earthquake of magnitude five or higher is detected, the system kicks into action and transmits emergency phone and broadcast alerts similar to those for tornadoes or Amber Alerts.Those alerts could give several seconds of warning of before the shaking begins, allowing people time to take shelter and protect themselves.The department said it’s also working on warning specific sectors so trains could be held, surgeries paused and bridges or tunnels closed, for example.Along with western B.C., where the warning system was launched last year, NRC said eastern Ontario and southern Quebec are at moderate to high risk of earthquakes.A major earthquake in such urban environments could cause tens of billions of dollars worth of damage, NRC said.One earthquake above magnitude five has been recorded in Canada this year, according to Earthquakes Canada: a magnitude 5.2 off the coast of the Northwest Territories last month.This region has recorded only three of that strength this century, in 2002, 2010 and 2013.P and S wavesAs the government explains it, the sensors first detect the initial deep energy radiating from an earthquake, known as the primary or P wave. If it has the potential to cause damage, an alert is transmitted before secondary or S waves hit and cause damage.In B.C. for example, the P waves of a quake about 600 kilometres away were detected about a minute before the S waves arrived.People closer to a quake’s epicentre may not get an alert in time, however.WATCH | When and why these alerts go out:Why you might not get an earthquake alert during an emergencySouthwestern British Columbia has experienced several small but noticeable earthquakes over the past few weeks. For some it’s raising questions about how to be better prepared. CBC’s Baneet Braich looked into the Earthquake Early Warning system and how to better ensure it works for you.