1,000+ Earthquakes Exposed a Canadian Volcano More DANGEROUS Than Mount St. Helens

Canada has many volcanic terrains that are hundreds, millions to billions of years old that are really important to our mining industry. But I bet you want to hear about something a little more active. Canada has almost 350 volcanoes. Two of them sit in the same threat category as Mount St Helens, and until 2024 nobody had ever ranked them. Not once. Then, under central British Columbia, seismometers picked up something they weren't built to find. A swarm. Roughly a thousand earthquakes in a matter of weeks, radiating from a single point 25 kilometres down. Not a fault. Magma. Forcing its way into the crust beneath a volcano everyone had written off as dead. Nothing erupted, but it proved the machinery under Canada is still switched on. And it raised a question the country had spent 150 years not asking. Because three years later, at 3.27 on an August morning, that question got louder. The seismic signal that night looked like an earthquake. Magnitude 2.6. But it wouldn't stop. Minutes of continuous shaking. The signature seismologists dread, because it means nothing is slipping underground. Something is moving on the surface. The south flank of Mount Meagher, an entire face of the mountain, has let go. 50 million cubic metres of rock, ice and mud pour down the valley. Enough to bury downtown Vancouver metres deep. The debris runs 13 kilometres, slams across Meagher Creek and dams it. Campers downstream are pulled out within hours. If that dam had failed at the wrong moment, a wall of water would have gone straight through them. The largest landslide in Canadian history. And here's the detail every news report missed. Meagher isn't just a crumbling mountain. It's a volcano. A live one. And it didn't even need to erupt to do this. Before this video is over, I'll tell you about the day a Canadian volcano killed more people than any natural disaster in the country's history. And why almost nobody knows it happened. Fly the coastline from Vancouver to Alaska and you're tracing the northern edge of the Pacific Ring of Fire, the belt responsible for roughly three quarters of the world's active volcanoes. The American stretch is famous. St Helens, Rainier, the Alaskan giants that ground trans-Pacific flights. Then the border. And on the maps in most people's heads, the volcanoes just stop. They don't. Geologists have catalogued 347 volcanic vents in British Columbia and the Yukon that are geologically young. Pleistocene or later. 54 of them have erupted since the last ice sheet melted. Roughly the last 11,000 years. Averaged out, that's an eruption somewhere in Canada about every two centuries. The annual odds work out to better than one in 200. For comparison, that's a higher yearly probability than the flood levels many Canadian towns are legally required to plan for. So why does nobody know? Timing, mostly. Canada's last eruptions. Lava Fork and Sea Axe Cone, both in the remote Northwest, happened in the 1800s and 1700s. Before cameras. Before seismographs. Before Confederation. There is no grainy footage. No survivor interviews. No anniversary specials. The mountains simply outlived everyone who remembered them being dangerous. Watch what that does to a country's imagination. Japan drills schoolchildren for eruptions. Iceland names its volcanoes like family members. Washington state prints lahar evacuation routes on road signs. Canada built ski resorts. One of them, you may have heard of it, is Whistler. It sits inside the Garibaldi volcanic belt, a chain of volcanoes that runs directly through the busiest mountain corridor in the country. Two million people live at the southern end of that chain. In Metro Vancouver. Hold that thought. We're coming back to that corridor. Chapter Two. The Ranking. For decades, Canada's volcano problem had a strange shape. Not danger, exactly, but ignorance. Nobody could say which volcanoes mattered because nobody had ever systematically checked. The United States had. After years of near misses, the USGS built a scoring system for its National Volcano Early Warning System. A cold, actuarial method. Every volcano gets points for its hazards. How explosively it erupted in the past. Whether it produces lahars. Whether it's covered in glaciers that can melt catastrophically. Then, points for exposure. People within reach. Aircraft overhead. Pipelines. Power lines. Ports. Hazard times exposure. Threat. In 2024, the Geological Survey of Canada published the results of running 28 Canadian volcanoes and volcanic fields through that same machinery in the Canadian Journal of Earth Sciences. The paper is dry. Tables, scores, uncertainty factors. The kind of document designed not to be quoted on the evening news. Read it anyway and it lands like a verdict. Two Canadian volcanoes score very high. The top category, shared with Mount St. Helens and Mount Rainier. They are Mount Meagre, the mountain from our cold open. And Mount Garibaldi, which rises directly above the town of Squamish. Three more score high. Mount Cayley. Mount Price. Mount Edziza. One. Silverthrone. Moderate. Now, the sentence in that paper that should have been a headline, and wasn't. The authors compared each volcano's threat level to how closely it's actually watched. International guidelines are clear. A very high threat volcano warrants dense, dedicated monitoring. Seismometers on its flanks. GPS stations measuring the ground swelling millimetre by millimetre. Gas sensors sniffing its breath. Mount Meagre, a very high threat volcano, is monitored at the level appropriate for a very low threat volcano. Every other volcano in Canada, effectively unmonitored. They sit inside a regional earthquake network of about 20 stations, spread across the entire volcanic zone. A net built to catch big tectonic quakes, not the faint whispers of rising magma. To put that in perspective, Mount St. Helens alone is watched by more dedicated instruments than every volcano in Canada combined. Chapter three. The mountain that breathes. Drive north from Pemberton and the Lillooet Valley narrows. The 2010 landslide scar is still there on Meagre's flank. A grey-brown wound you can see from the logging road, slowly greening at the edges. Get closer and the mountain does something unsettling. It steams. On the upper slopes, fumaroles vent volcanic gas through openings in the ice. In 2016, melting glaciers exposed new ones. Caves exhaling warm sulphurous air, discovered because helicopter crews noticed holes in a glacier that shouldn't have holes. Hot springs bubble along the creek below. On a cold morning, the whole drainage smokes like a battlefield. This is what dormant actually looks like up close. Not dead, idling. Meagre produced Canada's most recent major explosive eruption about 2,400 years ago, a VEI4, same explosivity class as Iceland's Eyjafjallajökull in 2010. The eruption that cancelled more than 100,000 flights and stranded 10 million passengers across Europe. Meagre's ash from that eruption has been traced across the Rockies into Alberta, 500 kilometres downwind. 24 centuries sounds like a long time. Geologically, it's a coffee break. St Helens had been quiet for 123 years before 1980. Pinatubo, before its 1991 eruption, the second largest of the 20th century, had been silent for roughly 500 years, and most people living on its slopes didn't know it was a volcano at all. And when scientists finally put sensitive instruments on Meagre, a fibre-optic cable laid across the massive, turning the ground itself into thousands of tiny sensors, they found something the regional network had never seen. Constant micro-earthquakes and long, slow tremor. The mountain murmuring to itself, below the threshold of anyone's hearing. The 2010 landslide, the fumaroles, the hidden tremor, none of it means an eruption is near. What it means is stranger. One of the two highest-threat volcanoes in the country is demonstrably active right now, in ways Canada only discovered when someone thought to listen. Which raises a question that has an uncomfortable answer. Has a Canadian volcano ever actually hurt anyone? Chapter 4. The Reveal. Northwestern British Columbia, the Nass River Valley, homeland of the Nisga'a Nation, sometime around the 1700s. The Nisga'a histories, the Adawak, oral records kept with legal precision across generations, describe how it began. Not with an explosion. With smoke in the wrong place. Fire coming down the valley of a small creek, and then a river of molten rock spreading across the valley floor, where the salmon streams ran. Two villages stood on that floor, Wee Lax Kabit and Lax Xilux. The lava came at night, by some tellings. But the histories are specific about what killed most of the people. And it wasn't the lava itself. It was the smoke. What a volcanologist today would call volcanic gases, carbon dioxide and sulfur compounds, rolling ahead of the flow. Invisible. Heavier than air. Filling the low ground where people slept. The Nisga'a record roughly 2,000 dead. Sit with that number. The Halifax explosion of 1917, the benchmark disaster in Canadian history books, killed just under 1,800 people. And it was man-made. The deadliest natural disaster in everything Canada teaches about itself is... hard to even name. A hurricane here, a heat dome there. The actual answer is a volcano. Sayak's Cone. Roughly 2,000 people in a single eruption, in what is now British Columbia. It is very likely the deadliest natural disaster in Canadian history. And it took until the 21st century for that sentence to appear in mainstream hazard planning at all. You can walk the lava bed today. It's a Nisga'a memorial park now. 39 square kilometres of black, broken rock where the valley floor used to be, the two village sites somewhere underneath. The forest still hasn't fully come back after two and a half centuries. The eruption that did this was, by global standards, small. A cinder cone. The kind of volcano textbooks call gentle. Canada's threat list has two volcanoes rated very high. Sayak's isn't one of them. Sayak's wouldn't even make the top five. Chapter 5. If it happened tomorrow. So let's do the thing emergency planners actually do. Not the disaster movie version. The realistic one, built from the published hazard scenarios for the Garibaldi Belt. Say Mount Meagre begins to stir tomorrow. Week 1. A swarm of small earthquakes under the massive, magnitudes 1 to 3. Here's the first problem. With the current network, the earliest, smallest events might simply not register. Detection thresholds in parts of the volcanic zones only reach down to around magnitudes 0 to 1 in the best covered areas. The opening notes of the overture play to an empty room. By the time the swarm is undeniable, it may have been running for days. Week 2. The quakes are now unmistakable on the regional network. And now a second problem. One no instrument can solve. No volcanologist in Canada has ever managed an eruption on Canadian soil. Not once. The playbook exists, borrowed from the US, from Iceland, but the home team would be running it for the first time live. Satellite radar gets tasked to watch the ground for swelling. Every pass over the mountain, analysts measure deformation down to millimetres, the same technique that tracked Iceland's 2,024 eruptions nearly in real time. The decision, Pemberton, population around 3,000, sits downstream. The Lillooet Valley is the drain for anything the mountain sheds, and Meagher's signature hazard isn't lava, it's lahars, volcanic debris flows. The 2010 landslide, with no eruption at all, ran 13 kilometres. A syn-eruptive lahar, with glacial meltwater feeding it, can travel at up to 80 kilometres per hour, faster than the speed limit on most of the roads people would use to flee. And published worst-case scenarios for Meagher reach tens of kilometres down valley. The evacuation call has to come before certainty exists. It always does, if it erupts. A repeat of the 2,400-year-old event, an ash column into the jet stream, Vancouver International sits downwind of the belt under many wind patterns, an airport that moves roughly 26 million passengers a year, the second busiest in the country. Eyjafjallajökull, the same size class, cost airlines an estimated $1.7 billion in a week. Ash doesn't need to bury a city to break it. A few millimetres shorts out substations, clogs water treatment, and grounds every aircraft within hundreds of kilometres. And if it doesn't erupt, which is the most likely outcome of any unrest, Canada still faces weeks of a question it has never had to answer in public. How close is too close to a restless volcano you barely monitor? None of this is prophecy. Every element is on the record. The detection gaps, the lahar speeds, the ash scenarios, the inexperience. Tomorrow is simply when the invoice arrives for decades of not looking. There's a small office in Vancouver where, for years, watching Canada's volcanoes was very nearly one person's job. Melanie Kelman, a volcanologist with the Geological Survey of Canada, co-authored the 2024 Threat Ranking. She spent years focused on Garibaldi and Cayley, the two big stratovolcanoes within 150 kilometres of Vancouver. Her working reality says everything about the field. A country with 347 young vents has had, at times, a volcanology staff you could fit in a minivan. The scientific literature on entire Canadian volcanic fields sometimes amounts to a handful of papers, several of them decades old. And yet, quietly, the picture is changing faster right now than at any point in Canadian history. The 2010 meagre landslide put the mountain on the front page. The 2007 Nazca earthquake swarm, a thousand small quakes in central BC as magma shoved into the crust 25 kilometres down, the closest thing to volcanic unrest modern Canada has recorded, proved the machinery under the province is still switched on. Nothing erupted, but for a few weeks seismologists in Ottawa and Vancouver were watching a Canadian magma body move in real time and taking notes. Then the 2024 ranking gave all of it a spine, a priority list. Since then, a multi-year volcano risk reduction project has been building the things Canada skipped for a century. Hazard maps for Garibaldi and Meagher, modelled lava and lahar run-out zones for Squamish, an operational satellite defamation system tested against live Icelandic eruptions. There's even talk in planning documents of volcanic hazard zones shaping where towns can build, the way floodplains already do. Down in Squamish, life continues at the foot of a very high-threat volcano, the way it always has. 20,000 people, a climbing gym, a Saturday market, the chief towering over the highway. Ask around town about Nke, Garibaldi's Squamish name, Dirty Place or Grimy One, for the ash-muddied waters of its past, and you'll find the Squamish nation never actually forgot what the mountain is. Their histories describe it as a place of refuge during the Great Flood and a mountain that burns. The knowledge was always there. It was on the land and in the adawak and in the steam on Meagher's flank. For about 150 years, the newcomers just didn't ask. Now the instruments are finally going in, the maps are being drawn, and somewhere under the ice of the coast mountains, at a depth no seismometer in the current network can hear, the next chapter of this story is already being written. It has been roughly 2,400 years since Mount Meagher last erupted. Pinatubo weighted 500. St. Helens, 123. The mountain is still breathing.